New feature

Patch [#33445] - Experimental Cycles Hair Rendering (CPU only)

This patch allows hair data to be exported to cycles and introduces a new line segment primitive to render with.

The UI appears under the particle tab and there is a new hair info node available.

It is only available under the experimental feature set and for cpu rendering.

1 files changed, 11 insertions, 1 deletions

diff --git a/intern/cycles/kernel/kernel_emission.h b/intern/cycles/kernel/kernel_emission.h
index e56633c9358..adf7e8eca82 100644
--- a/intern/cycles/kernel/kernel_emission.h
+++ b/intern/cycles/kernel/kernel_emission.h
@@ -47,7 +47,13 @@ __device float3 direct_emissive_eval(KernelGlobals *kg, float rando,
 	else
 #endif
 	{
-		shader_setup_from_sample(kg, &sd, ls->P, ls->Ng, I, ls->shader, ls->object, ls->prim, u, v, t, time);
+#ifdef __HAIR__
+		if(ls->type == LIGHT_STRAND)
+			shader_setup_from_sample(kg, &sd, ls->P, ls->Ng, I, ls->shader, ls->object, ls->prim, u, v, t, time, ls->prim);
+		else
+#endif
+			shader_setup_from_sample(kg, &sd, ls->P, ls->Ng, I, ls->shader, ls->object, ls->prim, u, v, t, time);
+
 		ls->Ng = sd.Ng;
 
 		/* no path flag, we're evaluating this for all closures. that's weak but
@@ -150,7 +156,11 @@ __device float3 indirect_emission(KernelGlobals *kg, ShaderData *sd, float t, in
 	/* evaluate emissive closure */
 	float3 L = shader_emissive_eval(kg, sd);
 
+#ifdef __HAIR__
+	if(!(path_flag & PATH_RAY_MIS_SKIP) && (sd->flag & SD_SAMPLE_AS_LIGHT) && (sd->curve_seg == ~0)) {
+#else
 	if(!(path_flag & PATH_RAY_MIS_SKIP) && (sd->flag & SD_SAMPLE_AS_LIGHT)) {
+#endif
 		/* multiple importance sampling, get triangle light pdf,
 		 * and compute weight with respect to BSDF pdf */
 		float pdf = triangle_light_pdf(kg, sd->Ng, sd->I, t);