I have a 3D model with 2 surface sets. The normal vectors of the two sets point into the +z and the -z directions.

Activating VELO_NORMAL_LS for both sets yields an error regarding the ROT calculation:

Goma Error: could not associate normals to coord [0,0,0], [0,0,0], [0,0,0] (@ /opt/goma-src/src/bc/rotate_util.c:85)

Activating VELO_NORMAL_LS for a single set runs without a problem. Thus, I assume it is not a mesh or set definition problem.

Are there any limitations when using VELO_NORMAL_LS without specifying ROT?