Method doConversion

src/IECoreGL/ToGLCurvesConverter.cpp:106–157

};

IECore::RunTimeTypedPtr ToGLCurvesConverter::doConversion( IECore::ConstObjectPtr src, IECore::ConstCompoundObjectPtr operands ) const
{
	IECoreScene::CurvesPrimitive::ConstPtr curves = boost::static_pointer_cast<const IECoreScene::CurvesPrimitive>( src ); // safe because the parameter validated it for us

	IECore::V3fVectorData::ConstPtr points = curves->variableData<IECore::V3fVectorData>( "P", IECoreScene::PrimitiveVariable::Vertex );
	if( !points )
	{
		throw IECore::Exception( "Must specify primitive variable \"P\", of type V3fVectorData and interpolation type Vertex." );
	}

	IECore::FloatData::ConstPtr widthData = curves->variableData<IECore::FloatData>( "width", IECoreScene::PrimitiveVariable::Constant );
	if( !widthData  )
	{
		widthData = curves->variableData<IECore::FloatData>( "constantwidth", IECoreScene::PrimitiveVariable::Constant );
	}

	float width = 1;
	if( widthData )
	{
		width = widthData->readable();
	}

	CurvesPrimitive::Ptr result = new CurvesPrimitive( curves->basis(), curves->periodic(), curves->verticesPerCurve(), width );

	for ( IECoreScene::PrimitiveVariableMap::const_iterator pIt = curves->variables.begin(); pIt != curves->variables.end(); ++pIt )
	{
		if( !pIt->second.data )
		{
			IECore::msg( IECore::Msg::Warning, "ToGLCurvesConverter", boost::format( "No data given for primvar \"%s\"" ) % pIt->first );
			continue;
		}

		if( pIt->second.interpolation == IECoreScene::PrimitiveVariable::Vertex || pIt->second.interpolation == IECoreScene::PrimitiveVariable::Constant )
		{
			result->addPrimitiveVariable( pIt->first, pIt->second );
		}
		else if( pIt->second.interpolation == IECoreScene::PrimitiveVariable::Uniform )
		{
			ToVertexConverter converter( curves->verticesPerCurve()->readable(), curves->variableSize( IECoreScene::PrimitiveVariable::Vertex ), 1 );
			// todo : convert to Vertex interpolation using indices if they exist. For now we just expand the data.
			// todo : Note  crash was discovered when converting a indexed uniform string primvar for viewport rendering - can we do anything with this data?
			auto expandedData = pIt->second.expandedData();
			IECore::DataPtr newData = IECore::despatchTypedData<ToVertexConverter, IECore::TypeTraits::IsVectorTypedData>( expandedData.get(), converter );
			if( newData )
			{
				result->addPrimitiveVariable( pIt->first, IECoreScene::PrimitiveVariable( IECoreScene::PrimitiveVariable::Vertex, newData ) );
			}
		}
	}

	return result;
}