Simplygon 10.3.2100.0

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Opacity caster ​

The OpacityCaster is used to cast opacity values, and can be used when opacity is needed as a separate texture.

The following example shows how to use the OpacityCaster to generate an opacity map.

cpp
void GenerateOpacityMap( spMaterial output_material, spMappingImage mapping_image, spMaterialTable source_materials )
{
    // Cast displacement texture data.
    spOpacityCaster cast = sg->CreateOpacityCaster();       
    cast->SetSourceMaterials( source_materials );
    cast->SetMappingImage( mapping_image );
   
    cast->SetOutputChannels( 1 ); // 1 channel
    cast->SetOutputChannelBitDepth( 8 ); // 8 bits per channel
    cast->SetOutputFilePath( "opacity_out.png" );
    cast->CastMaterials();
       
    // Set material to point to created texture filename.      
    output_material->SetTexture( SG_MATERIAL_CHANNEL_OPACITY, "opacity_out.png" );
}
csharp
void GenerateOpacityMap(spMaterial output_material, spMappingImage mapping_image, spMaterialTable source_materials)
{
    // Cast displacement texture data.
    spOpacityCaster cast = sg.CreateOpacityCaster();
    cast.SetSourceMaterials(source_materials);
    cast.SetMappingImage(mapping_image);

    cast.SetOutputChannels(1); // 1 channel
    cast.SetOutputChannelBitDepth(8); // 8 bits per channel
    cast.SetOutputFilePath("opacity_out.png");
    cast.RunProcessing();

    // Set material to point to created texture filename.      
    output_material.SetTexture(Simplygon.Simplygon.SG_MATERIAL_CHANNEL_OPACITY, "opacity_out.png");
}
python
def GenerateDisplacementMap( output_material, mapping_image, source_materials ):
    #  Cast displacement texture data.
    cast = sg.CreateOpacityCaster()       
    cast.SetSourceMaterials( source_materials )
    cast.SetMappingImage( mapping_image )
    cast.SetOutputChannels( 1 ) #  1 channel
    cast.SetOutputChannelBitDepth( 8 ) #  8 bits per channel
    cast.SetOutputFilePath( "opacity_out.png" )
    cast.CastMaterials()
       
    #  Set material to point to created texture filename.      
    output_material.SetTexture( SG_MATERIAL_CHANNEL_OPACITY, "opacity_out.png" )