[img=http://2.bp.blogspot.com/_zs4s_2i1_O8/SawFIcEOOcI/AAAAAAAACVw/VD5auDDqxWE/s1600/lasercut02.jpg][lasercut02.jpg][/img]
在这个blog：freeformfever.blogspot.com上看到的 他能让网架沿垂直于曲面的方向延伸，求解怎样用grasshopper实现这种效果。作者是这样说的：
This is my version of something i have seen on www.liftarchitects.com. In addition to their solution, i come up with the possibility to choose my own vector for loft-rulings. I use one C# script component for the separation of lofts, along with another which just lets me choose between three methods (see below) of providing a generic list of vectors defining the directions of rulings, before they are passed through the component based on the status of an integer-slider. I didn't find an easier way to do this, although the script itself is piece of cake ;)
rulings are parallel to global z-direction (developable)
an appropriate ruling-direction can be chosen explicitly (developable)
rulings are surface-normals. general ruled surfaces. (non-developable)
Note that the third variant, the one based on surface normals, consists of non-torsal ruled surfaces, which in general are non-developable, meaning that they cannot be projected to a plane without distortion, and one will get some irregularities when trying to produce the structure this way.
What i didn't add yet is a method for the production of vertical slots at intersections of struts, but since i am going to lasercut such a construction soon, i will have to add it within the next days. I'm also planning to add a fourth method which will average rulings for each loft individually. This could come in handy if the input-surface is not too twisted. Watch out for that.
Posted by Heinz Schmiedhofer at 09:00
作者称他是用一段c++代码实现的。这篇文章没有放源文件的下载链接，我在别的文章中找到一个链接，下载下来后效果与此有些类似。我在gh文件中就找到一个c++组件，代码如下
class Grasshopper_Custom_Script
{
#region members
private MRhinoApp app;
private MRhinoDoc doc;
public System.Object A;
#endregion
void RunScript(List<On3dPoint> myPts, int Uval, int Vval)
{
// Segmentation of UV Vertices into Quad Mesh Faces
// Heinz Schmiedhofer / TU Vienna / 2009
List<OnMesh> qfaces = new List<OnMesh>();
int face_count = 1;
int vertex_count = 4;
bool bVertexNormals = false;
bool bTextureCoordinates = false;
int upts = Uval + 1;
int vpts = Vval + 1;
for(int x = 0; x < Uval; x++){
for(int y = 0; y < Vval; y++){
int q1 = x * vpts + y;
int q2 = x * vpts + y + vpts;
int q3 = q2 + 1;
int q4 = q1 + 1;
OnMesh mesh = new OnMesh(face_count, vertex_count, bVertexNormals, bTextureCoordinates);
mesh.SetVertex(0, myPts[q1]);
mesh.SetVertex(1, myPts[q2]);
mesh.SetVertex(2, myPts[q3]);
mesh.SetVertex(3, myPts[q4]);
mesh.SetQuad(0, 0, 1, 2, 3);
mesh.ComputeVertexNormals();
mesh.Compact();
qfaces.Add(mesh);
}
}
A = qfaces.ToArray();
}
#region "Additional methods and Type declarations"
#endregion
}
有点看不太懂，而且我自己也不会写c++代码，大家来研究一下怎么用gh实现吧……
附上：
[ 本帖最后由 qiancy88 于 2009-3-7 20:29 编辑 ] |
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