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4 b0 \1 n, o5 N- |6 oScope and Purpose范围和目的 The NET1 function in 3D SPACE mode is used to create, deform and smooth surfaces called nets. 3D SPACE模式下的NET1功能用来生成、改变和光顺用surface命名的nets面。
; O5 u# c- C! jBasic Concepts基本概念 Nets are defined by a biparametric network of nodes (IU, IV) Nets由双等参节点网络（IU，IV）定义。 Each node comprises 6 values or node conditions: 每个节点由6个数值组成或节点的条件如下： 。a point 。a tangent in the u direction 。a tangent in the v direction 。a curvature (vector) in the u direction 。a curvature (vector) in the v direction 。a correcting factor affecting the interior of the net patches called the crossed double derivative. . 点 . 在U方向切矢连续 . 在V方向切矢连续 . 在U方向曲率连续(垂直) . 在V方向曲率连续(垂直) . 被称作交叉的两派生net面片的正确的内部影响因素 The equivalent surface is inferred from this network of values. The end points of the surface patches are the nodes which respect the corresponding tangents and curvatures. 相等的surface由评估网络指出, surface面片的终点是与相应的切矢和曲率有关节点。 2 s% ~7 v2 L8 A4 Y' I$ d1 U% o$ d7 h
Characteristics and Possibilities特点和可能性 The defined surfaces have: 定义surfaces有： 。tangent continuity at all points, 。curvature continuity along the patch limits called "definition isoparametrics". 。所有点切矢连续 。沿叫做“定义等参线”的曲面片边界曲率连续
/ g/ T% n2 L3 HChanging a node condition only modifies the patches that have the corresponding node as one of their end points. 改变节点条件只修改与任何一个终点有相关节点的曲面片
" ], F) j. q+ U+ G! D, [Refer to "Influence of Each Node Condition on the Surface" on page 63. 在63页指出了”在Surface上每一个节点条件的影响”。 Therefore a net can be modified locally by changing one or more node conditions. 因此一个net曲面片能够通过改变一个或多个控制点被局部修改。 With the exception of the crossed double derivative, these conditions are very explicit as they are intrinsic values (independent of any parameterization and the other points). 除两个派生面重叠部分外，这些条件是非常明确的，因为它们具有内在的固有特性（即任何等参线和其它点相互独立）。 Notes: If a non-isotropic transformation is applied to a NET, the equivalent surface of the resulting NET may not be the exact transformation of the equivalent surface of the original NET. In such a case, the NET transformation is approximate. 注：如果一个非独立转换应用到面上，那么最终NET的等价曲面就不会正确地被初始NET的等价曲面转换。由此看来，NET转换是近似的。 3 D+ b4 F% O, F* c( R5 A8 k) `
Function Menus功能菜单 The NET1 function in 3D SPACE mode contains nine menus: 3D SPACE下的NET1模式由9个菜单组成 Menu 2 is activated by selecting the DEFORM item. 菜单2通过选择DEFORM条激活 Menu 3 is activated by selecting the DEFORM + ISOPARAM items. 菜单3通过选择DEFORM+ISOPARAM条激活 Menu 4 is activated by selecting the SMOOTH item. 菜单4通过选择SMOOTH条激活 Menu 5 is displayed in the SMOOTH + POINTS items after the first interaction. 菜单5在第一次交互作用后由SMOOTH+POINTS条显示 Menu 6 is displayed in the SMOOTH + POINTS + SINGLE items, after selecting the blinking symbol representing the point to free it. 菜单6由 SMOOTH+POINTS+ SINGLE条显示,在选择高亮度符号象征的点之后,释放它 Menu 7 is displayed in the SMOOTH + POINTS + MULTI or GLOBAL items, after selecting the blinking symbol representing the point, to free all nodes of the previously defined zone. 菜单7由SMOOTH+POINTS+MULTI或GLOBAL条显示,在选择用高亮度符号象征的点之后,释放所有以前被定义区域内的节点 Menus 8 and 9 are displayed in the VISUALTN item after the first interaction. 菜单8和9在第一次交互作用之后,在VISUALTN条内显示
$ O& E/ ~. E0 [% kIf a node condition is free, the program is authorized to optimize it during smoothing operations or neighboring major deformations. 如果一个节点条件被释放,程序被授权在光顺操作或附近主要变形过程中优化它. + q+ o0 R/ [! l6 X- a" e- A* {; r
When nets are created, the conditions present on the definition elements (attributes of CST type elements, curvatures and tangents present on the CCV, the values present on the surfaces to be approximated, and so forth) are imposed. The missing conditions are initialized by the program and are free. Thereafter, any node condition modified by the user is imposed. 当NET面被生成,在定义元素上呈现出的条件(CST型元素的特征,切矢和曲率都呈现在CCV上,呈现在曲面片上的数值被近似,等等)被施加.缺省的条件已被程序初始化并释放之.其后,任何被用户修改的节点条件都被施加.
. Y4 G# S8 u& M2 b. X) y# JHowever, before a smoothing operation, users can free or impose values as they wish. 然而,光顺操作之前,用户能根据他们的希望释放或施加数值. . Y+ J. q8 G7 P" O- h4 P
Symbols Used to Help in the Dialog在对话框中用于帮助的标记
9 @% Z, X( r. H% i2 Q% E- U) C Display the node conditions 显示节点条件 A node condition is displayed by: 一个节点条件被显示: Figure 31. Symbol displayed for node condition图片31.节点条件的符号显示 ．a symbol (1) for the point .符号(1)适合于点 ．two arrows (2) for the two tangents .两个箭头(2)适合于两个切矢 ．two circular arcs (3) for the two curvatures. When the curvature is equal to zero, the symbol is 0. .两圆弧(3)适合于两个曲率.当曲率等于零,标记是0. The crossed double derivative is not displayed. 交叉的两个派生面不被显示.
: ] G1 t5 N& C) ^Current net and direction symbol 当前的NET面和方向标记 4 k7 G# F/ T2 d+ b& a
The current net is the one on which the user is working. 当前的NET是用户正在使用的 $ w# R, v, Q8 z7 [, H! U
When any item is selected, the first interaction is to choose the current net. Once selected, a symbol is displayed indicating the direction and orientation of the u and v. 当选择了任何一个工具条时,最先相互作用的是选当前NET面.每选择一次, 显示一个标记,它指出了U和V的方向和定位.
$ K8 t5 x, Y1 y: h: \7 O* r/ _This symbol can be removed by selecting it. (However, its display is required in the DEFORM + ORIENTN items). 这个标记能通过选定它来移动（然而，它需要在DEFORM+ORIENTN工具条下显示）。 $ @/ @! t, k0 v F$ c3 m
If, in the DEFORM or SMOOTH item, the user changes item in menu 2 or 4, the current net remains unchanged. In this case, the NO key can be used to refuse the current net and a new selection is proposed. 在DEFORM或SMOOTH工具条下，如果用户在第2或第4菜单下改变工具条，当前的net面余下部分不会更改。例如，NO键能用来拒绝当前的net面并且会提出新的选择。
" E4 r$ z& k9 L4 C6 g5 wHowever, the current net is not kept if any of the other items in menu 1 are selected. 然而，当选择了菜单1中的其他工具条，前net面不会保留。
' }6 ~2 [3 @+ ]5 i! J2 `7 QKeying in a node or isoparametric 键入一个节点或等参线 The user may select a node (or an isoparametric, depending on the item used) by keyboard entry. 用户可以通过键盘输入选择一个节点(或依附于正在使用的工具条一个等参线) Examples例 ．To select the node whose rank is 4 along u and 3 along v, the user must key in: 4,3 .选择一个节点,它的行列值是沿U方向为4,沿V方向为3,用户可以键入:4,3 ．To select the "iso-v" isoparametric whose rank is 2 along v, the user must key in: 0,2 .选择”iso-V”等参线,它的数值沿V方向是2,用户可意见如:0,2 ．To select the "iso-u" isoparametric whose rank is 5 along u, the user must key in: 5,0 .选择”iso-U”等参线,它的数值沿U方向是5,用户可意见如:5,0
9 U6 H( U: [% f* NKeying in a node condition 键入节点条件 In all cases, providing there is no ambiguity, the user can select a node condition by keyboard entry. This avoids the selection on the screen of the graphic symbols representing the node conditions, which can occasionally be difficult. 在任何情况下,都没有模棱两可的提供方式,用户能通过键盘输入选择一个节点条件。这就避免了选择在几何标记的屏幕上表现出的节点条件，这时而很困难。 The various keyboard entries are as follows: 下面是各种不同的键盘输入： ．PT for the point .PT表示点 ．TU for the tangent along U .TU表示U方向切矢 ．CU for the curvature along U .CU表示U方向曲率 ．TV for the tangent along V .TV表示V方向切矢 ．CV for the curvature along V .CV表示V方向曲率 ．XD for the crossed double derivative (XD being short for XDBL DER). ．XD表示交叉的两派生面(XD是XDBL DER的缩写) " S4 T+ U; b- K$ k7 e7 o9 |* y
Triangular Ｐatches 三角形曲面片 Triangular patches (that is, patches having two common limit points) may be created and used in the NET1 function. These patches may be created using the CREATE, DEFORM or APPROXIM item (for example, sphere approximation). Triangular Ｐatches(指的是有两个共同边界点的面片)可以在NET1功能下生成和使用。这些曲面片可以用CREATE、DEFORM或 APPROXIM工具条生成（例如，近似的球体） 7 O4 W7 s! y0 c
Tangent continuity at all points and curvature continuity at the nodes is kept on this type of net. 这种net面的所有点切矢连续和所有节点曲率连续。
; [& o- _2 q3 {; uCCV SelectionCCV的选择 Each time a CCV (composite curve) is selected, the program uses the local values (points, tangents, curvatures) at the arc ends. The resulting net isoparametric will be the same as the selected CCV only if it is a spline2. 每次选择一条CCV（合成曲线）后，程序在arc线终点使用本地数值(点、切矢、曲率)。仅当等参线是spline2曲线是，作为结果的网状等参线与被选定的CCV曲线相同。 9 N4 M. {$ G9 ~+ j
Recommendations for Use 使用说明 The procedure generally followed when the NET1 function is used is: 在NET1功能使用时，通常的程序是： Creating the net from 从下列几项生成net ： ．a series of single-parameter elements (CST or CCV) (CREATE item). . 单变量的系列元素(CST或CCV)(CREATE工具条). ．or a dual-parameter element (SURFACE) or its restriction (FACE) (APPROXIM item). . 双变量元素(SURFACE)或约束(FACE)(APPROXIM工具条).
8 C& Z/ W) V( E, h! z% n5 | Local modifications (DEFORM item). 局部的修改(DEFORM工具条). ．modification of local parameters. . 局部等参线的修改. ．local projection onto a surface. . 在曲面上的局部投影. ．net extension . 延展 net面. ．taking a tangent or curvature comb from another net. . 用切矢和曲率与另一个net面合并. % c v7 ~; `: a7 k$ H# B3 Z
Smoothing construction isoparametrics (SMOOTH item). Smoothing the whole NET with or without freeing points (SMOOTH + POINTS items) 光顺结构的等参线(SMOOTH工具条).光顺整个NET面用或不用释放点(SMOOTH+POINTS工具条)
1 T7 ^- R+ ?: s' W6 SSmoothing the interior of the net patches (SMOOTH + XDBL DER items) 光顺NET曲面片的内部(SMOOTH+XDBL DER工具条) & [: ]% |2 P/ i
Rapid and overall tangent connection of a NET type element on one or more NET or SURFACE type elements 在一个或多个NET或SURFACE型元素上快速和全面使NET型元素的连接面相切
: Z. w3 w c1 z" Q# C2 O Surface transformation if faces are to be created (SURFACE item). 如果生成表面则用曲面转换(SURFACE工具条). - @! l a, Q3 s @; d0 o2 z( I
Real Time Analysis 实时分析 Real time analysis functionalities and analysis windows are available in this function. 实时分析功能和分析窗口在此功能非常有用。
; S' F) l B" u; f3 F* }& jInfluence of Each Node Condition on the Surface 在SURFACE曲面上每个节点条件的影响
/ I! }' {( _7 z _8 gInfluence of the point 点的影响 Changing the point value modifies the four isoparametric arcs coming from this point. It also influences the four patches of which it is one of the end points. 改变点的数值会修改来自这个点的四条等参arc线。它还影响到四个patche面，该点是的一个终点。 Influence of the tangent 切矢的影响 Changing the tangent value modifies the two isoparametric arcs corresponding to its direction. It also influences the four adjacent patches. 改变切矢的数值会修改两条相应方向上的等参arc线。它还影响四个相邻近的patche面。 Influence of the curvature 曲率的影响 Changing the curvature value modifies the two isoparametric arcs corresponding to its direction. It also influences the four adjacent patches. 改变曲率数值会修改两条相应方向上的等参arc线。它还影响四个相邻近的patche面。 Influence of the crossed double derivative 交叉的两派生面的影响 Changing the crossed double derivative value does not modify the isoparametrics. It modifies only the interior of the four adjacent patches. 改变交叉的两派生面的数值不会修改等参线，只能修改四个相邻近的patche面内部。 Node conditions on the tangent comb between two nodes 两节点间切线的三个矢量上的节点条件 The tangent comb between two nodes is entirely defined by: 两节点间切线的矢量完全有下面定义： ．the two corresponding points .两相应的点 ．the two tangents and the two longitudinal curvatures .两切线和两纵向的曲率 ．the two transverse tangents .两横向的切线 ．the two corresponding crossed double derivatives.
% \# ?0 b, v8 ]) {. h/ F" n4 wCREATE Create a net 生成一个net网面 1 Select a CST or CCV type element. 1 选一个CST 或 CCV型元素 A temporary CST type element is displayed. 显示一个临时的CST型元素 2 Select another CST or CCV type element. 2 选另一个CST 或 CCV型元素 /or/ 或 2 Select a temporary CST type element to change the direction of the data. 2 选一个临时的CST型元素改变数据的方向 3 Press the YES key to create a NET type element. 3 按YES键生成一个NET型元素 4 n. _' p* \3 u) v+ M6 ~
Notes: 1．A net that is linked to specific applications or that does not belong to the current set can not be deformed. 2．A comparison NET, with NO-PICK color, is displayed when the first deformation is performed. It represents the NET in its original state. ! ?& f* T1 ]! {+ y* h8 e9 ~
注: 1．不能更改一个与特殊应用软件相联系或不属于当前集的网面 ２．当执行了第一次更改时，会显示具有NO-PICK（不可选）颜色的对照NET网面． Note: A net that is linked to specific applications or that does not belong to the current set can not be deformed. 注意事项： 不能更改一个与特殊应用软件相联系或不属于当前集的网面．
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DEFORM 改变形状 Deform a net 改变一个网面 Menu 2 is displayed. 菜单２会被显示 Note: A net that is logically linked to specific applications or does not belong to the current set can not be deformed. 注：一个与特殊应用程序有逻辑联系或不属于当前集的网面会被改变形状． DEFORM + NODE Deform a net at a node by modifying this point, or a tangent, or a curvature 通过修改这个节点的点，切矢，曲率，改变ＮＥＴ网面的形状 Select the NET to be modified 选被修改的ＮＥＴ网面 1 Select a NET type element. Five graphic symbols are displayed at the net node nearest to the selected zone. These five symbols are as follows: ．a symbol for the point ．two arrows for the two tangents ．two circular arcs for the two curvatures. When the curvature is equal to zero, the symbol is 0. The point (displayed blinking) is the current node condition to be modified. １选一个ＮＥＴ型元素 在距所选区域最近的网面节点会显示五个标识符 这五个标识符如下： ．一个表示点的符号 ．表示两个切矢的两个箭头 ．表示两个曲率的两个圆弧 当曲率等于零时，标识符为０． 闪亮显示的点是当前被修改的节点条件． Change the current node condition 改变当前的节点条件 2 If required, select another node condition to be modified. This condition becomes the current condition to be modified and is displayed in blinking mode. If no node condition blinks, the crossed double derivative is the current node condition. ２ 如果需要，选择另一个节点条件修改． 控制条件成为当前被修改的控制条件并且以闪亮的方式显示． 如果没有控制条件闪亮，交叉的双派生面是当前节点条件． Ｎotes: 1．Any modified node condition remains imposed for a subsequent smoothing or deforming operation. ２．At any time, the user may: ．change node by selecting another net node, ．change the node condition by selecting another symbol. 注： １．任何被修改的节点条件，仍然会对后来的光顺或变形操作施加影响 ２．任何时候，用户都可以： ．通过选择另外的网面节点改变节点， ．通过选择另外的符号改变节点条件． Modify the current node condition 修改当前节点条件 The point is the current node condition 该点为当前的节点条件 3 Select a PT type element. ３选择一个ＰＴ点型元素． /or/ 3 Key in the coordinates of the new point to be created. The node is transferred to this new point. ／或／ ３键入生成的新点的坐标 节点被传到这个新点 /or/ 3 Select a SUR or NET type element. The current node is projected onto the selected surface. ／或／ ３选择一个ＳＵＲ或ＮＥＴ型元素． 当前节点被投影到被选曲面上． /or/ 3 Press the YES key. ／或／ ３按下ＹＥＳ键． The crossed double derivative becomes the current node condition. 交叉的两派生面变成了当前节点状态 A tangent is the current node condition 一个切线是当前的节点条件 3 Select a PT type element to define the new tangent direction. ３选择一个ＰＴ点型元素定义新的切矢方向 /or/ 3 Select an LN type element to define the new tangent direction. ／或／ ３选择一个ＬＮ线型元素定义新的切矢方向 /or/ 3 Key in the components of the new tangent direction. ／或／ ３键入新的切矢方向的构成条件 /or/ 3 Select a SUR or NET type element. The current tangent is projected onto the selected surface. ／或／ ３选择一个ＳＵＲ或ＮＥＴ型元素． 当前的切线被投影到被选曲面上． A curvature is the current node condition 一个曲率是当前的节点条件 3 Select a PT type element. The new circle of curvature passes thro ugh this point. ３选择一个ＰＴ点型元素 /or/ 3 Select an LN type element to define the new normal direction. ／或／ ３选择一个ＬＮ线型元素定义这个新的垂直方向． /or/ 3 Key in the components of the new normal direction. ／或／ ３键入新的垂直方向的构成条件 /or/ 3 Key in the desired radius of curvature. ／或／ ３键入想要的曲率半径 The crossed double derivative is the current node condition. 交叉的两派生面是当前的节点条件 Since the crossed double derivative is a correcting factor, it is very difficult to determine a suitable value. 由于交叉的两派生面是一个确切的因素，因此决定合适的数值非常困难 A point is displayed such that its position with respect to the node point indicates the influence of the crossed double derivative on the positive UV zones (reverse influence on the UV negative zones). The components of this point in the local axis system (TU, TV, N) are displayed in the keyboard entry zone of the screen. 一个点被显示，对这个节点而言，该点的位置指明了在ＵＶ正向区域内对交叉的两派生面的影响（在ＵＶ反向区域有相反的影响）．在本地坐标系（TU,TV,N）点的组成部分在屏幕的键盘输入区域显示。 3 Press the YES key to cancel the crossed double derivative. ３按下ＹＥＳ键取消交叉的两派生面． /or/ 3 Select a PT type element which becomes the new influence indicating point. ／或／ ３选择一个ＰＴ点型元素，它成为新的影响指示点 /or/ 3 Key in the new coordinates in the local axis system. ／或／ ３在本地坐标系键入新坐标 DEFORM + ISOPARAMModify the NET by adding, deleting or modifying an isoparametric 通过添加，删除或修改一个等参线来修改ＮＥＴ面 Menu 3 is displayed. 菜单３被显示 DEFORM + ISOPARAM + ADDAdd an isoparametric curve to a net 添加一个等参曲线给一个网面 If required, choose the current net 如果需要，选当前网面 1 Select a NET type element. １选一个ＮＥＴ元素 The program displays circle symbols and each net boundary (represented by a number). Thus the user can add an isoparametric. 程序显示圆的符号和每个网面边界（由一个数字代表）．这样用户能够添加等参线． Add one or two isoparametrics 添加一条或多条等参线 By extending a boundary or inside the existing NET 通过延伸一个边界或在存在的NET网面内部 2 Select a number on one of the net boundaries to extend the net outwards. ２选择在网面的一个边界上一个数字向外延伸网面． /or/ 2 If required, select another point inside the NET. The isoparametric to be inserted will pass thro UGh the selected point. ／或／ ２如果需要，选择ＮＥＴ网面内的另一个点。被插入的等参线将通过所选的点。 3 Press the YES key to confirm that the curve is to be added where the symbols are displayed. ３按下ＹＥＳ键确定曲线已被添加到符号显示的位置。 4 Select a CST type element that has as many nodes as there are circle symbols. ４选择一个ＣＳＴ型元素，与许多节点一样，提示圆的符号。 /or/ 4 Select a CCV type element that has as many arc ends as there are circle symbols. ／或／ ４选择一个ＣＣＶ型元素，与许多ａｒｃ曲线终点一样，提示圆的符号。 /or/ 4 Select an isoparametric belonging to another net that has as many nodes as there are circle symbols. ／或／ ４选择一条属于另一个网面的等参线，与许多节点一样，提示圆的符号。 By selecting a point 通过选一个点 2 Indicate a point or select a PT type element to be projected onto the net. Two arrows are displayed at the selected point. ２指出一点或选择一个ＰＴ点型元素投影到网面上。 