Houdini UV Flatten Sop – Edge groups

SideFX Houdini

It seems that the UV Flatten nodes likes edge loop winding in the same direction.

Counter clockwise is Houdini’s winding direction that has normals facing the positive Y direction. This also applies to creating curves as well, if you want the curve’s closed geometry facing up, create the curve counter clockwise.

This problem came up trying to UV a simple rectangle that has bevel applied. By specifying the correct edges but wrong directions, we end up with one of the most stupid UV time toilets imaginable.

Messed up UV normals

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