Could you reproduce the problem in the Playground?
The invView matrix is only used in the BILLBOARDMODE_ALL mode, and I just tested a PG using this mode and was able to verify with Spector that the invView matrix was not empty:
Could you reproduce the problem in the Playground?
The invView matrix is only used in the BILLBOARDMODE_ALL mode, and I just tested a PG using this mode and was able to verify with Spector that the invView matrix was not empty: