Blender 2.81 | Python 3.74
By default, mesh triangles are not accessible to Python in Blender.
When accessing the mesh triangles is needed, they must be calculated first using the ‘calc_loop_triangles’ Mesh object method.
Before the calc_loop_triangle method has been called, the loop_triangles property of the Mesh object will reference a empty collection.
After calling the calc_loop_triangles method, the loop_triangles property will reference a collection of MeshLoopTriangle objects, in which the vertices property will hold an array of 3 integers that are the indices of the triangle vertices.
The following example script creates and places sphere objects at the centers of the cube’s triangles:
import bpy mesh = bpy.data.objects['Cube'].data mesh.calc_loop_triangles() for tri in mesh.loop_triangles: tri_center = (mesh.vertices[tri.vertices].co * 0.333) +\ (mesh.vertices[tri.vertices].co * 0.333) +\ (mesh.vertices[tri.vertices].co * 0.333) bpy.ops.mesh.primitive_uv_sphere_add(radius=0.1, enter_editmode=False, location=tri_center)
* note that when copying and pasting a script from this example, the indentation may not be pasted correctly.