This example shows how to use Simplygon shading network with a custom shading node.

// Copyright (c) Microsoft Corporation. 
// Licensed under the MIT License. 

#include <string>
#include <stdlib.h>
#include <filesystem>
#include <future>
#include "SimplygonLoader.h"

class CustomObserver : public Simplygon::Observer
{
	public:
	Simplygon::ShadingColor OnShadingCustomNodeEvaluate(Simplygon::spObject subject) override
	{
		Simplygon::ShadingColor outputValue( 0.0f, 0.0f, 0.0f, 1.0f );
		if (!subject.IsNull())
		{
			Simplygon::spShadingCustomNode customNode = Simplygon::spShadingCustomNode::SafeCast(subject);
			if (!customNode.IsNull())
			{
				Simplygon::ShadingColor inputValue = customNode->GetInputValue(0);
				outputValue.r = inputValue.r * 0.393f + inputValue.g * 0.769f + inputValue.b * 0.189f;
				outputValue.g = inputValue.r * 0.349f + inputValue.g * 0.686f + inputValue.b * 0.168f;
				outputValue.b = inputValue.r * 0.272f + inputValue.g * 0.534f + inputValue.b * 0.131f;
			}
		}
		return outputValue;
	}
	bool OnShadingCustomNodeGenerateShaderCode(Simplygon::spObject subject, Simplygon::EShaderLanguage shaderLanguage) override
	{
		if (!subject.IsNull())
		{
			Simplygon::spShadingCustomNode customNode = Simplygon::spShadingCustomNode::SafeCast(subject);
			if (!customNode.IsNull())
			{
				customNode->SetCustomShaderCode( "result = float4(dot(rgba_custom_input_0, float3(0.393f, 0.769f, 0.189f)), dot(rgba_custom_input_0, float3(0.349f, 0.686f, 0.168f)), dot(rgba_custom_input_0, float3(0.272f, 0.534f, 0.131f)), 1.0f);");
				return true;
			}
		}
		return false;
	}
} customObserver;


Simplygon::spScene LoadScene(Simplygon::ISimplygon* sg, const char* path)
{
	// Create scene importer 
	Simplygon::spSceneImporter sgSceneImporter = sg->CreateSceneImporter();
	sgSceneImporter->SetImportFilePath(path);
	
	// Run scene importer. 
	bool importResult = sgSceneImporter->RunImport();
	if (!importResult)
	{
		throw std::exception("Failed to load scene.");
	}
	Simplygon::spScene sgScene = sgSceneImporter->GetScene();
	return sgScene;
}

void SaveScene(Simplygon::ISimplygon* sg, Simplygon::spScene sgScene, const char* path)
{
	// Create scene exporter. 
	Simplygon::spSceneExporter sgSceneExporter = sg->CreateSceneExporter();
	sgSceneExporter->SetExportFilePath(path);
	sgSceneExporter->SetScene(sgScene);
	
	// Run scene exporter. 
	bool exportResult = sgSceneExporter->RunExport();
	if (!exportResult)
	{
		throw std::exception("Failed to save scene.");
	}
}

void CheckLog(Simplygon::ISimplygon* sg)
{
	// Check if any errors occurred. 
	bool hasErrors = sg->ErrorOccurred();
	if (hasErrors)
	{
		Simplygon::spStringArray errors = sg->CreateStringArray();
		sg->GetErrorMessages(errors);
		auto errorCount = errors->GetItemCount();
		if (errorCount > 0)
		{
			printf("%s\n", "Errors:");
			for (auto errorIndex = 0U; errorIndex < errorCount; ++errorIndex)
			{
				Simplygon::spString errorString = errors->GetItem((int)errorIndex);
				printf("%s\n", errorString.c_str());
			}
			sg->ClearErrorMessages();
		}
	}
	else
	{
		printf("%s\n", "No errors.");
	}
	
	// Check if any warnings occurred. 
	bool hasWarnings = sg->WarningOccurred();
	if (hasWarnings)
	{
		Simplygon::spStringArray warnings = sg->CreateStringArray();
		sg->GetWarningMessages(warnings);
		auto warningCount = warnings->GetItemCount();
		if (warningCount > 0)
		{
			printf("%s\n", "Warnings:");
			for (auto warningIndex = 0U; warningIndex < warningCount; ++warningIndex)
			{
				Simplygon::spString warningString = warnings->GetItem((int)warningIndex);
				printf("%s\n", warningString.c_str());
			}
			sg->ClearWarningMessages();
		}
	}
	else
	{
		printf("%s\n", "No warnings.");
	}
}

void RunReductionWithShadingNetworks(Simplygon::ISimplygon* sg)
{
	// Load scene to process. 	
	printf("%s\n", "Load scene to process.");
	Simplygon::spScene sgScene = LoadScene(sg, "../../../Assets/SimplygonMan/SimplygonMan.obj");
	Simplygon::spReductionProcessor sgReductionProcessor = sg->CreateReductionProcessor();
	sgReductionProcessor->SetScene( sgScene );
	Simplygon::spReductionSettings sgReductionSettings = sgReductionProcessor->GetReductionSettings();
	Simplygon::spMappingImageSettings sgMappingImageSettings = sgReductionProcessor->GetMappingImageSettings();
	
	// Generates a mapping image which is used after the reduction to cast new materials to the new 
	// reduced object. 
	sgMappingImageSettings->SetGenerateMappingImage( true );
	sgMappingImageSettings->SetApplyNewMaterialIds( true );
	sgMappingImageSettings->SetGenerateTangents( true );
	sgMappingImageSettings->SetUseFullRetexturing( true );
	
	// Inject a sepia filter as a custom shading node into the shading network for the diffuse channel 
	// for each material in the scene. 
	int materialCount = (int)sgScene->GetMaterialTable()->GetMaterialsCount();
	for (int i = 0; i < materialCount; ++i)
	{
		Simplygon::spMaterial sgSepiaMaterial = sgScene->GetMaterialTable()->GetMaterial(i);

		Simplygon::spShadingNode sgMaterialShadingNode = sgSepiaMaterial->GetShadingNetwork("Diffuse");
		Simplygon::spShadingCustomNode sgSepiaNode = sg->CreateShadingCustomNode();

		// Add the custom observer to our custom shading node.
		sgSepiaNode->AddObserver(&customObserver);
		
		// Set the number of input slots to the custom node. In this case we only use the diffuse color from the loaded material as input.
		sgSepiaNode->SetInputCount(1);


		sgSepiaNode->SetInput(0, sgMaterialShadingNode);

		sgSepiaMaterial->SetShadingNetwork("Diffuse", sgSepiaNode);
	}
	
	// Start the reduction process. 	
	printf("%s\n", "Start the reduction process.");
	sgReductionProcessor->RunProcessing();
	
	// Setup and run the diffuse material casting. 	
	printf("%s\n", "Setup and run the diffuse material casting.");
	Simplygon::spColorCaster sgDiffuseCaster = sg->CreateColorCaster();
	sgDiffuseCaster->SetMappingImage( sgReductionProcessor->GetMappingImage() );
	sgDiffuseCaster->SetSourceMaterials( sgScene->GetMaterialTable() );
	sgDiffuseCaster->SetSourceTextures( sgScene->GetTextureTable() );
	sgDiffuseCaster->SetOutputFilePath( "DiffuseTexture" );

	Simplygon::spColorCasterSettings sgDiffuseCasterSettings = sgDiffuseCaster->GetColorCasterSettings();
	sgDiffuseCasterSettings->SetMaterialChannel( "Diffuse" );
	sgDiffuseCasterSettings->SetOutputImageFileFormat( Simplygon::EImageOutputFormat::PNG );

	sgDiffuseCaster->RunProcessing();
	std::string diffuseTextureFilePath = sgDiffuseCaster->GetOutputFilePath();
	
