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When I plot points of a mesh to 2d using bpy_extras.object_utils.world_to_camera_view the object is centered to the camera. However the actual camera in 3d mode the objects are not centered.

An image is probably the best way to illustrate what I was expecting versus the results I am getting (see below).

Is there anyway to get these meshes off center as the camera actually sees them?

Expected:

Expecting To see this

Actual:

Actuallying seeing this

I don't know if my python code is to blame.. here it is:

..snip.. (for each vector of each mesh)
blenderVertexIndex = bpy.data.objects[obj.name].data.polygons[indexFace].vertices[indexVector]
coordinate3D = bpy.data.objects[obj.name].data.vertices[blenderVertexIndex].co * obj.matrix_world
coordinate2D = bpy_extras.object_utils.world_to_camera_view(bpy.context.scene, bpy.data.objects["Camera"], coordinate3D)
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There may be another issue here, but at least the matrix-vector multiplication order from object to world space is wrong, it should be the other way around:

coordinate3D = obj.matrix_world * bpy.data.objects[obj.name].data.vertices[blenderVertexIndex].co
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  • $\begingroup$ i.imgur.com/Q4z0ltl.gif Thank you! this is exactly the problem. But I've got to ask. Was the * operator changed by python or by blender? Is this a common occurrence in vector math?? $\endgroup$ – user1529413 Feb 26 '14 at 5:36
  • $\begingroup$ There was a change in 2.62 $\endgroup$ – CodeManX Feb 26 '14 at 7:13

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