两个箭头在被选择的点上显示。 3 Press the YES key to confirm that both isoparametrics are to be added at the selected point. ３按下ＹＥＳ键确定两条等参线都已被添加到所选定的点上。 /or/ 3 Select the arrow corresponding to the desired isoparametric. The created net passes through the selected isoparametric(s). ／或／ ３选择与想要等参线相应的箭头。生成的网面通过所选的等参线。 DEFORM + ISOPARAM + DELETEDelete an isoparametric curve from a net 从网面上删除等参线 An isoparametric can be deleted only if there are at least two other isoparametrics with the same direction. 只有当同一方向上至少有两条等参线时，一条等参线才能被删除。 If required, choose the current net 如果需要，选择当前网面 1 Select a NET type element. １选择一个ＮＥＴ型元素。 Delete the isoparametric 删除等参线 The current isoparametric is displayed as a series of circular graphic symbols. 当前等参线作为一系列圆形的修饰符号显示。 2 If required, change the current isoparametric. ２如果需要，改变当前的等参线。 3 Press the YES key to delete the current isoparametric. ３按下ＹＥＳ键删除当前等参线。 DEFORM + ISOPARAM + MODIFYModify an isoparametric curve, a tangent comb or transverse circles of curvature on a net 修改网面上的一个等参曲线，切线的矢量或横向圆的曲率 If required, choose the current NET 如果需要，选当前ＮＥＴ网面 1 Select a NET type element. １选择一个NET型元素 Choose the isoparametric to be deformed 选被变形的等参线 Three graphic symbols are displayed in blinking mode at each node of the current isoparametric. 在每一个当前等参线的节点，三个修饰符号都以亮的方式显示 These symbols are as follows: ．a triangle for the row of points ．an arrow for the tangent comb ．a circular arc for the comb of transverse circles of curvature. 下面是符号： ．三角形用于点的行 ．箭头用于切线的矢量 ．圆弧用于曲率所在横向圆的矢量 2 If required, select an isoparametric on the current NET. ２如果需要，选择当前ＮＥＴ曲面上的等参线． Choose the conditions to be modified 选将被修改的条件 3 If required, select another symbol to impose another node condition. The row of selected symbols is displayed in blinking mode, representing the current node condition to be modified. ３如果需要，选另一个符号施加另一个节点条件．被选符号的行亮显示，表示当前的节点条件会被修改． The row of points is the current node condition 这一排点是当前节点状态 4 Select a CST or CCV type element. ４选择一个CST或CCV型元素． /or/ 4 Select an isoparametric belonging to another net. ／或／ ４选择一条属于另一个网面的等参线． The longitudinal conditions (point tangents and curvatures) of this isoparametric become those of the current isoparametric. 这个等参线的纵向条件（点 切矢 曲率）成为当前等参线． 5 Press the ENTER key to apply also the transverse conditions. ５按下ＥＮＴＥＲ键应用这个横向条件． 6 If required, press the YES key to reverse the orientation of the current isoparametric. ６如果需要，按下ＹＥＳ键改变当前等参线的方向． The current isoparametric can not be selected (which prevents problems of superimposing isoparametrics before concatenation). 当前等参线不可选（在串联之前,阻止了添加等参线问题） The transverse tangent comb is the current node condition 横向的切线矢量是当前节点状态 4 Select a PT type element. 4选择一个PT典型元素. The transverse tangent comb is such that all comb vectors are concurrent at this point. 横向的切线矢量为所有垂直矢量在此点都是一致的 /or/ 4 Select a SUR type element. The tangents are projected onto the surface. /或/ 4选择一个SUR型元素 切线被投影到曲面上. /or/ 4 Select an LN type element to define the new direction of the tangent comb. /或/ 4选择一个LN线型元素定义新的切矢方向. /or/ 4 Key in the components of the new direction of the tangent comb. /或/ 4键入新的切矢方向的组成. /or/ 4 Select an isoparametric belonging to another net. The transverse tangent comb of this isoparametric becomes the tangent comb of the current net isoparametric. /或/ 4选择一个属于另一个网面的等参线. 这个等参线的横向的切矢成为当前网面等参线的切矢. 5 If required, press the YES key to reverse the tangents just imposed. 5如果需要，按下YES键改变刚刚施加的切矢方向。 The comb of transverse circles of curvature is the current node condition 曲率的横向园的矢量是当前节点状态 4 Key in the desired radius of curvature for this comb. 4键入所要的曲率半径给这个矢量。 /or/ 4 Select an LN type element. For each node of the isoparametric, the osculating plane is defined by the tangent and the selected element. The radius of curvature is kept. /或/ 4选择一个LN线型元素 对等参线的每个节点，接触平面由切矢和所选元素定义。曲率半径保持不变。 /or/ 4 Key in a vector component. For each node of the isoparametric, the osculating plane is defined by the tangent and this vector. The radius of curvature is kept. /或/ 4键入一个垂直组成成分。 对等参线的每个节点，接触平面由切矢和垂线定义。曲率半径保持不变。 /or/ 4 Select an isoparametric on another NET. For each node, the new normal plane is defined by the current tangent and the normal taken on the selected isoparametric. The radius of curvature is taken on the selected isoparametric. /或/ 4选择在另一个NET网面上的等参线 对每个节点而言，新的垂直平面由当前切线和在所选等参线上的法向定义。曲率半径在所选等参线上获得。 5 If required, press the YES key to reverse the modified curvatures. 5如果需要，按下YES键改变被修改的曲率。 DEFORM + ORIENTNChange the u or v direction or swap them 改变u和v方向或交换之 If required, choose the current net 如果需要，选当前网面 1 Select a NET type element. 1选一个NET型元素。 The direction symbol is displayed. 显示方向符号。 Modify the orientation 改变方向 2 Select the arrow to reverse the u direction. 2选择箭头使u的方向相反。 /or/ 2 Select the arrow to reverse the v direction. /或/ 2选择箭头使v的方向相反。 /or/ 2 Press the YES key. The u direction becomes the v direction and conversely. /或/ 2按YES键．u方向变成v方向并且进行了转换． SMOOTHSmooth a net 光顺网面 Menu 4 is displayed. 菜单４被显示． Restriction 约束 Any node condition of a net can be freed with the exception of points, excluding the POINTS item which enables points to be freed to smooth the NET as efficiently as possible. 网面的任何节点状态都可以由除点以外元素释放，除POINTS工具条外，都能通过释放点来尽可能有效的光顺ＮET网面． ) h+ t2 N4 [4 N
Consequently, point coordinates remain imposed for smoothing nodes, isoparametrics or crossed double derivatives. However, the coordinates of the freed points can be optimized for the overall smoothing of the NET. 从而，点的坐标仍然被施加用以光顺节点、等参线或交叉的两派生面．然而，被释放点的坐标能被优化以光顺全部的ＮET网面． Use of the NO key NO键的使用 For all interactive smoothing operations, pressing the NO key once restores the previous state and pressing it twice restores the original state. 对所有的交互式光顺操作，按下ＮＯ键一次恢复到以前的状态，按下ＮＯ键两次恢复到初始状态． Note: A comparison NET, with a NO-PICK color, is displayed when the first smoothing operation is performed. It represents the NET in its original state. 注释：当执行了最初的光顺操作时，一个具有NO-PICK不可选颜色的ＮＥＴ网面被显示．并且在初始状态上表示ＮＥＴ网面． SMOOTH + NODESmooth the net at one of its nodes 在一个节点赏光顺网面 If required, choose the current set 如果需要，选当前集 1 Select a NET type element. １选择一个ＮＥＴ型元素 If required, change the impositions 如果需要，改变施加条件 Five graphic symbols are displayed at the current node. 在当前节点，五个修饰符号被显示 These five symbols are as follows: ．