	// Update scene with new casted texture. 
	Simplygon::spMaterialTable sgMaterialTable = sg->CreateMaterialTable();
	Simplygon::spTextureTable sgTextureTable = sg->CreateTextureTable();
	Simplygon::spMaterial sgMaterial = sg->CreateMaterial();
	Simplygon::spTexture sgDiffuseTexture = sg->CreateTexture();
	sgDiffuseTexture->SetName( "Diffuse" );
	sgDiffuseTexture->SetFilePath( diffuseTextureFilePath.c_str() );
	sgTextureTable->AddTexture( sgDiffuseTexture );

	Simplygon::spShadingTextureNode sgDiffuseTextureShadingNode = sg->CreateShadingTextureNode();
	sgDiffuseTextureShadingNode->SetTexCoordLevel( 0 );
	sgDiffuseTextureShadingNode->SetTextureName( "Diffuse" );

	sgMaterial->AddMaterialChannel( "Diffuse" );
	sgMaterial->SetShadingNetwork( "Diffuse", sgDiffuseTextureShadingNode );

	sgMaterialTable->AddMaterial( sgMaterial );

	sgScene->GetTextureTable()->Clear();
	sgScene->GetMaterialTable()->Clear();
	sgScene->GetTextureTable()->Copy(sgTextureTable);
	sgScene->GetMaterialTable()->Copy(sgMaterialTable);
	
	// Save processed scene. 	
	printf("%s\n", "Save processed scene.");
	SaveScene(sg, sgScene, "Output.fbx");
	
	// Check log for any warnings or errors. 	
	printf("%s\n", "Check log for any warnings or errors.");
	CheckLog(sg);
}

int main()
{
	Simplygon::ISimplygon* sg = NULL;
	Simplygon::EErrorCodes initval = Simplygon::Initialize( &sg );
	if( initval != Simplygon::EErrorCodes::NoError )
	{
		printf( "Failed to initialize Simplygon: ErrorCode(%d)", (int)initval );
		return int(initval);
	}

	RunReductionWithShadingNetworks(sg);

	Simplygon::Deinitialize(sg);

	return 0;
}

// Copyright (c) Microsoft Corporation. 
// Licensed under the MIT License. 

using System;
using System.IO;
using System.Threading.Tasks;

public class CustomObserver : Simplygon.Observer
{
    public override Simplygon.ShadingColor OnShadingCustomNodeEvaluate(Simplygon.spObject subject)
    {
        Simplygon.ShadingColor outputValue = new Simplygon.ShadingColor( 0.0f, 0.0f, 0.0f, 1.0f );
        if (!subject.IsNull())
        {
            Simplygon.spShadingCustomNode customNode = Simplygon.spShadingCustomNode.SafeCast(subject);
            if (!customNode.IsNull())
            {
                Simplygon.ShadingColor inputValue = customNode.GetInputValue(0);
                outputValue.r = inputValue.r * 0.393f + inputValue.g * 0.769f + inputValue.b * 0.189f;
                outputValue.g = inputValue.r * 0.349f + inputValue.g * 0.686f + inputValue.b * 0.168f;
                outputValue.b = inputValue.r * 0.272f + inputValue.g * 0.534f + inputValue.b * 0.131f;
            }
        }
        return outputValue;
    }
    public override bool OnShadingCustomNodeGenerateShaderCode(Simplygon.spObject subject, Simplygon.EShaderLanguage shaderLanguage)
    {
        if (!subject.IsNull())
        {
            Simplygon.spShadingCustomNode customNode = Simplygon.spShadingCustomNode.SafeCast(subject);
            if (!customNode.IsNull())
            {
                customNode.SetCustomShaderCode( "result = float4(dot(rgba_custom_input_0, float3(0.393f, 0.769f, 0.189f)), dot(rgba_custom_input_0, float3(0.349f, 0.686f, 0.168f)), dot(rgba_custom_input_0, float3(0.272f, 0.534f, 0.131f)), 1.0f);");
                return true;
            }
        }
        return false;
    }
}

public class Program
{
    static private CustomObserver customObserver;

    static Simplygon.spScene LoadScene(Simplygon.ISimplygon sg, string path)
    {
        // Create scene importer 
        using Simplygon.spSceneImporter sgSceneImporter = sg.CreateSceneImporter();
        sgSceneImporter.SetImportFilePath(path);
        
