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Gaussian splat update #1570

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Merged
murraystevenson merged 2 commits into from
Oct 9, 2026
Merged

Gaussian splat update #1570

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5c9df6f
IECoreUSD : `radiance:sphericalHarmonics` suffix
ericmehl Oct 8, 2026
bfbc474
IECoreUSD : Use `float` type for all `opacities`
ericmehl Oct 8, 2026
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5 changes: 5 additions & 0 deletions Changes
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Original file line number Diff line number Diff line change
@@ -1,7 +1,12 @@
10.7.x.x (relative to 10.7.3.0)
========

Fixes
-----

- USD :
- Changed name of `ParticleField3DGaussianSplat` `radiance:sphericalHarmonicsCoefficients` primitive variables to end in `:$COEFFICIENT` instead of `[$COEFFICIENT]`.
- Changed Cortex type of `ParticleField3DGaussianSplat` `opacities` primitive variable to be `FloatVectorData` regardless of the incoming USD type (float or half).

10.7.3.0 (relative to 10.7.2.0)
========
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15 changes: 14 additions & 1 deletion contrib/IECoreUSD/src/IECoreUSD/GaussianSplatAlgo.cpp
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Expand Up @@ -97,6 +97,19 @@ IECore::ObjectPtr readGaussianSplat( pxr::UsdVolParticleField3DGaussianSplat &sp
pxr::UsdAttribute opacitiesAttr;
splats.UsesFloatOpacities( &opacitiesAttr );
PrimitiveAlgo::readPrimitiveVariable( opacitiesAttr, time, newPoints.get(), "opacities" );
if( auto opacitiesHalfData = newPoints->variableData<HalfVectorData>( "opacities" ) )
{
// Cortex has HalfVectorData which supports half opacities. For consistency with
// other attributes and downstream clients, we convert to float.

const std::vector<half> &opacitiesHalf = opacitiesHalfData->readable();

FloatVectorDataPtr opacitiesData = new FloatVectorData();
opacitiesData->writable().insert( opacitiesData->writable().end(), opacitiesHalf.begin(), opacitiesHalf.end() );

PrimitiveVariable v = PrimitiveVariable( PrimitiveVariable::Interpolation::Vertex, opacitiesData );
newPoints->variables["opacities"] = v;
}

Canceller::check( canceller );
pxr::UsdAttribute degreeAttr = splats.GetRadianceSphericalHarmonicsDegreeAttr();
Expand Down Expand Up @@ -126,7 +139,7 @@ IECore::ObjectPtr readGaussianSplat( pxr::UsdVolParticleField3DGaussianSplat &sp
coefficients[j] = allCoefficients[j * coefficientCount + i];
}

newPoints->variables[fmt::format( "radiance:sphericalHarmonicsCoefficients[{}]", i )] = PrimitiveVariable( PrimitiveVariable::Interpolation::Vertex, coefficientsData );
newPoints->variables[fmt::format( "radiance:sphericalHarmonicsCoefficients:{}", i )] = PrimitiveVariable( PrimitiveVariable::Interpolation::Vertex, coefficientsData );
}
}

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4 changes: 2 additions & 2 deletions contrib/IECoreUSD/test/IECoreUSD/USDSceneTest.py
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Expand Up @@ -5175,7 +5175,7 @@ def testReadGaussianSplats( self ) :
( "P", IECore.V3fVectorData, IECore.GeometricData.Interpretation.Point, 4 ),
( "orientations", IECore.QuatfVectorData, None, 4 ),
( "scales", IECore.V3fVectorData, IECore.GeometricData.Interpretation.Numeric, 4 ),
( "opacities", IECore.FloatVectorData if sceneFile == "gaussianSplatsFloat.usda" else IECore.HalfVectorData, None, 4 ),
( "opacities", IECore.FloatVectorData, None, 4 ),
( "radiance:sphericalHarmonicsDegree", IECore.IntData, None, None ),
] :
with self.subTest( variable = variable ) :
Expand All @@ -5186,7 +5186,7 @@ def testReadGaussianSplats( self ) :
self.assertEqual( len( splats[variable].data ), vectorLength )

for i in range( 0, 4 ) : # degree = 1, count = ( degree + 1 ) * ( degree + 1 )
variable = "radiance:sphericalHarmonicsCoefficients[{}]".format( i )
variable = "radiance:sphericalHarmonicsCoefficients:{}".format( i )
self.assertIsInstance( splats[variable].data, IECore.V3fVectorData )
self.assertEqual( splats[variable].data.getInterpretation(), IECore.GeometricData.Interpretation.None_ )
self.assertEqual( len( splats[variable].data ), 4 )
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