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October 4, 2022 23:32
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A little script I wrote that helps with 2D puppet texturing (Blender)
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| # assumes you have a mesh selected | |
| # assumes your image ref is on the XZ plane | |
| # assumes your verts are also on the XZ plane | |
| import bpy | |
| import bmesh | |
| # Get active mesh | |
| ob = bpy.context.object | |
| me = ob.data | |
| if me.is_editmode: | |
| bm = bmesh.from_edit_mesh(me) | |
| else: | |
| bm = bmesh.new() | |
| bm.from_mesh(me) | |
| # get the collection in which it resides (to get the image reference) | |
| collection = ob.users_collection[0] | |
| imgref = None | |
| for obj in collection.objects: | |
| if obj.type == "EMPTY": | |
| imgref = obj | |
| # determine world space dimensions of the image reference | |
| (width, height) = imgref.data.size | |
| if height > width: | |
| (unitwidth, unitheight) = (imgref.empty_display_size * (width/height), imgref.empty_display_size) | |
| else: | |
| (unitwidth, unitheight) = (imgref.empty_display_size, imgref.empty_display_size * (height/width)) | |
| print('image: (%.3f, %.3f)' % (unitwidth, unitheight)) | |
| # loop through poly and find the verts + uvs | |
| # do some math to get world space position of UV | |
| # world space must be offset by half the image width and height to align world origin with UV origin | |
| # then simply use (pos.x / unitwidth, pos.y / unitheight) for UV value | |
| uv_lay = bm.loops.layers.uv.active | |
| for face in bm.faces: | |
| for loop in face.loops: | |
| vert = loop.vert | |
| vertWorld = ob.matrix_world @ vert.co | |
| (wu, _, wv) = vertWorld | |
| wu += unitwidth * 0.5 | |
| wv += unitheight * 0.5 | |
| wu = wu / unitwidth | |
| wv = wv / unitheight | |
| print('u: %.3f' % wu, ' v: %.3f' % wv) | |
| loop[uv_lay].uv = (wu, wv) | |
| if bm.is_wrapped: | |
| bmesh.update_edit_mesh(me, False, False) | |
| else: | |
| bm.to_mesh(me) | |
| me.update() |
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