        // Run scene importer. 
        bool importResult = sgSceneImporter.RunImport();
        if (!importResult)
        {
            throw new System.Exception("Failed to load scene.");
        }
        Simplygon.spScene sgScene = sgSceneImporter.GetScene();
        return sgScene;
    }
    static void SaveScene(Simplygon.ISimplygon sg, Simplygon.spScene sgScene, string path)
    {
        // Create scene exporter. 
        using Simplygon.spSceneExporter sgSceneExporter = sg.CreateSceneExporter();
        sgSceneExporter.SetExportFilePath(path);
        sgSceneExporter.SetScene(sgScene);
        
        // Run scene exporter. 
        bool exportResult = sgSceneExporter.RunExport();
        if (!exportResult)
        {
            throw new System.Exception("Failed to save scene.");
        }
    }
    static void CheckLog(Simplygon.ISimplygon sg)
    {
        // Check if any errors occurred. 
        bool hasErrors = sg.ErrorOccurred();
        if (hasErrors)
        {
            Simplygon.spStringArray errors = sg.CreateStringArray();
            sg.GetErrorMessages(errors);
            var errorCount = errors.GetItemCount();
            if (errorCount > 0)
            {
                Console.WriteLine("Errors:");
                for (uint errorIndex = 0; errorIndex < errorCount; ++errorIndex)
                {
                    string errorString = errors.GetItem((int)errorIndex);
                    Console.WriteLine(errorString);
                }
                sg.ClearErrorMessages();
            }
        }
        else
        {
            Console.WriteLine("No errors.");
        }
        
        // Check if any warnings occurred. 
        bool hasWarnings = sg.WarningOccurred();
        if (hasWarnings)
        {
            Simplygon.spStringArray warnings = sg.CreateStringArray();
            sg.GetWarningMessages(warnings);
            var warningCount = warnings.GetItemCount();
            if (warningCount > 0)
            {
                Console.WriteLine("Warnings:");
                for (uint warningIndex = 0; warningIndex < warningCount; ++warningIndex)
                {
                    string warningString = warnings.GetItem((int)warningIndex);
                    Console.WriteLine(warningString);
                }
                sg.ClearWarningMessages();
            }
        }
        else
        {
            Console.WriteLine("No warnings.");
        }
    }
    static void RunReductionWithShadingNetworks(Simplygon.ISimplygon sg)
    {
        // Load scene to process.         
        Console.WriteLine("Load scene to process.");
        Simplygon.spScene sgScene = LoadScene(sg, "../../../Assets/SimplygonMan/SimplygonMan.obj");
        using Simplygon.spReductionProcessor sgReductionProcessor = sg.CreateReductionProcessor();
        sgReductionProcessor.SetScene( sgScene );
        using Simplygon.spReductionSettings sgReductionSettings = sgReductionProcessor.GetReductionSettings();
        using Simplygon.spMappingImageSettings sgMappingImageSettings = sgReductionProcessor.GetMappingImageSettings();
        
        // Generates a mapping image which is used after the reduction to cast new materials to the new 
        // reduced object. 
        sgMappingImageSettings.SetGenerateMappingImage( true );
        sgMappingImageSettings.SetApplyNewMaterialIds( true );
        sgMappingImageSettings.SetGenerateTangents( true );
        sgMappingImageSettings.SetUseFullRetexturing( true );
        
        // Inject a sepia filter as a custom shading node into the shading network for the diffuse channel 
        // for each material in the scene. 
        int materialCount = (int)sgScene.GetMaterialTable().GetMaterialsCount();
        for (int i = 0; i < materialCount; ++i)
        {
            Simplygon.spMaterial sgSepiaMaterial = sgScene.GetMaterialTable().GetMaterial(i);

            using Simplygon.spShadingNode sgMaterialShadingNode = sgSepiaMaterial.GetShadingNetwork("Diffuse");
            using Simplygon.spShadingCustomNode sgSepiaNode = sg.CreateShadingCustomNode();
            // Add the custom observer to our custom shading node.
            sgSepiaNode.AddObserver(customObserver);
            
