solstice-solver

commit f8670eb2268b2604d71f04e1ea8a0664b442c28c
parent 74fdffe2c6ad99adca85a8aa923961c5ae261524
Author: Vincent Forest <vincent.forest@meso-star.com>
Date:   Wed, 22 Mar 2017 10:21:49 +0100

Fix the path-tracing renderer

The surfaces may be lit by the sun even though it looks backward the
sun.

Diffstat:
M
src/ssol_draw_pt.c
 | 
5
+++++

1 file changed, 5 insertions(+), 0 deletions(-)
diff --git a/src/ssol_draw_pt.c b/src/ssol_draw_pt.c
@@ -104,7 +104,12 @@ sun_lighting
   ASSERT(sun && view && ray_data && bsdf && wo && N && ray_org);
   ASSERT(d3_dot(wo, N) >= 0); /* Assume that wo point outward the surface */
 
+  /* Ensure that the incoming direction point outward the surface */
   d3_minus(wi, sun->direction);
+
+  /* The point look backward the sun */
+  if(d3_dot(wi, N) < 0) return 0.0;
+
   R = ssf_bsdf_eval(bsdf, wo, N, wi);
   if(R <= 0) return 0.0;