do not check child nodes of a node at which the distance to the bounding box is further than a triangle the ray/photon has already intersected

1 files changed, 4 insertions, 2 deletions

diff --git a/src/intersect.h b/src/intersect.h
index c400f1c..d2f54ce 100644
--- a/src/intersect.h
+++ b/src/intersect.h
@@ -60,7 +60,7 @@ __device__ bool intersect_triangle(const float3 &origin, const float3 &direction
    angle between the ray and the plane normal to determine the brightness.
 
    `direction` must be normalized. */
-__device__ int get_color(const float3 &direction, const float3 &v0, const float3& v1, const float3 &v2, const int base_color=0xFFFFFFFF)
+__device__ unsigned int get_color(const float3 &direction, const float3 &v0, const float3& v1, const float3 &v2, const unsigned int base_color=0xFFFFFFFF)
 {
 	float scale = dot(normalize(cross(v1-v0,v2-v1)),-direction);
 
@@ -82,7 +82,7 @@ __device__ int get_color(const float3 &direction, const float3 &v0, const float3
    direction `direction` and the axis-aligned box defined by the opposite
    vertices `lower_bound` and `upper_bound`. If the ray intersects the box
    return True, else return False. */
-__device__ bool intersect_box(const float3 &origin, const float3 &direction, const float3 &lower_bound, const float3 &upper_bound)
+__device__ bool intersect_box(const float3 &origin, const float3 &direction, const float3 &lower_bound, const float3 &upper_bound, float& distance_to_box)
 {
 	float kmin, kmax, kymin, kymax, kzmin, kzmax;
 
@@ -149,6 +149,8 @@ __device__ bool intersect_box(const float3 &origin, const float3 &direction, con
 	if (kmin > kmax)
 		return false;
 
+	distance_to_box = kmin;
+
 	return true;
 }