            // Set the number of input slots to the custom node. In this case we only use the diffuse color from the loaded material as input.
            sgSepiaNode.SetInputCount(1);


            sgSepiaNode.SetInput(0, sgMaterialShadingNode);

            sgSepiaMaterial.SetShadingNetwork("Diffuse", sgSepiaNode);
        }
        
        // Start the reduction process.         
        Console.WriteLine("Start the reduction process.");
        sgReductionProcessor.RunProcessing();
        
        // Setup and run the diffuse material casting.         
        Console.WriteLine("Setup and run the diffuse material casting.");
        string diffuseTextureFilePath;
        using Simplygon.spColorCaster sgDiffuseCaster = sg.CreateColorCaster();
        sgDiffuseCaster.SetMappingImage( sgReductionProcessor.GetMappingImage() );
        sgDiffuseCaster.SetSourceMaterials( sgScene.GetMaterialTable() );
        sgDiffuseCaster.SetSourceTextures( sgScene.GetTextureTable() );
        sgDiffuseCaster.SetOutputFilePath( "DiffuseTexture" );

        using Simplygon.spColorCasterSettings sgDiffuseCasterSettings = sgDiffuseCaster.GetColorCasterSettings();
        sgDiffuseCasterSettings.SetMaterialChannel( "Diffuse" );
        sgDiffuseCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat.PNG );

        sgDiffuseCaster.RunProcessing();
        diffuseTextureFilePath = sgDiffuseCaster.GetOutputFilePath();
        
        // Update scene with new casted texture. 
        using Simplygon.spMaterialTable sgMaterialTable = sg.CreateMaterialTable();
        using Simplygon.spTextureTable sgTextureTable = sg.CreateTextureTable();
        using Simplygon.spMaterial sgMaterial = sg.CreateMaterial();
        using Simplygon.spTexture sgDiffuseTexture = sg.CreateTexture();
        sgDiffuseTexture.SetName( "Diffuse" );
        sgDiffuseTexture.SetFilePath( diffuseTextureFilePath );
        sgTextureTable.AddTexture( sgDiffuseTexture );

        using Simplygon.spShadingTextureNode sgDiffuseTextureShadingNode = sg.CreateShadingTextureNode();
        sgDiffuseTextureShadingNode.SetTexCoordLevel( 0 );
        sgDiffuseTextureShadingNode.SetTextureName( "Diffuse" );

        sgMaterial.AddMaterialChannel( "Diffuse" );
        sgMaterial.SetShadingNetwork( "Diffuse", sgDiffuseTextureShadingNode );

        sgMaterialTable.AddMaterial( sgMaterial );

        sgScene.GetTextureTable().Clear();
        sgScene.GetMaterialTable().Clear();
        sgScene.GetTextureTable().Copy(sgTextureTable);
        sgScene.GetMaterialTable().Copy(sgMaterialTable);
        
        // Save processed scene.         
        Console.WriteLine("Save processed scene.");
        SaveScene(sg, sgScene, "Output.fbx");
        
        // Check log for any warnings or errors.         
        Console.WriteLine("Check log for any warnings or errors.");
        CheckLog(sg);
    }
    static int Main(string[] args)
    {
        using var sg = Simplygon.Loader.InitSimplygon(out var errorCode, out var errorMessage);
        if (errorCode != Simplygon.EErrorCodes.NoError)
        {
            Console.WriteLine( $"Failed to initialize Simplygon: ErrorCode({(int)errorCode}) {errorMessage}" );
            return (int)errorCode;
        }
        customObserver = new CustomObserver();
        RunReductionWithShadingNetworks(sg);

