Hello,

I’m trying to generate a model starting from a list of points which defines an area on the x,y plane

and extrude it along the z axis. At the moment, I’m struggling with the primitives.

Let’s suppose that I have the following situation:

```
vertices = #points on the x,y plane
#obtained from a scipy Voronoi(using the vertices
#property)
region = #a list of indices of vertices(using the regions property)
vdata = GeomVertexData('gdata',
GeomVertexFormat.getV3n3c4t2(),
Geom.UHStatic)
#Number of vertices = the points on the x,y plane
#plus the same points shifted on the z axis
vdata.setNumRows(len(region) * 2)
vertex = GeomVertexWriter(vdata, 'vertex')
normal = GeomVertexWriter(vdata, 'normal')
color = GeomVertexWriter(vdata, 'color')
texcoord = GeomVertexWriter(vdata, 'texcoord')
for pt in region:
#ground level
vertex.addData3(vertices[pt][0],
vertices[pt][1],
0)
normal.addData3(0,0,1)
color.addData4(255,0,0,255)
texcoord.addData2(1,0)
#same point shifted on the z axis
vertex.addData3(voronoi_vertices[pt][0],
voronoi_vertices[pt][1],
20)
normal.addData3(0,0,1)
color.addData4(255,0,0,255)
texcoord.addData2(1,0)
```

at this point I should generate the primitives. The problem is that I don’t know where to start: I cannot link random points with GeomTriangles’ addVertices method and expect to get a good result, so, how should I choose which points to connect with a triangle?