a triangle for the point ．two arrows for the two tangents ．two circular arcs for the two curvatures. All the previously imposed conditions blink. 这五个符号如下： ．一个三角形表示点 ．两个箭头表示两个切矢 ．两个圆弧表示两个曲率 所有以前施加的条件都变亮． 2 Select a non-blinking condition to be imposed. ２选择一个非两条件施加． /or/ 2 Select the current NET near another node. ／或／ ２选择在其他节点附近的当前的NET网面 /or/ 2 Select a blinking condition to be freed. /或/ 2选择一个亮显示的条件释放之． Start computation 3 Press the YES key to confirm the smoothing computation. ３按YES键确认光顺计算． 4 If required, press the YES key to iterate the smoothing computation. ４如果需要，按YES键重申光顺计算． SMOOTH + ISOPARAMSmooth the net along an isoparametric curve 沿一条等参曲线光顺网面 If required, choose the current net 如果需要，选当前的网面 1 Select a NET type element. １选择一个NET型元素 If required, change the impositions 如果需要，改变施加条件 The current isoparametric is displayed by means of five graphic symbols, displayed at each point of the isoparametric. 当前等参线通过五个修饰符号的形式显示，显示在等参线的被一个点上． These five symbols are as follows: ．a triangle for the point ．two arrows for the two tangents ．wo circular arcs for the two curvatures. All the previously imposed conditions blink. 这五个符号如下： ．一个三角形表示点 ．两个箭头表示两个切矢 ．两个圆弧表示两个曲率 所有以前施加的条件都变亮． 2 Select a non-blinking condition to be imposed. ２选择一个非两条件施加． If the chosen condition belongs to a transverse comb, all the conditions of the comb blink and become imposed. 如果所选条件属于切线适量，所有的矢量条件都亮显示并且变成都被施加． /or/ 2 Select a blinking condition to be freed. ／或／ ２选择一个亮显示条件释放． If the chosen condition belongs to a transverse comb, none of the comb conditions blinks or is imposed. 如果所选条件属于切线矢量，没有矢量条件亮显示或被施加． Keying in a node condition (curvature or tangent) that belongs to a transverse comb will impose on all these curvatures or tangents a condition opposite to that imposed on the first node of the isoparametric. 键入的一个属于切线矢量的节点条件（曲率或切矢）将施加在所有曲率或切矢条件上，该条件与所施加的最初等参线节点相反． /or/ 2 Select another isoparametric of the current NET. ／或／ ２选择另一个当前NET网面的等参线． Start computation 开始计算 3 Press the YES key to confirm the smoothing computation. ３按YES键确认光顺计算． In this item, the computation only considers the conditions imposed in the direction of the curve. 在这个工具条中，计算仅考虑在曲率方向施加的条件． 4 If required, press the YES key to iterate the smoothing computation. ４如果需要，按YES键重申光顺计算． SMOOTH + POINTSSmooth the whole net and free points 光顺整个网面并释放点 If required, choose the current net 如果需要，选当前网面 1 Select a NET type element. １选择一个NET型元素 Menu 5 appears. 出现菜单５ SMOOTH + POINTS + SINGLEPerform imposition/freeing on a single node 在单一的节点上进行施加／释放 Change the impositions, if required 如果需要，改变施加 Five graphic symbols are displayed at the current node. 在当前节点上五个修饰符号被显示． These five symbols are as follows: ．a triangle for the point, ．two arrows for the two tangents, ．two circular arcs for the two curvatures. 这五个符号如下： ．一个三角形表示点 ．两个箭头表示两个切矢 ．两个圆弧表示两个曲率 2 Select a non-blinking graphic symbol to be imposed on the current node. ２选择一个非亮显示的修饰符号在当前节点施加 /or/ 2 Select a blinking graphic symbol to be freed at the current node. ／或／ ２选择一个亮显示的修饰符号在当前节点释放． If the triangle is selected, menu 6 is displayed to enable definition of the point freeing mode. 如果选定了三角形，菜单６能显示的点的定义释放方式． Start computation 开始计算 3 Press the YES key to perform the computation of the NET smoothing operation involving: ．imposed points if no points have yet been freed ．optimization of the coordinates of the freed points, depending on the types of freeing already chosen. ３按YES键执行光顺NET网面操作的计算，包括： ．如果点还没有被释放，施加点 ．释放点的坐标的优化，依赖于已被选定的类型． If points of the NET have been freed: 如果ＮＥＴ网面的点已经释放： 4 Press the YES key if the deviation of the deformed NET from the original NET is to be computed. ４如果变形后的NET网面背离于最初已经被计算的NET网面，按YES键 /or/ 4 Press the NO key otherwise. ／或／ ４否则按NO键 Display the results in the alphanumeric window 在文字窗口显示结果 For each NET node: ．recall of its coordinates (U,V). ．display of the deviation it underwent along the three axes of the original axis system, with respect to its original position ．display of the distance between its current position and its original position ．recall of its freeing tolerance (in standard units) ．recall of the type of freeing it underwent: －N if it was freed orthogonally at its two tangents －T if it was freed in the plane tangent to the NET －I if it was freed in a sphere －L if it was freed along the direction vector of a LINE －P if it was freed in a plane －C if it was lying on a curve －* if it was imposed. ．display of the distance between its current position and the original NET. 对每一个NET网面节点： ．取消其坐标(U,V) ．由于考虑它的原始位置，显示了沿三个坐标轴与最初坐标系的背离度 ．显示了当前位置和原始位置的距离 ．取消了它的释放公差（标准单位） ．取消了他所经历的释放类型 －N如果在两切线上完全释放 －T如果在NET网面相切平面上释放 －I如果在球体释放 －L如果沿LINE线的垂直方向释放 －P如果在平面上释放 －C如果它依赖于曲线 －*如果它已被施加 ．显示当前位置和原始NET网面间的距离 If desired, display of the deviation of the deformed NET from the original NET, in the message zone. 如果需要，在管理区域，变形后的NET网面与原始的NET网面的偏差的显示． 5 Whatever the case, press the YES key to iterate the smoothing computation. ５无论任何情况，按下YES键重申光顺计算． SMOOTH + POINTS + MULTIPerform imposition/freeing on a whole NET zone 在整个NET网面区域上进行施加／释放 2 Select all nodes defining the desired zone. ２选择所有节点定义所想要的区域． 3 Press the YES key when definition of the desired zone has been completed. ３当所想要的区域的定义已完成时按YES键． 4 Select a non-blinking graphic symbol to be imposed on all nodes of the previously defined zone. ４在所有以前定义区域的节点上，选择一个已经施加的非亮显示修饰符号 /or/ 4 Select a blinking graphic symbol to be freed at all nodes of the previously defined zone. If the triangle is selected, menu 7 is displayed to enable the definition of the point freeing mode for the previously defined zone. ／或／ ４在所有以前定义区域的节点上，选择一个已经释放的亮显示修饰符号 如果选择了三角形，菜单７被显示，它能对以前定义的区域定义点的释放方式． Start computation 开始计算 5 Press the YES key to perform the computation of the NET smoothing operation involving: ．imposed points if no points have yet been freed ．optimization of the coordinates of the freed points, depending on the types of freeing already chosen. ５按YES键执行光顺NET网面的操作的计算包括： ．如果还没有点被释放那么施加点 ．释放点的坐标的优化依赖于已经选择的释放类型． If points of the NET have been freed: 如果NET网面的点已经释放： 6 Press the YES key if the deviation of the deformed NET from the original NET is to be computed. ６如果变形后的NET网面与原始的NET网面的背离度已被计算，按YES键 /or/ 6 Press the NO key otherwise. ／或／ ６否则按NO键． Display the results in the alphanumeric window, if there are freed points 如果有已经释放的点，在字母窗口显示结果 For each NET node: ．