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UV Export: add option to export UV tiles #104940

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Damien Picard merged 4 commits from pioverfour/blender-addons:dp_export_uv_udim into main 2023-10-09 22:32:24 +02:00
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io_mesh_uv_layout/__init__.py
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@ -213,11 +213,11 @@ class ExportUVLayout(bpy.types.Operator):
# Ignore UVs at corners - precisely touching the right or upper edge
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Jesse Yurkovich commented 2023-10-09 03:11:54 +02:00
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There's a small gotcha here in that UV coords that "touch" the upper edge or the right edge of a tile might be categorized as existing in the tile above or to the right of its "real" tile. I.e. export the default Cube in UDIM layout and you'll get 2 tiles, 1001 and 1011.

You can mimic what's done in Cycles here to lie about such UV coords: https://projects.blender.org/blender/blender/blame/branch/main/intern/cycles/scene/attribute.cpp#L461

There's a small gotcha here in that UV coords that "touch" the upper edge or the right edge of a tile might be categorized as existing in the tile above or to the right of its "real" tile. I.e. export the default Cube in UDIM layout and you'll get 2 tiles, 1001 and 1011. You can mimic what's done in Cycles here to lie about such UV coords: https://projects.blender.org/blender/blender/blame/branch/main/intern/cycles/scene/attribute.cpp#L461
Damien Picard commented 2023-10-09 12:02:00 +02:00
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This works well on the cube!

This works well on the cube!
# of a tile should not load its right/upper neighbor as well.
# From intern/cycles/scene/attribute.cpp
u, v = (uv[0], uv[1])
x, y = (floor(u), floor(v))
if (x > 0 and (u < x + 1e-6)):
u, v = uv[0], uv[1]
x, y = floor(u), floor(v)
if x > 0 and u < x + 1e-6:
x -= 1
if (y > 0 and (v < y + 1e-6)):
if y > 0 and v < y + 1e-6:
y -= 1
tiles.add((x, y))
return tiles