B-P Normal Map Relief depends on Prim Orientation

[canny]

The orientation of a prim is affecting its bump-map shadow effect (relief). An upside down prim seemingly inverts the effect, turning an emboss into an engrave. This is showing in Firestorm and LL viewer, which was updated moments ago.

The effect is shown in the images below

-First is a single prim 1m square

-Second section is a 4x4 grid of 0.25m prims, rotated differently but textures aligned

-Third and Fourth are the same things using Materials rather than Blinn-Phong, which do not have the issue

The bug is the Second section showing differing relief amounts even though they are co-planar and same orientation. The difference here is the orientation of the prims themselves.

https://secondlife.canny.io/admin/board/bug-reports/p/b-p-normal-map-relief-depends-on-prim-orientation

[canny]

This issue has been linked to a Canny post: B-P Normal Map Relief depends on Prim Orientation 🎉

[Dan-Linden]

In my testing, this appears to be caused by the rotation of the normal map on the object, not the rotation of the object.

Image showing 4 cubes with the default orientation. The top cube has a normal map with zero rotation. The 2nd cube's normal map has 90 degree rotation, 3rd cube's normal map has 180 degree rotation, the 4th cube's normal map has 270 degree rotation. The "top" of the "001" has the highlight on each prim, which is incorrect for the 2nd, 3rd, and 4th cubes.