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Cycles: add Ray Length output to Light Path node. This gives the distance travelled

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by the last light ray. One use case for this might be to do absorption.

Patch #31232 by Agustin benavidez, see this blog post for details:
http://agus3d.blogspot.com.ar/2012/05/blender-cycles-ray-length-node-output.html
This commit is contained in:
Brecht Van Lommel
2012-05-02 17:03:46 +00:00
parent 89f554fd24
commit d64661b507
7 changed files with 23 additions and 6 deletions
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7
intern/cycles/kernel/kernel_shader.h
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@@ -77,6 +77,7 @@ __device_inline void shader_setup_from_ray(KernelGlobals *kg, ShaderData *sd,
sd->N = Ng;
sd->I = -ray->D;
sd->shader = shader;
sd->ray_length = isect->t;
/* smooth normal */
if(sd->shader & SHADER_SMOOTH_NORMAL)
@@ -127,7 +128,7 @@ __device_inline void shader_setup_from_ray(KernelGlobals *kg, ShaderData *sd,
__device void shader_setup_from_sample(KernelGlobals *kg, ShaderData *sd,
const float3 P, const float3 Ng, const float3 I,
int shader, int object, int prim, float u, float v, float time)
int shader, int object, int prim, float u, float v, float t, float time)
{
/* vectors */
sd->P = P;
@@ -145,6 +146,7 @@ __device void shader_setup_from_sample(KernelGlobals *kg, ShaderData *sd,
sd->u = u;
sd->v = v;
#endif
sd->ray_length = t;
/* detect instancing, for non-instanced the object index is -object-1 */
#ifdef __INSTANCING__
@@ -242,7 +244,7 @@ __device void shader_setup_from_displace(KernelGlobals *kg, ShaderData *sd,
/* watch out: no instance transform currently */
shader_setup_from_sample(kg, sd, P, Ng, I, shader, object, prim, u, v, TIME_INVALID);
shader_setup_from_sample(kg, sd, P, Ng, I, shader, object, prim, u, v, 0.0f, TIME_INVALID);
}
/* ShaderData setup from ray into background */
@@ -259,6 +261,7 @@ __device_inline void shader_setup_from_background(KernelGlobals *kg, ShaderData
#ifdef __MOTION__
sd->time = ray->time;
#endif
sd->ray_length = 0.0f;
#ifdef __INSTANCING__
sd->object = ~0;