多重曲面
一个多重曲面是由两个或以上曲面组合在一起构成的。一个构成封闭空间的多重曲面又称为实体。
只要一个曲面或多重曲面完全封闭，就可以在任何时候创建为实体。
一些 Rhino 指令，例如 Pyramid, Cone, 和 TruncatedCone, 都可以创建多重曲面实体。
相关指令
选取多重曲面
SelPolysrf
Select all polysurfaces.
SelClosedPolysrf
Select all closed polysurfaces.
SelOpenPolysrf
Select all open polysurfaces.
绘制多重曲面
Boss
Extrude closed planar curves normal to the curve plane toward a boundary surface where the boundary surface is trimmed and joined to the extruded objects.
Box
Draw a solid box.
Cone
Creates a surface cone.
Cylinder
Draw a polysurface cylinder.
Fin
Extrude a curve on a surface in the surface normal direction.
Pipe
Create a surface, polysurface, or extrusion object with a circular profile around a curve.
Pyramid
Draw a pyramid.
Rib
Extrude a curve in two directions to a boundary surface.
Ribbon
Offset a curve and create a ruled surface between the curves.
Slab
Offset a polyline, and extrude and cap the result to create a solid.
TruncatedCone
Draw a NURBS truncated cone.
TruncatedPyramid
Draw a pyramid whose apex is truncated by a plane.
将曲线挤出为多重曲面
ExtrudeCrv
Drive closed planar curves in a straight line.
ExtrudeCrvAlongCrv
Drive closed planar curves along a path curve.
ExtrudeCrvTapered
Drive closed planar curves in a straight line tapering at an angle.
ExtrudeCrvToPoint
Drive closed planar curves tapering to a point.
将曲面挤出为多重曲面
ExtrudeSrf
Drive surface edges in a straight line to create a solid.
ExtrudeSrfAlongCrv
Drive surface edges along a path curve to create a solid.
ExtrudeSrfTapered
Drive surface edges in a straight line tapering at an angle to create a solid.
ExtrudeSrfToPoint
Drive surface edges tapering to a point to create a solid.
挤出物件
Box, Cylinder, Pipe, Slab, Tube, 和 ExtrudeCrv 指令可以创建多重曲面或挤出物件。
- 含有大量多重曲面的模型文件，由于对资源的需求相对较高，性能可能会很低，如果在 Rhino 中相同的物件都是作为轻量级的挤出物件存在，则模型的响应更快，并且可以留出更多可用内存。
- 使用 UseExtrusions 指令可以设置挤出操作得到的结果是挤出物件还是多重曲面，如果想挤出得到的是多重曲面而不是挤出物件，可以将选项设置为多重曲面。
- 在 UseExtrusions 指令中选择多重曲面选项会导致选项 > 一般中的条件允许时建立挤出物件关闭。
相关指令
UseExtrusions
Specify whether extrusion objects or polysurfaces are used when extruding straight‑sided objects.
UseExtrusions 指令可以控制挤出物件的类型。
- 开启 UseExtrusions，在可能的情况下，将用挤出物件表示实体和曲面。
- 关闭 UseExtrusions，这些指令将创建曲面和多重曲面物件。
- 关闭 UseExtrusions 不会影响已经挤出的挤出物件。
ConvertExtrusion
Convert extrusion objects to surfaces and polysurfaces.