hybrid monte carlo render now distinguishes between the two different sides of each triangle. reduced the number of runs to average when propagating photons from each pixel in render.py from 5 to 1; the speed improvement outweighs any small improvement in the quality of the rendered image.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/photon.h b/src/photon.h
index 69ecd34..11bcfc1 100644
--- a/src/photon.h
+++ b/src/photon.h
@@ -25,6 +25,8 @@ struct Photon
 
 struct State
 {
+	bool inside_to_outside;
+
 	float3 surface_normal;
 
 	float refractive_index1, refractive_index2;
@@ -78,6 +80,8 @@ __device__ int fill_state(State &s, Photon &p)
 		// outside to inside
 		material1 = materials[outer_material_index];
 		material2 = materials[inner_material_index];
+
+		s.inside_to_outside = false;
 	}
 	else
 	{
@@ -85,6 +89,8 @@ __device__ int fill_state(State &s, Photon &p)
 		material1 = materials[inner_material_index];
 		material2 = materials[outer_material_index];
 		s.surface_normal = -s.surface_normal;
+
+		s.inside_to_outside = true;
 	}
 
 	s.refractive_index1 = interp_property(p.wavelength, material1.refractive_index);