Eevee: SSS: Add Christensen-Burley diffusion profile.

This seems to be a correct implementation of the same diffusion profile as Cycles uses by default.

There are a few bias though:
- We consider _A_ the albedo to be 1 when evaluating _s_.
- We use a factor of 0.6 when computing _d_ to match more or less cycles results.

Note that doing per pixel jittering does bias the result even further (loss of energy).

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/nodes/shader/nodes/node_shader_subsurface_scattering.c b/source/blender/nodes/shader/nodes/node_shader_subsurface_scattering.c
index 4321c47a092..153c674236c 100644
--- a/source/blender/nodes/shader/nodes/node_shader_subsurface_scattering.c
+++ b/source/blender/nodes/shader/nodes/node_shader_subsurface_scattering.c
@@ -58,7 +58,7 @@ static int node_shader_gpu_subsurface_scattering(GPUMaterial *mat, bNode *node,
 		bNodeSocket *socket = BLI_findlink(&node->original->inputs, 2);
 		bNodeSocketValueRGBA *socket_data = socket->default_value;
 		/* For some reason it seems that the socket value is in ARGB format. */
-		GPU_material_sss_profile_create(mat, &socket_data->value[1]);
+		GPU_material_sss_profile_create(mat, &socket_data->value[1], &node->original->custom1);
 	}
 
 	return GPU_stack_link(mat, node, "node_subsurface_scattering", in, out, GPU_uniform(&node->sss_id));