solstice

commit ba45aa5f7dd5aa1ec93e091f7f983df1821c5494
parent 04fc04a8f336416b5dfbe62239be7b67879c774f
Author: Vincent Forest <vincent.forest@meso-star.com>
Date:   Thu,  6 Apr 2017 15:59:09 +0200

Fix the wrong tangent space in the matte normal mapping

Use the partial derivatives of the position in U and V to build the
tangent space to world space matrix.

Diffstat:
M
src/solstice_material.c
 | 
7
++++++-

1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/solstice_material.c b/src/solstice_material.c
@@ -75,7 +75,12 @@ matte_get_normal
   SSOL(image_sample(param->normal_map, SSOL_FILTER_NEAREST,
     SSOL_ADDRESS_CLAMP, SSOL_ADDRESS_CLAMP, frag->uv, N));
 
-  d33_basis(basis, frag->Ns);
+  d3_set(basis+0, frag->dPdu);
+  d3_set(basis+3, frag->dPdv);
+  d3_set(basis+6, frag->Ng);
+  d3_normalize(basis + 0, basis + 0);
+  d3_normalize(basis + 3, basis + 3);
+
   d3_subd(N, d3_muld(N, N, 2), 1);
   d33_muld3(N, basis, N);
   d3_normalize(val, N);