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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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1 changed files with 2 additions and 8 deletions
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source/blender/nodes/shader/nodes/node_shader_tex_gradient.cc
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@ -177,17 +177,11 @@ NODE_SHADER_MATERIALX_BEGIN
res = vector.extract(1).atan2(vector.extract(0)) / (val(float(M_PI * 2.0f))) + val(0.5f); res = vector.extract(1).atan2(vector.extract(0)) / (val(float(M_PI * 2.0f))) + val(0.5f);
break; break;
case SHD_BLEND_QUADRATIC_SPHERE: case SHD_BLEND_QUADRATIC_SPHERE:
/* Bias a little bit for the case where input is a unit length vector, res = (val(1.0f) - vector.dotproduct(vector).sqrt()).max(val(0.0f));
* 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; res = res * res;
break; break;
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Bogdan Nagirniak commented 2023-09-20 13:49:30 +02:00
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use res = res.dotproduct(res).sqrt()

use `res = res.dotproduct(res).sqrt()`
case SHD_BLEND_SPHERICAL: case SHD_BLEND_SPHERICAL:
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Bogdan Nagirniak commented 2023-09-20 13:34:51 +02:00
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Why not 1.0f? Need comment why 0.999999f is used instead of 1.0f

Why not 1.0f? Need comment why 0.999999f is used instead of 1.0f
Vasyl Pidhirskyi commented 2023-09-20 17:03:29 +02:00
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It's made according to Blender's implementation.

          /* 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. */
          const float r = std::max(0.999999f - math::length(vector[i]), 0.0f);
It's made according to Blender's implementation. ``` /* 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. */ const float r = std::max(0.999999f - math::length(vector[i]), 0.0f); ```
Vasyl Pidhirskyi commented 2023-09-20 17:52:38 +02:00
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Added comment

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/* Bias a little bit for the case where input is a unit length vector, res = (val(1.0f) - vector.dotproduct(vector).sqrt()).max(val(0.0f));
* 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; break;
default: default:
BLI_assert_unreachable(); BLI_assert_unreachable();