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Fix ND_UsdTransform2D implementation #2924

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Merged
jstone-lucasfilm merged 1 commit into from
May 14, 2026
Merged

Fix ND_UsdTransform2D implementation #2924

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28 changes: 21 additions & 7 deletions libraries/bxdf/usd_preview_surface.mtlx
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Original file line number Diff line number Diff line change
Expand Up @@ -430,14 +430,28 @@
</nodegraph>

<!-- Node: UsdTransform2d -->
<!-- Note : The UsdTransform2d node transforms texture coordinates, not the
textures themselves, so to get the effect of moving, resizing, or
rotating an image being applied to a surface, one must apply the inverse
transformation of how you expect the image to move. -->
<nodegraph name="IMP_UsdTransform2d" nodedef="ND_UsdTransform2d">
<place2d name="placement" type="vector2">
<input name="texcoord" type="vector2" interfacename="in" />
<input name="scale" type="vector2" interfacename="scale" />
<input name="rotate" type="float" interfacename="rotation" />
<input name="offset" type="vector2" interfacename="translation" />
</place2d>
<output name="out" type="vector2" nodename="placement" />
<multiply name="N_applyscale" type="vector2">
<input name="in1" type="vector2" interfacename="in" />
<input name="in2" type="vector2" interfacename="scale" />
</multiply>
<multiply name="N_invrot" type="float">
<input name="in1" type="float" value="-1" />
<input name="in2" type="float" interfacename="rotation" />
</multiply>
<rotate2d name="N_applyrot" type="vector2">
<input name="in" type="vector2" nodename="N_applyscale" />
<input name="amount" type="float" nodename="N_invrot" />
</rotate2d>
<add name="N_applyoffset" type="vector2">
<input name="in1" type="vector2" nodename="N_applyrot" />
<input name="in2" type="vector2" interfacename="translation" />
</add>
<output name="out" type="vector2" nodename="N_applyoffset" />
</nodegraph>

</materialx>
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