        return 0;
    }
}

# Copyright (c) Microsoft Corporation. 
# Licensed under the MIT License. 

import math
import os
import sys
import glob
import gc
import threading

from pathlib import Path
from simplygon import simplygon_loader
from simplygon import Simplygon

class CustomObserver(Simplygon.Observer):
    def OnShadingCustomNodeEvaluate(self, subject: Simplygon.spObject):
        outputValue = Simplygon.ShadingColor( 0.0, 0.0, 0.0, 1.0 )
        if not subject.IsNull():
            customNode = Simplygon.spShadingCustomNode.SafeCast(subject)
            if not customNode.IsNull():
                inputValue = customNode.GetInputValue(0)
                outputValue.r = inputValue.r * 0.393 + inputValue.g * 0.769 + inputValue.b * 0.189
                outputValue.g = inputValue.r * 0.349 + inputValue.g * 0.686 + inputValue.b * 0.168
                outputValue.b = inputValue.r * 0.272 + inputValue.g * 0.534 + inputValue.b * 0.131
        return outputValue
    def OnShadingCustomNodeGenerateShaderCode(self, subject: Simplygon.spObject, shaderLanguage):
        if not subject.IsNull():
            customNode = Simplygon.spShadingCustomNode.SafeCast(subject)
            if not customNode.IsNull():
                customNode.SetCustomShaderCode( 'result = float4(dot(rgba_custom_input_0, float3(0.393f, 0.769f, 0.189f)), dot(rgba_custom_input_0, float3(0.349f, 0.686f, 0.168f)), dot(rgba_custom_input_0, float3(0.272f, 0.534f, 0.131f)), 1.0f);')
                return True
        return False

customObserver = CustomObserver()

def LoadScene(sg: Simplygon.ISimplygon, path: str):
    # Create scene importer 
    sgSceneImporter = sg.CreateSceneImporter()
    sgSceneImporter.SetImportFilePath(path)
    
    # Run scene importer. 
    importResult = sgSceneImporter.RunImport()
    if not importResult:
        raise Exception('Failed to load scene.')
    sgScene = sgSceneImporter.GetScene()
    return sgScene

def SaveScene(sg: Simplygon.ISimplygon, sgScene:Simplygon.spScene, path: str):
    # Create scene exporter. 
    sgSceneExporter = sg.CreateSceneExporter()
    sgSceneExporter.SetExportFilePath(path)
    sgSceneExporter.SetScene(sgScene)
    
    # Run scene exporter. 
    exportResult = sgSceneExporter.RunExport()
    if not exportResult:
        raise Exception('Failed to save scene.')

def CheckLog(sg: Simplygon.ISimplygon):
    # Check if any errors occurred. 
    hasErrors = sg.ErrorOccurred()
    if hasErrors:
        errors = sg.CreateStringArray()
        sg.GetErrorMessages(errors)
        errorCount = errors.GetItemCount()
        if errorCount > 0:
            print("Errors:")
            for errorIndex in range(errorCount):
                errorString = errors.GetItem(errorIndex)
                print(errorString)
            sg.ClearErrorMessages()
    else:
        print("No errors.")
    
    # Check if any warnings occurred. 
    hasWarnings = sg.WarningOccurred()
    if hasWarnings:
        warnings = sg.CreateStringArray()
        sg.GetWarningMessages(warnings)
        warningCount = warnings.GetItemCount()
        if warningCount > 0:
            print("Warnings:")
            for warningIndex in range(warningCount):
                warningString = warnings.GetItem(warningIndex)
                print(warningString)
            sg.ClearWarningMessages()
    else:
        print("No warnings.")

def RunReductionWithShadingNetworks(sg: Simplygon.ISimplygon):
    # Load scene to process.     
    print("Load scene to process.")
    sgScene = LoadScene(sg, "../../../Assets/SimplygonMan/SimplygonMan.obj")
    sgReductionProcessor = sg.CreateReductionProcessor()
    sgReductionProcessor.SetScene( sgScene )
    sgReductionSettings = sgReductionProcessor.GetReductionSettings()
    sgMappingImageSettings = sgReductionProcessor.GetMappingImageSettings()
    
