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Ternary : Clamp texture coordinates to avoid texture edge issues

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This commit is contained in:
Magne Sjaastad 2014-10-28 09:39:26 +01:00
parent da31522ae9
commit 55b5da018c
1 changed files with 15 additions and 11 deletions
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26
ApplicationCode/ModelVisualization/RivTernaryScalarMapper.cpp
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@ -37,20 +37,24 @@ RivTernaryScalarMapper::RivTernaryScalarMapper(const cvf::Color3f& undefScalarCo
//--------------------------------------------------------------------------------------------------
cvf::Vec2f RivTernaryScalarMapper::mapToTextureCoord(double soil, double sgas, bool isTransparent) const
{
double soilNormalized = (soil - m_rangeMinSoil) * m_soilFactor;
soilNormalized = cvf::Math::clamp(soilNormalized, 0.0, 1.0);
// Clamp the float texture coordinate to avoid edge issues when looking up the texture coordinate
// The issue was detected on Linux, no similar issues has been seen on Windows
double edgeClampDelta = 0.001;
double sgasNormalized = (sgas - m_rangeMinSgas) * m_sgasFactor;
sgasNormalized = cvf::Math::clamp(sgasNormalized, 0.0, 1.0 - soilNormalized);
sgasNormalized /= 2.0;
double soilNormalized = (soil - m_rangeMinSoil) * m_soilFactor;
soilNormalized = cvf::Math::clamp(soilNormalized, edgeClampDelta, 1.0 - edgeClampDelta);
if (isTransparent)
{
sgasNormalized += 0.5;
}
double sgasNormalized = (sgas - m_rangeMinSgas) * m_sgasFactor;
sgasNormalized = cvf::Math::clamp(sgasNormalized, edgeClampDelta, 1.0 - soilNormalized);
sgasNormalized /= 2.0;
cvf::Vec2f texCoord(static_cast<float>(soilNormalized), static_cast<float>(sgasNormalized));
return texCoord;
if (isTransparent)
{
sgasNormalized += 0.5;
}
cvf::Vec2f texCoord(static_cast<float>(soilNormalized), static_cast<float>(sgasNormalized));
return texCoord;
}
//--------------------------------------------------------------------------------------------------