recall of its coordinates (U,V). ．display of the deviation it underwent, along the three axes of the original axis system, with respect to its original position ．display of the distance between its current position and its original position ．recall of its freeing tolerance (in standard units) ．recall of the type of freeing it underwent: －N if it was freed orthogonally at its two tangents －T if it was freed in the plane tangent to the NET －I if it was freed in a sphere. －L if it was freed along the direction vector of a LINE －P if it was freed in a plane －C if it was lying on a curve －* if it was imposed. ．display of the distance between its current position and the original NET. 对每一个NET节点： ．取消其坐标(U,V) ．考虑到它的原始位置，显示沿原始坐标系的三个坐标轴所经历的背离度 ．显示了当前位置和原始位置的距离 ．取消了它的释放公差（标准单位） ．取消了他所经历的释放类型 －N如果在两切线上完全释放 －T如果在NET网面相切平面上释放 －I如果在球体释放 －L如果沿LINE线的垂直方向释放 －P如果在平面上释放 －C如果它依赖于曲线 －*如果它已被施加 ．显示当前位置和原始NET网面间的距离 If desired, display of the deviation of the deformed NET from the original NET, in the message zone. 如果需要，在管理区域，变形后的NET网面与原始的NET网面的偏差的显示 7 Whatever the case, press the YES key to iterate the smoothing computation. ７无论任何情况，按下YES键重申光顺计算． SMOOTH + POINTS + GLOBALPerform imposition/freeing on a whole NET zone 在整个NET网面区域上进行施加／释放 2 Select the first node defining the beginning of the desired zone. ２选择第一个节点定义最初想要的区域 3 Select the second point defining the zone between these two nodes. ３选择第二个点定义在这两个节点间的区域 4 Select a non-blinking graphic symbol to be imposed for all nodes in the previously defined zone. ４对以前定义区域上的所有节点，选择已经施加的非亮显示的修饰符号 /or/ 4 Select a blinking graphic symbol to be freed for all nodes in the previously defined zone. If the triangle is selected, menu 7 is displayed to enable definition of the point freeing mode for the previously defined zone. ／或／ ４对以前定义区域上的所有节点，选择已经释放的亮显示的修饰符号 如果三角形被选择，菜单７被显示，它能对以前定义的区域定义点的释放方式． Start computation 开始计算 5 Press the YES key to perform the computation of the NET smoothing operation involving: ．imposed points if no points have yet been freed ．optimization of the coordinates of the freed points, depending on the types of freeing already chosen. ５按YES键，执行光顺NET网面操作，包括： ．如果还没有已经释放的点，施加之 ．释放点的坐标的优化，依赖于已经选择的释放类型 If points of the NET have been freed: 如果NET网面的点已经被释放： 6 Press the YES key if the deviation of the deformed NET from the original NET is to be computed. ６如果被变形的NET网面与原始的NET网面的背离度已被计算，按YES键 /or/ 6 Press the NO key otherwise. ／或／ ６否则按NO键 Display the results in the alphanumeric window, if there are freed points 如果释放点，在字母窗口显示结果． For each NET node: ．recall of its coordinates (U,V). ．display of the deviation it underwent along the three axes of the original axis system, with respect to its original position ．display of the distance between its current position and its original position ．recall of its freeing tolerance (in standard units) ．recall of the type of freeing it underwent: －N if it was freed orthogonally at its two tangents －T if it was freed in the plane tangent to the NET －I if it was freed in a sphere. －L if it was freed along the direction vector of a LINE －P if it was freed in a plane －C if it was lying on a curve －* if it was imposed. ．display of the distance between its current position and the original NET. 对每个NET网面节点： ．取消其坐标(U,V) ．考虑到它的原始位置，显示沿原始坐标系的三个坐标轴所经历的背离度 ．显示了当前位置和原始位置的距离 ．取消了它的释放公差（标准单位） ．取消了他所经历的释放类型 －N如果在两切线上完全释放 －T如果在NET网面相切平面上释放 －I如果在球体释放 －L如果沿LINE线的垂直方向释放 －P如果在平面上释放 －C如果它依赖于曲线 －*如果它已被施加 ．显示当前位置和原始NET网面间的距离 If desired, display of the deviation of the deformed NET from the original NET, in the message zone. 如果需要，在管理区域，变形后的NET网面与原始的NET网面的偏差的显示 7 Whatever the case, press the YES key to iterate the smoothing computation. ７无论任何情况，按下YES键重申光顺计算． SMOOTH + POINTS + SINGLE or MULTI or GLOBAL + NORMAL Free nodes orthogonally at the plane tangent to the NET at each point 在每个点，对NET网面的平面切矢完全释放节点 5 Key in the desired freeing tolerance, in standard units, for these freed points. ５对这些释放的点，用标准单位键入想要的释放公差 The freeing symbols are then displayed on each of the freed points. 然后在每一个释放点，释放符号会被显示． Menu 6, or menu 7, is then removed to enable the definition of other types of freeing or to perform the computation of the smoothing operation with freed points. 然后菜单6或菜单7去除了使其他释放类型的定义成为可能或执行释放点的光顺操作 SMOOTH + POINTS + SINGLE or MULTI or GLOBAL + TANGENT Free nodes in the plane tangent to the NET at each point 在每个点，对NET网面的平面切矢完全释放节点 5 Key in the desired freeing tolerance, in standard units, for these freed points. ５对这些释放的点，用标准单位键入想要的释放公差 The freeing symbols are then displayed on each of the freed points. 然后在每一个释放点，释放符号会被显示． Menu 6, or menu 7, is then removed to enable definition of other type of freeing or to perform the computation of the smoothing operation with freed points. 然后菜单6或菜单7去除了使其他释放类型的定义成为可能或执行释放点的光顺操作 SMOOTH + POINTS + SINGLE or MULTI or GLOBAL + ISOTROP Free nodes in a sphere around each point 在每个点周围的球体上释放节点 5 Key in the desired freeing tolerance, in standard units, for these freed points. ５对这些释放的点，用标准单位键入想要的释放公差 The freeing symbols are then displayed on each of the freed points. 然后在每一个释放点，释放符号会被显示． Menu 6, or menu 7, is then removed to enable definition of other type of freeing or to perform the computation of the smoothing operation with freed points. 然后菜单6或菜单7去除了使其他释放类型的定义成为可能或执行释放点的光顺操作 SMOOTH + POINTS + SINGLE or MULTI or GLOBAL + LINE Free nodes along a line 沿一条线释放节点 5 Key in the desired freeing tolerance, in standard units, for these freed points. ５对这些释放的点，用标准单位键入想要的释放公差 6 Select a LINE type element to define the freeing direction of the freed points. 6选择一个LINE线型元素定义被释放点的释放方向. The freeing symbols are then displayed on each of the freed points. 然后在每一个释放点，释放符号会被显示． Menu 6, or menu 7, is then removed to enable definition of other type of freeing or to perform the computation of the smoothing operation with freed points. 然后菜单6或菜单7去除了使其他释放类型的定义成为可能或执行释放点的光顺操作 SMOOTH + POINTS + SINGLE or MULTI or GLOBAL + PLANE Free nodes in a plane 在平面上释放 5 Key in the desired freeing tolerance, in standard units, for these freed points. ５对这些释放的点，用标准单位键入想要的释放公差 6 Select a PLANE type element to define the freeing plane for the freed points. 6选择一个PLANE平面型元素定义被释放点的释放平面． The freeing symbols are then displayed on each of the freed points. 然后在每一个释放点，释放符号会被显示． Menu 6, or menu 7, is then removed to enable definition of other types of freeing or to perform the computation of the smoothing operation with freed points. 然后菜单6或菜单7去除了使其他释放类型的定义成为可能或执行释放点的光顺操作 SMOOTH + POINTS + SINGLE + CURVEFree a node, projected on a curve, along this curve 释放一个节点，沿该曲线投影到曲线上 3 Key in the desired freeing tolerance, in standard units, for the freed point. ３对这些释放的点，用标准单位键入想要的释放公差 4 Select a CURVE type element to define the freeing curve for the freed point. ４选择一个CURVE型元素对被释放的点定义释放曲线． A freeing symbol is then displayed on the freed point. 然后释放符号在被释放点显示． Menu 6 is then removed to enable definition of other types of freeing or to perform the computation of the smoothing operation with freed points. 然后菜单6去除了使其他释放类型的定义成为可能或执行释放点的光顺操作． SMOOTH + XDBL DERSmooth the interior of the net patches by using the crossed double derivative 通过使用交叉的两派生面光顺网面片内部 If required, choose the current set 如果需要，选当前集 1 Select a NET type element. １选一个NET型元素 Choose the impositions 选择施加条件 The selected net and all the symbols associated with the nodes are highlighted. 选择网面和与高亮度显示的节点的所有符号． These symbols are defined by a letter displayed at each node: ．1 if the crossed double derivative is imposed on this node (previously modified using the DEFORM + NODE items at this node). ．F if the crossed double derivative is free at this node. 这些符号在每个节点以字母显示： ．１如果交叉的两派生面被施加到这个点（以前在此节点修改使用DEFORM + NODE工具条）． ．F如果交叉的两派生面在该点释放． 2 Select a symbol to: ．free an imposed crossed double derivative, or ．impose a freed crossed double derivative. ２选择一个符号： ．释放一个被施加的交叉的两派生面，或 ．施加一个被释放的交叉的两派生面 /or/ 2 Select an isoparametric. ／或／ ２选择一条等参线． 3 Key in the letter I or F to impose or free all the crossed double derivatives of this isoparametric. ３键入字母I 或 F施加或释放这个等参线的所有交叉的两派生面 Choose the type of smoothing operation and start computation 选择光顺操作的类型并且开始计算 4 Press the YES key to request a smoothing selection. ４按 YES键请求光顺选择． 5 Press the YES key to: ．smooth the freed crossed double derivatives ．keep the imposed crossed double derivatives. ５按 YES键来： ．光顺释放的交叉的两派生面 ．保持施加交叉的两派生面 /or/ 5 Press the NO key to request another smoothing selection. ／或／ ５按 NO键请求另一个光顺选择 6 Press the YES key to cancel all the freed crossed double derivatives. ６按 YES键取消所有的释放交叉的两派生面 /or/ 6 Press the NO key to request another smoothing selection. ／或／ ６按 NO键请求另一个光顺选择 7 Press the YES key to: ．smooth the freed crossed double derivatives ．cancel the imposed crossed double derivatives. 7按 YES键： ．光顺被释放的交叉的两派生面 ．取消施加交叉的两派生面 /or/ 7 Press the NO key to return to "Choose the type of smoothing operation and start computation". ／或／ ７按 NO键返回＂选择光顺操作的类型并且开始计算＂ APPROXIMApproximate a net, a surface or a face (with 2, 3 or 4 sides) by a net, by choosing the distribution of future isoparametrics 通过选择将来的等参线的分配，近似一个网面，经过一个网面的曲面或表面（具有２，３或４个侧边） There are several possibilities: 几种可能性： ．evenly distributed isoparametrics. For a face, the isoparametrics of the support surface are used and distributed on the U (and V) domain that is common to the opposite ISO-V (ISO-U) sides. If these domains are not joined, automatic distribution is not proposed. ．平坦分布的等参线．对一个表面而言，支持曲面的等参线被使用，分布在通常与ISO-V (ISO-U)侧相对立的U (和 V)区域．如果这些区域不相连，自动分布就不会执行． ．creation of isoparametrics originating from a point (for faces, proposed if possible). ．等参线的生成源于一个点（对表面来说，如果可能将执行之） ．use of the limits of the original patches (for multipatch surfaces and faces at any possible location). ．原始曲面片的边界的使用（在任何可能的地方对多个面片的曲面和表面） ．selection of edges (for faces this may lead to a relimitation in several isoparametrics). 边缘线的选择（对表面而言，这可以导致在几个等参线上修剪） Any impossible topology configurations are indicated. 任何不可能的拓扑结构都会显示． Repeatedly pressing the NO key enables the user to go back through the interactions step by step. 重复地按NO键能通过交互作用使用户一步一步的退回操作． Choose the surface, the net or the face to be approximated 选曲面，网面或表面将会被近似 1 Select a surface, a net or a face with 2, 3 or 4 sides. １选择一个具有２、３或４个边界曲面、网面或表面． Choose the degenerate side, for 3-sided faces 对３边界表面，选退化的边 If a 3-sided face is selected, the degenerate side is chosen. A number is displayed at each of the face vertices. 如果选择了一个三边界表面，退化的边也会被选上。在每一个表面的极点显示一个数。 2 Key in the number of the vertex which will be the degenerate side. ２键入将是退化的边极点的数。 /or/ 2 Select the number of the vertex which will be the degenerate side. ／或／ ２选择将会是退化的边极点的数。 Define the first set of desired isoparametrics 定义最初的想要的等参线的集 The desired isoparametrics of the net are displayed in dashed lines. 想要的网面的等参线以虚线显示。 3 Key in the number of isoparametrics to be evenly distributed on the corresponding sides (if numbers are displayed on the sides). ３在相应的边（如果在该边上有数显示）键入均匀分布的等参线的数 /or/ 3 If proposed, press the ENTER key to select the patch limits as isoparametrics. ／或／ ３如果想要，按ENTER键选择作为等参线的面片的边界 /or/ 3 If proposed, indicate or select a point to have the isoparametrics originating from this point. ／或／ ３如果打算，指明或选择一个点，则从该点起使等参线初始化． /or/ 3 Select a curve lying on the surface (or the face support) to define one or more isoparametrics. ／或／ ３选择一条在曲面上（或表面支持）的曲线定义一个或多个等参线 Add new isoparametrics or delete isoparametrics previously defined 增加新的等参线或删除以前定义的等参线 The last isoparametrics created are displayed in blinking mode. 最后生成的等参线以闪亮的方式显示 4 Indicate or select a point to have the isoparametrics originating from this point (if proposed). ４明确或选择一个点，则从该点起使等参线初始化（如果打算） /or/ 4 Select an already defined inner isoparametric to refuse it. /或/ ４选择一个已经定义的内部的等参线拒绝之． /or/ 4 Select a curve lying on the surface (or the face support) to define one or more isoparametrics. ／或／ ４选择一条曲面（或表面支持）上的曲线定义一个或多个等参线． Approximate the net and compute the deviation 近似网面并计算背离度 5 Press the YES key to compute the net approximation. ５按YES计算网面的近似值 For the edge approximation, the deviation is displayed as well as the maximum deviation point. 对边缘近似，背离度会与最大背离度点一样显示． 6 If required, press the YES key to compute the maximum deviation with the whole approximated surface (or the face support). ６如果需要，按YES键计算整个近似曲面（或支撑表面）最大背离度 The deviation value and the maximum deviation point are displayed. 背离度值和最大背离点会被显示． 7 Select another net, surface or face to be approximated. ７选择另一个网面，曲面或表面来近似． The dialog continues at "Choose the degenerate side, for 3-sided faces" or "Define a first set of desired isoparametrics". 在“对三边表面，选退化的边”或 “定义最初想要的等参线的集” ，对话框继续 SURFACECreate a SUR type element from a NET type element 从一个NET型元素生成一个SUR型元素 The patch distribution is the same as for the original net. 曲面片的分配与原始网面相同． 1 Select a NET type element. １选一个NET型元素． VISUALTNModify the permanent display of a net 修改网面的永久的显示 1 Select a NET type element. １选择一个NET型元素． Menus 5 and 6 are displayed. 菜单５和６会被显示． The other NET type elements of the current net are displayed in dimmed mode. 当前网面的另一个NET型元素会以暗的方式显示． VISUALTN + NO SHOWHide all or part of a net 隐藏所有或部分网面 VISUALTN + NO SHOW + ARCHide a net arc隐藏一个网面弧线 2 Select a net arc. This arc is hidden. ２选择一个网面弧线 这个弧线会被隐藏． VISUALTN + NO SHOW + ISOPARAMHide a net isoparametric 隐藏一个网面等参线 2 Select a net isoparametric. This isoparametric is hidden. ２选择一个等参线 这条等参线会被隐藏． VISUALTN + NO SHOW + NETHide a net 隐藏一个网面 2 Press the YES key or reselect the net. The net is hidden. ２按YES或再选网面 网面会被隐藏 VISUALTN + SHOWShow all or part of a net 显示所有或部分网面 Only the parts of the net previously hidden using the NO SHOW item are displayed. 只有用NO SHOW工具条隐藏的当前的部分网面会被显示． VISUALTN + SHOW + ARCDisplay a net arc 显示一个网面弧线 2 Select a net arc. This arc is displayed. ２选择一个网面弧线 这个弧线会被显示． VISUALTN + SHOW + ISOPARAMDisplay a net isoparametric 显示一个网面等参线 2 Select a net isoparametric. This isoparametric is displayed. ２选择一个网面等参线 这个等参线会被显示． VISUALTN + SHOW + NETDisplay a net 显示一个网面 2 Press the YES key. The net is displayed. ２按YES键． 网面会被显示． TANGENCYRapid and overall tangent connection of a NET type element on one or more NET or SURFACE type elements 在一个或多个NET 或 SURFACE型元素上，快速和全部的NET型元素的切矢相连接 The tangent comb along a boundary depends on the following node conditions of the sextuplets on this boundary: ．the points, ．the transverse tangents ．the longitudinal tangents ．the longitudinal curvatures ．the crossed double derivatives. 在这个边界上，切线矢量会沿着依靠下面六个节点条件的边界： ．点 ．横向切矢 ．纵向切矢 ．纵向曲率 ．交叉的两派生面 The boundary itself, depending on the points and the longitudinal tangents and curvatures, is not to be modified. These node conditions will therefore not be modifiable. The values which can be optimized are in this case: ．the transverse tangents, except for those located in the corner of two processed boundaries ．the crossed double derivatives on the boundaries. 依靠点和纵向切矢和曲率的边界本身不会被修改．因此这些节点条件不会被修改．能够被优化的数值如下： ．横向切矢，除了位于两过程边界的交角． ．在边界上交叉的两派生面． There are two types of tangent connection: ．where the aim is to achieve tangent continuity of the transverse isoparametric of the NET with the corresponding isoparametric of the support surface. ．where the aim is just to align the normal of the NET with the normal of the corresponding surface. 这里有两种切矢连续类型： ．目的是横向等参线的切矢连续，它具有与支撑曲面相应的等参线的NET网面． ．目的恰恰是NET网面的垂直排列，它与相应曲面垂直． 1 Select a NET type element. The boundaries of the NET are numbered. １选择一个NET网面型元素 NET网面的边界是数值． 2 Select, or key in, the number of the boundary along which a tangent connection is to be completed. ２选择或键入沿切矢连续的边界的数值会完成． 3 Select the NET or SURFACE type element to perform the tangent connection. ３选择NET 或 SURFACE型元素完成切矢连续． 4 Press the YES key to complete a connection so that the normals of the boundary involved will tend to be aligned with the normals of the connecting surface. ４按YES键，完成一个连接，因此包含的边界的法线将趋于连接曲面的法向排列 /or/ 4 Select an arrow to complete a tangent connection which will tend to align the isoparametrics of the NET with those of the connecting surface. ／或／ ４选择箭头完成切矢连续，它将趋于与相连曲面的NET网面的等参线方向排列． 5 Return to interaction number 2 to select a new boundary along which a tangent connection will be completed. ５返回交互作用数值２，选择一个新的边界，其切矢连续将完成 /or/ 5 Press the YES key to go on to the following step, modifying impositions of transverse tangents and/or crossed double derivatives. ／或／ ５按YES键继续下面的步骤，修改横向切矢并且／或交叉的两派生面的施加条件． Change impositions if required 如果需要改变施加条件 Two graphic symbols are displayed at the nodes of the selected boundaries. 两修饰符号显示在所选边界的节点． These two symbols are as follows: ．an arrow for a transverse tangent, except if located at the corner of two processed boundaries, ．a letter (F or I) for a crossed double derivative. 这两个符号如下： ．横向切矢的箭头，除非在位于两个被修改边界的角落 ．一个符号（Ｆ或Ｉ）用于交叉的两派生面 6 Select a non-blinking arrow to impose the transverse tangent at the corresponding node. ６选择非亮显示的箭头在相应的节点施加横向切矢 If desired, press ENTER to apply this imposition to the whole boundary involved. 如果需要，按ENTER键在整个有关的边界应用施加条件． /or/ 6 Select a blinking arrow to free the transverse tangent at the corresponding node. ／或／ ６选择亮显示的箭头在相应的节点释放横向施加切矢． If desired, press ENTER to apply the freeing operation to the whole boundary involved. 如果需要，按ENTER键在整个有关的边界应用释放操作． /or/ 6 Select F to impose the crossed double derivative at the corresponding node. ／或／ ６选择F在相应的节点施加交叉的两派生面． If desired, press ENTER to apply this imposition to the whole boundary involved. 如果需要，按ENTER键在整个有关的边界应用施加条件． /or/ 6 Select I to free the crossed double derivative at the corresponding node. ／或／ ６选择I在有关节点释放交叉的两派生面． If desired, press ENTER to apply this freeing operation to the whole boundary involved. 如果需要，按ENTER键在整个边界应用释放操作． 7 Press the YES key to end computation of the NET connection. ７按YES键结束NET网面连接计算． 8 Press the YES key to compute the deviation of the deformed NET from the original NET. ８按YES键计算变形的NET网面与原始的NET网面的背离度． /or/ 8 Press the NO key otherwise. ／或／ ８否则按NO键． Display the results in the alphanumeric window 在字母窗口显示结果 ．For each boundary along which a tangent connection has been completed: －recall of the type of connection completed －recall of the surface used to complete the connection －display of the maximum deviation in terms of points on each boundary, with a corresponding display on the NET boundary involved －display of the maximum angle deviation of the normals of the NET from those on the connecting surface, with a corresponding display on the NET boundary involved －display of the maximum angle deviation between the isoparametrics of the NET and those of the connecting surface, with a corresponding display on the NET boundary involved ．对每个切矢连续已经完成的边界： －连接类型的取消已完成 －取消用于完成连接的曲面 － ．if requested, display of the deviation of the deformed NET from the original NET. Ｎote: A comparison NET, with a NO-PICK color, is displayed when deformation takes place. It represents the NET in its original state.
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发表于 2014-7-9 16:55
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