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Fix NaN cause when a 0-length normal is generated and then normalized. #434

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Fix NaN cause when a 0-length normal is generated and then normalized. #434

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bf27e31
Avoid to normalize 0-length normals
FrancescoC-unity May 13, 2020
1da2f10
Changelog
FrancescoC-unity May 13, 2020
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1 change: 1 addition & 0 deletions com.unity.render-pipelines.high-definition/CHANGELOG.md
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Expand Up @@ -585,6 +585,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
- Fix error when removing DecalProjector from component contextual menu (case 1243960)
- Fixed issue with post process when running in RGBA16 and an object with additive blending is in the scene.
- Fixed corrupted values on LayeredLit when using Vertex Color multiply mode to multiply and MSAA is activated.
- Fixed a cause of NaN when a normal of 0-length is generated (usually via shadergraph).

### Changed
- Improve MIP selection for decals on Transparents
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4 changes: 2 additions & 2 deletions com.unity.render-pipelines.high-definition/Runtime/Material/MaterialUtilities.hlsl
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Expand Up @@ -32,8 +32,8 @@ void GetNormalWS(FragInputs input, float3 normalTS, out float3 normalWS, float3
normalTS.xy *= flipSign;
#endif // _DOUBLESIDED_ON

// We need to normalize as we use mikkt tangent space and this is expected (tangent space is not normalize)
normalWS = normalize(TransformTangentToWorld(normalTS, input.tangentToWorld));
// We need to normalize as we use mikkt tangent space and this is expected (tangent space is not normalized)
normalWS = SafeNormalize(TransformTangentToWorld(normalTS, input.tangentToWorld));

#endif // SURFACE_GRADIENT
}
2 changes: 1 addition & 1 deletion com.unity.shadergraph/Editor/Data/Nodes/Artistic/Normal/NormalBlendNode.cs
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Expand Up @@ -58,7 +58,7 @@ static string Unity_NormalBlend(

return @"
{
Out = normalize($precision3(A.rg + B.rg, A.b * B.b));
Out = SafeNormalize($precision3(A.rg + B.rg, A.b * B.b));
}
";
}
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2 changes: 1 addition & 1 deletion com.unity.shadergraph/Editor/Data/Nodes/Artistic/Normal/NormalFromHeightNode.cs
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Expand Up @@ -99,7 +99,7 @@ public void GenerateNodeFunction(FunctionRegistry registry, GenerationMode gener
s.AppendLine("$precision dHdx = ddx(In);");
s.AppendLine("$precision dHdy = ddy(In);");
s.AppendLine("$precision3 surfGrad = surface * (dHdx*crossY + dHdy*crossX);");
s.AppendLine("Out = normalize(TangentMatrix[2].xyz - (Strength * surfGrad));");
s.AppendLine("Out = SafeNormalize(TangentMatrix[2].xyz - (Strength * surfGrad));");

if(outputSpace == OutputSpace.Tangent)
s.AppendLine("Out = TransformWorldToTangent(Out, TangentMatrix);");
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