Proper UV Coords and Joint Rotation/position Export

Coding Python Support
1

Had my exporter working fine for UV Coords to export but since the update to 2.63. So ive been trying to try a few things for the past week and no luck has appeared. The closest i’ve been is exporting values but, they are incorrect.
Example:
Whats exporting from Blender


0.669797 1.300080
0.318956 1.496827
0.377478 1.571246

What should be exporting:


0.344562 1.453787
0.318956 1.503173
0.346527 1.510960

As for the code to get the UV Coords:


for obj in bpy.context.selectable_objects:
		
		if obj.type == 'MESH':
			temp = obj.data
			me = bmesh.new()
			me.from_mesh(temp)
			
			me.transform(EXPORT_GLOBAL_MATRIX * obj.matrix_world)
			
			try:
				materials.extend(temp.materials)
			except:
				materials.extends(None)
			
			uv_layer = temp.uv_layers.active
			
			for face in me.faces:
				
				try:
					uv1x = uv_layer.data[face.verts[0].index].uv.x
					uv1y = uv_layer.data[face.verts[0].index].uv.y
				except:
					uv1x = 0.0
					uv1y = 0.0
				try:
					uv2x = uv_layer.data[face.verts[1].index].uv.x
					uv2y = uv_layer.data[face.verts[1].index].uv.y
				except:
					uv2x = 0.0
					uv2y = 0.0	
				try:
					uv3x = uv_layer.data[face.verts[2].index].uv.x
					uv3y = 2.0 + vec(uv_layer.data[face.verts[2].index].uv.y
				except:
					uv3x = 0.0
					uv3y = 0.0
				try:
					uv4x = uv_layer.data[face.verts[3].index].uv.x
					uv4y = 2.0 + vec(uv_layer.data[face.verts[3].index].uv.y
				except:
					uv4x = 0.0
					uv4y = 0.0

I’ve added 2.0 to each y (don’t ask why it was more suggested for the last version and it worked fine so I thought id try it. Any Advice?

Also, been looking for how to get the world position for joints as well as the rotation for the joints. I have got values but they are incorrect. Here is my code:


for obj in bpy.context.selectable_objects:
		me = obj.data
		
		if obj.type == 'ARMATURE':
			obj.matrix_local *= obj.matrix_world
			for bone in me.bones:
				
				getBoneRot = bone.matrix_local.to_euler()
				fw(bone.name + '
')
				try:
					fw(bone.parent.name + '
')
				except:
					fw('null
')
				fw('%.6f %.6f %.6f %.6f %.6f %.6f
' % (bone.head.x, bone.head.y, bone.head.z, getBoneRot.x, getBoneRot.y, getBoneRot.z))
2

first off, there’s no Mesh.faces in 2.63, Bmesh uses Mesh.polygons instead.

Your code tries to retrieve uv data like it was done before 2.63, using uv1-uv4. They corresponded to a face’s vertices_raw (every face was internally a quad).

This is no longer the case! uv_layers contains uv coordinates per face loop. And faces can be n-gons now.

A simple cube has 8 vertices, 8 edges, 6 faces and 24 loops:

vertex colors and uv coords are stored per loop, not as properties of faces/vertices.


>>> for p in bpy.context.object.data.polygons:
...     for v in p.vertices:
...         bpy.context.object.data.vertices[v].co # Vert coords of the polygon
...         bpy.context.object.data.uv_layers.active.data[v].uv # matching UV coords (poly vert indices equal uv layer loops here)

Bone matrices in world space: i used this for my CoD-IO script:

b_matrix = armature.matrix_world * bone.matrix_local
file.write("X %.6f %.6f %.6f
" % (b_matrix[0][0], b_matrix[1][0], b_matrix[2][0]))
file.write("Y %.6f %.6f %.6f
" % (b_matrix[0][1], b_matrix[1][1], b_matrix[2][1]))
file.write("Z %.6f %.6f %.6f
" % (b_matrix[0][2], b_matrix[1][2], b_matrix[2][2]))

Note that matrices are row-major since 2.62, before you had to use:

file.write("X %.6f %.6f %.6f
" % (b_matrix[0][0], b_matrix[0][1], b_matrix[0][2]))
file.write("Y %.6f %.6f %.6f
" % (b_matrix[1][0], b_matrix[1][1], b_matrix[1][2]))
file.write("Z %.6f %.6f %.6f
" % (b_matrix[2][0], b_matrix[2][1], b_matrix[2][2]))

–> [#1][#2] swapped to [#2][#1]

3

Thanks for the reply!

For the UV Coords:

Is that not essentially what I am doing?

me is a bmesh thats got its data from a mesh object. therefore

bmesh.faces[0].verts[0].index should return the first verts index on the first face correct? still such thing as faces i hope haha.

but then use:

object.data.uv_layer.data[me.faces[0].verts[0].index].uv

should that not do the same thing as what you have shown me?

For the Bone Position and rotation, ill take a look when i get home!

Once again thanks for the reply :slight_smile: