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Hair Info Length Attribute

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Goal is to add the length attribute to the Hair Info node, for better control over color gradients or similar along the hair.

Reviewed By: #eevee_viewport, brecht

Differential Revision: https://developer.blender.org/D10481
This commit is contained in:
Jeroen Bakker
2021-09-24 07:42:36 +02:00
committed by Jeroen Bakker
parent 0f764ade1a
commit 6a88f83d67
26 changed files with 228 additions and 68 deletions
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7
source/blender/nodes/shader/nodes/node_shader_hair_info.c
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@@ -22,6 +22,7 @@
static bNodeSocketTemplate outputs[] = {
{SOCK_FLOAT, N_("Is Strand"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
{SOCK_FLOAT, N_("Intercept"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
{SOCK_FLOAT, N_("Length"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
{SOCK_FLOAT, N_("Thickness"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
{SOCK_VECTOR, N_("Tangent Normal"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
// { SOCK_FLOAT, 0, N_("Fade"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
@@ -35,7 +36,11 @@ static int node_shader_gpu_hair_info(GPUMaterial *mat,
GPUNodeStack *in,
GPUNodeStack *out)
{
return GPU_stack_link(mat, node, "node_hair_info", in, out);
/* Length: don't request length if not needed. */
const static float zero = 0;
GPUNodeLink *length_link = (!out[2].hasoutput) ? GPU_constant(&zero) :
GPU_attribute(mat, CD_HAIRLENGTH, "");
return GPU_stack_link(mat, node, "node_hair_info", in, out, length_link);
}
/* node type definition */