    # Generates a mapping image which is used after the reduction to cast new materials to the new 
    # reduced object. 
    sgMappingImageSettings.SetGenerateMappingImage( True )
    sgMappingImageSettings.SetApplyNewMaterialIds( True )
    sgMappingImageSettings.SetGenerateTangents( True )
    sgMappingImageSettings.SetUseFullRetexturing( True )
    
    # Inject a sepia filter as a custom shading node into the shading network for the diffuse channel 
    # for each material in the scene. 
    materialCount = sgScene.GetMaterialTable().GetMaterialsCount()
    for i in range(0, materialCount):
        sgSepiaMaterial = sgScene.GetMaterialTable().GetMaterial(i)

        sgMaterialShadingNode = sgSepiaMaterial.GetShadingNetwork("Diffuse")
        sgSepiaNode = sg.CreateShadingCustomNode()

        # Add the custom observer to our custom shading node.
        sgSepiaNode.AddObserver(customObserver)
        
        # Set the number of input slots to the custom node. In this case we only use the diffuse color from the loaded material as input.
        sgSepiaNode.SetInputCount(1)


        sgSepiaNode.SetInput(0, sgMaterialShadingNode)

        sgSepiaMaterial.SetShadingNetwork('Diffuse', sgSepiaNode)
    
    # Start the reduction process.     
    print("Start the reduction process.")
    sgReductionProcessor.RunProcessing()
    
    # Setup and run the diffuse material casting.     
    print("Setup and run the diffuse material casting.")
    sgDiffuseCaster = sg.CreateColorCaster()
    sgDiffuseCaster.SetMappingImage( sgReductionProcessor.GetMappingImage() )
    sgDiffuseCaster.SetSourceMaterials( sgScene.GetMaterialTable() )
    sgDiffuseCaster.SetSourceTextures( sgScene.GetTextureTable() )
    sgDiffuseCaster.SetOutputFilePath( 'DiffuseTexture' )

    sgDiffuseCasterSettings = sgDiffuseCaster.GetColorCasterSettings()
    sgDiffuseCasterSettings.SetMaterialChannel( 'Diffuse' )
    sgDiffuseCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat_PNG )

    sgDiffuseCaster.RunProcessing()
    diffuseTextureFilePath = sgDiffuseCaster.GetOutputFilePath()
    
    # Update scene with new casted texture. 
    sgMaterialTable = sg.CreateMaterialTable()
    sgTextureTable = sg.CreateTextureTable()
    sgMaterial = sg.CreateMaterial()
    sgDiffuseTexture = sg.CreateTexture()
    sgDiffuseTexture.SetName( 'Diffuse' )
    sgDiffuseTexture.SetFilePath( diffuseTextureFilePath )
    sgTextureTable.AddTexture( sgDiffuseTexture )

    sgDiffuseTextureShadingNode = sg.CreateShadingTextureNode()
    sgDiffuseTextureShadingNode.SetTexCoordLevel( 0 )
    sgDiffuseTextureShadingNode.SetTextureName( 'Diffuse' )

    sgMaterial.AddMaterialChannel( 'Diffuse' )
    sgMaterial.SetShadingNetwork( 'Diffuse', sgDiffuseTextureShadingNode )

    sgMaterialTable.AddMaterial( sgMaterial )

    sgScene.GetTextureTable().Clear()
    sgScene.GetMaterialTable().Clear()
    sgScene.GetTextureTable().Copy(sgTextureTable)
    sgScene.GetMaterialTable().Copy(sgMaterialTable)
    
    # Save processed scene.     
    print("Save processed scene.")
    SaveScene(sg, sgScene, "Output.fbx")
    
    # Check log for any warnings or errors.     
    print("Check log for any warnings or errors.")
    CheckLog(sg)

if __name__ == '__main__':
    sg = simplygon_loader.init_simplygon()
    if sg is None:
        exit(Simplygon.GetLastInitializationError())

    RunReductionWithShadingNetworks(sg)

    sg = None
    gc.collect()