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MaterialX: Implement Gradient Texture node. #28

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Bogdan Nagirniak merged 6 commits from Vasyl-Pidhirskyi/blender:BLEN-550 into matx-export-material 2023-09-21 09:31:28 +02:00
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source/blender/nodes/shader/nodes/node_shader_tex_gradient.cc
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@ -177,10 +177,16 @@ NODE_SHADER_MATERIALX_BEGIN
res = vector.extract(1).atan2(vector.extract(0)) / (val(float(M_PI * 2.0f))) + val(0.5f);
break;
case SHD_BLEND_QUADRATIC_SPHERE:
/* Bias a little bit for the case where input is a unit length vector,
* to get exactly zero instead of a small random value depending
* on float precision. */
res = (val(0.999999f) - vector.dotproduct(vector).sqrt()).max(val(0.0f));
res = res * res;
break;
case SHD_BLEND_SPHERICAL:
/* Bias a little bit for the case where input is a unit length vector,
* to get exactly zero instead of a small random value depending
* on float precision. */
res = (val(0.999999f) - vector.dotproduct(vector).sqrt()).max(val(0.0f));
break;
default: