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Cycles: initial subsurface multiple scattering support. It's not working as

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well as I would like, but it works, just add a subsurface scattering node and
you can use it like any other BSDF.

It is using fully raytraced sampling compatible with progressive rendering
and other more advanced rendering algorithms we might used in the future, and
it uses no extra memory so it's suitable for complex scenes.

Disadvantage is that it can be quite noisy and slow. Two limitations that will
be solved are that it does not work with bump mapping yet, and that the falloff
function used is a simple cubic function, it's not using the real BSSRDF
falloff function yet.

The node has a color input, along with a scattering radius for each RGB color
channel along with an overall scale factor for the radii.

There is also no GPU support yet, will test if I can get that working later.

Node Documentation:
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Shaders#BSSRDF

Implementation notes:
http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles/Subsurface_Scattering
This commit is contained in:
Brecht Van Lommel
2013-04-01 20:26:52 +00:00
parent 40b05d364e
commit de9dffc61e
55 changed files with 1806 additions and 254 deletions
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53
intern/cycles/kernel/svm/svm_closure.h
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@@ -306,6 +306,59 @@ __device void svm_node_closure_bsdf(KernelGlobals *kg, ShaderData *sd, float *st
}
break;
}
#ifdef __SUBSURFACE__
case CLOSURE_BSSRDF_ID: {
ShaderClosure *sc = &sd->closure[sd->num_closure];
float3 weight = sc->weight * mix_weight;
float sample_weight = fabsf(average(weight));
if(sample_weight > 1e-5f && sd->num_closure+2 < MAX_CLOSURE) {
/* radius * scale */
float3 radius = stack_load_float3(stack, data_node.w)*param1;
/* index of refraction */
float eta = fmaxf(param2, 1.0f + 1e-5f);
/* create one closure per color channel */
if(fabsf(weight.x) > 0.0f) {
sc->weight = make_float3(weight.x, 0.0f, 0.0f);
sc->sample_weight = sample_weight;
sc->data0 = radius.x;
sc->data1 = eta;
sc->N = N;
sd->flag |= bssrdf_setup(sc);
sd->num_closure++;
sc++;
}
if(fabsf(weight.y) > 0.0f) {
sc->weight = make_float3(0.0f, weight.y, 0.0f);
sc->sample_weight = sample_weight;
sc->data0 = radius.y;
sc->data1 = eta;
sc->N = N;
sd->flag |= bssrdf_setup(sc);
sd->num_closure++;
sc++;
}
if(fabsf(weight.z) > 0.0f) {
sc->weight = make_float3(0.0f, 0.0f, weight.z);
sc->sample_weight = sample_weight;
sc->data0 = radius.z;
sc->data1 = eta;
sc->N = N;
sd->flag |= bssrdf_setup(sc);
sd->num_closure++;
sc++;
}
}
break;
}
#endif
default:
break;
}