solstice-solver

commit cfa76bd75b2b7af6a880722c87ebd519dc2dd482
parent 9f505552613ea999b476483243fc33387428a84c
Author: Vincent Forest <vincent.forest@meso-star.com>
Date:   Tue,  7 Mar 2017 14:33:48 +0100

Fix an issue in the path tracing integrator

The outgoing direction was wrongly handled in the setup of the surface
fragments and in the computation of the direct lighting.

Diffstat:
M
src/ssol_draw_pt.c
 | 
4
++--

1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/ssol_draw_pt.c b/src/ssol_draw_pt.c
@@ -171,7 +171,7 @@ Li
       d3_minus(N, N);
     }
 
-    surface_fragment_setup(&frag, o, wi, N, &hit.prim, hit.uv);
+    surface_fragment_setup(&frag, o, wo, N, &hit.prim, hit.uv);
     SSF(bsdf_clear(ctx->bsdf));
     CHECK(material_shade(mtl, &frag, 1/*TODO wavelength*/, ctx->bsdf), RES_OK);
 
@@ -182,12 +182,12 @@ Li
     f3_mulf(ray_dir, ray_dir, hit.distance);
     f3_add(ray_org, ray_org, ray_dir);
 
+    d3_minus(wo, wo);
     if(scn->sun) {
       L += throughput * sun_lighting
         (scn->sun, view, &ray_data, ctx->bsdf, wo, N, ray_org);
     }
 
-    d3_minus(wo, wo);
     R = ssf_bsdf_sample(ctx->bsdf, ctx->rng, wo, frag.Ns, wi, &pdf);
     ASSERT(0 <= R && R <= 1);
     f3_set_d3(ray_dir, wi);