Hi.
I’ve used python scripts with Blender for some time now to do little things like
- switching objects’ render visibility
- change/rotate objects
before rendering. Never got I problem the API documentation turned me down.
But now I have a problem I can not understand:
The goal is to change material on some parts of an object. The script works as it should but the rendered image does not reflect these changes.
I attach a demo file with my script. When invoked
blender -b test.blend -P render.py
both generated images are identically. That’s wrong.
When I do
blender test.blend -P render.py
to start the GUI, I can clearly see that the script worked and the cube’s right face has been set to the blue material.
I even can press F12 to render it and the face is blue.
What do I miss?
Ok, the script cannot be attached -.- Here is it:
import bpy
def select_material_slot_by_name(material_name):
for material_slot_index in range(len(bpy.data.objects["Cube"].material_slots)):
if bpy.data.objects["Cube"].material_slots[material_slot_index].name == material_name:
bpy.data.objects["Cube"].active_material_index = material_slot_index
# as is
bpy.context.scene.render.filepath = "render-as-is"
bpy.ops.render.render(animation = True)
# set material to blue
bpy.context.scene.objects.active = bpy.data.objects["Cube"]
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.mesh.select_all(action='DESELECT')
bpy.ops.object.vertex_group_set_active(group="color me")
bpy.ops.object.vertex_group_select()
select_material_slot_by_name("blue")
bpy.ops.object.material_slot_assign()
bpy.context.scene.render.filepath = "render-blue"
bpy.ops.render.render(animation = True)
I am using Blender v2.74.
Attachments
test.blend (469 KB)
