UV map on Python-generated mesh

Coding Python Support
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1

Hi folks
I’m struggling with assigning a UV map on a mesh I generate with Python.
The mesh is fine but I can’t figure out how to apply the UVs.
Here’s my code. Should run without any prerequisites:

import bpy
import math

step = 2
 
# make mesh
vertices = []
edges = []
faces = []
uvs = []

for y in range(-90,91, step):
    for x in range(0,360,step):
        vx = math.sin(x/180*math.pi) * math.cos(y/180*math.pi)
        vy = math.cos(x/180*math.pi) * math.cos(y/180*math.pi)
        vz = math.sin(y/180*math.pi)
        vertex = (vx, vy, vz)
        vertices.append(vertex)
        
        vu = 0.5 * (1 + math.sin(x/180*math.pi) * ((y+90)/180))
        vv = 0.5 * (1 + math.cos(x/180*math.pi) * ((y+90)/180))
        uv = (vu, vv)
        uvs.append(uv)

ry = len(range(-90,91, step))
rx = len(range(0,360,step))

for y in range(ry+1):
    for x in range(rx):
        v1 = y * rx + (x) % rx
        v2 = y * rx + (x+1) % rx
        v3 = v2 + rx
        v4 = v1 + rx
        
        if v3 >= len(vertices):
            break
        
        face = (v1, v2, v3, v4)
        faces.append(face)


new_mesh = bpy.data.meshes.new('new_mesh')
new_mesh.from_pydata(vertices, edges, faces)
new_mesh.update()
# make object from mesh
new_object = bpy.data.objects.new('new_object', new_mesh)
# make collection
new_collection = bpy.data.collections.new('new_collection')
bpy.context.scene.collection.children.link(new_collection)
# add object to scene collection
new_collection.objects.link(new_object)


new_uv = new_object.data.uv_layers.new(name='NewUV') 
for loop in new_object.data.loops:
    new_uv.data[loop.index].uv = uvs[loop.index]

Thank you very much!
Bastian

2

new_object.data.uv_layers.active = new_uv will assign the UV you’ve just created as the active UV.

3

Thank you very much. Something seems to be still missing. But using a second script, I’ve got my model and it’s ok :slight_smile: