This example shows how to use the Billboard cloud pipeline

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

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


Simplygon::spScene LoadScene(Simplygon::ISimplygon* sg, const char* path)
{
	// Create scene importer 
	Simplygon::spSceneImporter sgSceneImporter = sg->CreateSceneImporter();
	sgSceneImporter->SetImportFilePath(path);
	
	// Run scene importer. 
	auto importResult = sgSceneImporter->Run();
	if (Simplygon::Failed(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();
	std::string outputScenePath = std::string("output\\") + std::string("ImpostorPipelineBillboardCloudOuterShell") + std::string("_") + std::string(path);
	sgSceneExporter->SetExportFilePath(outputScenePath.c_str());
	sgSceneExporter->SetScene(sgScene);
	
	// Run scene exporter. 
	auto exportResult = sgSceneExporter->Run();
	if (Simplygon::Failed(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 RunBillboardCloudPipeline(Simplygon::ISimplygon* sg)
{
	// Load scene to process. 	
	printf("%s\n", "Load scene to process.");
	Simplygon::spScene sgScene = LoadScene(sg, "../../../Assets/Cages/Cages.obj");
	
	// For all materials in the scene set the blend mode to blend (instead of opaque) 
	for (int i = 0; i < (int)sgScene->GetMaterialTable()->GetMaterialsCount(); ++i)
	{
		sgScene->GetMaterialTable()->GetMaterial(i)->SetBlendMode(Simplygon::EMaterialBlendMode::Blend);
	}
	
	// Create the Impostor processor. 
	Simplygon::spBillboardCloudPipeline sgBillboardCloudPipeline = sg->CreateBillboardCloudPipeline();
	Simplygon::spBillboardCloudSettings sgBillboardCloudSettings = sgBillboardCloudPipeline->GetBillboardCloudSettings();
	Simplygon::spMappingImageSettings sgMappingImageSettings = sgBillboardCloudPipeline->GetMappingImageSettings();
	
	// Set billboard cloud mode to Outer shell. 
	sgBillboardCloudSettings->SetBillboardMode( Simplygon::EBillboardMode::OuterShell );
	sgBillboardCloudSettings->SetBillboardDensity( 0.5f );
	sgBillboardCloudSettings->SetGeometricComplexity( 0.9f );
	sgBillboardCloudSettings->SetMaxPlaneCount( 20 );
	sgBillboardCloudSettings->SetTwoSided( false );
	sgMappingImageSettings->SetMaximumLayers( 10 );
	Simplygon::spMappingImageOutputMaterialSettings sgOutputMaterialSettings = sgMappingImageSettings->GetOutputMaterialSettings(0);
	
	// Setting the size of the output material for the mapping image. This will be the output size of the 
	// textures when we do material casting in a later stage. 
	sgOutputMaterialSettings->SetTextureWidth( 1024 );
	sgOutputMaterialSettings->SetTextureHeight( 1024 );
	sgOutputMaterialSettings->SetMultisamplingLevel( 2 );
	
	// Add diffuse material caster to pipeline. 
	Simplygon::spColorCaster sgDiffuseCaster = sg->CreateColorCaster();

	Simplygon::spColorCasterSettings sgDiffuseCasterSettings = sgDiffuseCaster->GetColorCasterSettings();
	sgDiffuseCasterSettings->SetMaterialChannel( "Diffuse" );
	sgDiffuseCasterSettings->SetOutputImageFileFormat( Simplygon::EImageOutputFormat::PNG );
	sgDiffuseCasterSettings->SetBakeOpacityInAlpha( false );
	sgDiffuseCasterSettings->SetOutputPixelFormat( Simplygon::EPixelFormat::R8G8B8 );
	sgDiffuseCasterSettings->SetDilation( 10 );
	sgDiffuseCasterSettings->SetFillMode( Simplygon::EAtlasFillMode::Interpolate );

	sgBillboardCloudPipeline->AddMaterialCaster( sgDiffuseCaster, 0 );
	
	// Add specular material caster to pipeline. 
	Simplygon::spColorCaster sgSpecularCaster = sg->CreateColorCaster();

	Simplygon::spColorCasterSettings sgSpecularCasterSettings = sgSpecularCaster->GetColorCasterSettings();
	sgSpecularCasterSettings->SetMaterialChannel( "Specular" );
	sgSpecularCasterSettings->SetOutputImageFileFormat( Simplygon::EImageOutputFormat::PNG );
	sgSpecularCasterSettings->SetDilation( 10 );
	sgSpecularCasterSettings->SetFillMode( Simplygon::EAtlasFillMode::Interpolate );

	sgBillboardCloudPipeline->AddMaterialCaster( sgSpecularCaster, 0 );
	
	// Add normals material caster to pipeline. 
	Simplygon::spNormalCaster sgNormalsCaster = sg->CreateNormalCaster();

	Simplygon::spNormalCasterSettings sgNormalsCasterSettings = sgNormalsCaster->GetNormalCasterSettings();
	sgNormalsCasterSettings->SetMaterialChannel( "Normals" );
	sgNormalsCasterSettings->SetGenerateTangentSpaceNormals( true );
	sgNormalsCasterSettings->SetOutputImageFileFormat( Simplygon::EImageOutputFormat::PNG );
	sgNormalsCasterSettings->SetDilation( 10 );
	sgNormalsCasterSettings->SetFillMode( Simplygon::EAtlasFillMode::Interpolate );

	sgBillboardCloudPipeline->AddMaterialCaster( sgNormalsCaster, 0 );
	
	// Setup and run the opacity material casting. Make sure the there is no dilation or fill. 
	Simplygon::spOpacityCaster sgOpacityCaster = sg->CreateOpacityCaster();

	Simplygon::spOpacityCasterSettings sgOpacityCasterSettings = sgOpacityCaster->GetOpacityCasterSettings();
	sgOpacityCasterSettings->SetMaterialChannel( "Opacity" );
	sgOpacityCasterSettings->SetOutputImageFileFormat( Simplygon::EImageOutputFormat::PNG );
	sgOpacityCasterSettings->SetFillMode( Simplygon::EAtlasFillMode::NoFill );
	sgOpacityCasterSettings->SetOutputPixelFormat( Simplygon::EPixelFormat::R8 );

	sgBillboardCloudPipeline->AddMaterialCaster( sgOpacityCaster, 0 );
	
	// Start the impostor pipeline. 	
	printf("%s\n", "Start the impostor pipeline.");
	sgBillboardCloudPipeline->RunScene(sgScene, Simplygon::EPipelineRunMode::RunInThisProcess);
	
	// Get the processed scene. 
	Simplygon::spScene sgProcessedScene = sgBillboardCloudPipeline->GetProcessedScene();
	
	// Save processed scene. 	
	printf("%s\n", "Save processed scene.");
	SaveScene(sg, sgProcessedScene, "Output.glb");
	
	// 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);
	}

	RunBillboardCloudPipeline(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 Program
{
    static Simplygon.spScene LoadScene(Simplygon.ISimplygon sg, string path)
    {
        // Create scene importer 
        using Simplygon.spSceneImporter sgSceneImporter = sg.CreateSceneImporter();
        sgSceneImporter.SetImportFilePath(path);
        
        // Run scene importer. 
        var importResult = sgSceneImporter.Run();
        if (Simplygon.Simplygon.Failed(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();
        string outputScenePath = string.Join("", new string[] { "output\\", "ImpostorPipelineBillboardCloudOuterShell", "_", path });
        sgSceneExporter.SetExportFilePath(outputScenePath);
        sgSceneExporter.SetScene(sgScene);
        
        // Run scene exporter. 
        var exportResult = sgSceneExporter.Run();
        if (Simplygon.Simplygon.Failed(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 RunBillboardCloudPipeline(Simplygon.ISimplygon sg)
    {
        // Load scene to process.         
        Console.WriteLine("Load scene to process.");
        Simplygon.spScene sgScene = LoadScene(sg, "../../../Assets/Cages/Cages.obj");
        
        // For all materials in the scene set the blend mode to blend (instead of opaque) 
        for (int i = 0; i < (int)sgScene.GetMaterialTable().GetMaterialsCount(); ++i)
        {
            sgScene.GetMaterialTable().GetMaterial(i).SetBlendMode(Simplygon.EMaterialBlendMode.Blend);
        }
        
        // Create the Impostor processor. 
        using Simplygon.spBillboardCloudPipeline sgBillboardCloudPipeline = sg.CreateBillboardCloudPipeline();
        using Simplygon.spBillboardCloudSettings sgBillboardCloudSettings = sgBillboardCloudPipeline.GetBillboardCloudSettings();
        using Simplygon.spMappingImageSettings sgMappingImageSettings = sgBillboardCloudPipeline.GetMappingImageSettings();
        
        // Set billboard cloud mode to Outer shell. 
        sgBillboardCloudSettings.SetBillboardMode( Simplygon.EBillboardMode.OuterShell );
        sgBillboardCloudSettings.SetBillboardDensity( 0.5f );
        sgBillboardCloudSettings.SetGeometricComplexity( 0.9f );
        sgBillboardCloudSettings.SetMaxPlaneCount( 20 );
        sgBillboardCloudSettings.SetTwoSided( false );
        sgMappingImageSettings.SetMaximumLayers( 10 );
        using Simplygon.spMappingImageOutputMaterialSettings sgOutputMaterialSettings = sgMappingImageSettings.GetOutputMaterialSettings(0);
        
        // Setting the size of the output material for the mapping image. This will be the output size of the 
        // textures when we do material casting in a later stage. 
        sgOutputMaterialSettings.SetTextureWidth( 1024 );
        sgOutputMaterialSettings.SetTextureHeight( 1024 );
        sgOutputMaterialSettings.SetMultisamplingLevel( 2 );
        
        // Add diffuse material caster to pipeline. 
        using Simplygon.spColorCaster sgDiffuseCaster = sg.CreateColorCaster();

        using Simplygon.spColorCasterSettings sgDiffuseCasterSettings = sgDiffuseCaster.GetColorCasterSettings();
        sgDiffuseCasterSettings.SetMaterialChannel( "Diffuse" );
        sgDiffuseCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat.PNG );
        sgDiffuseCasterSettings.SetBakeOpacityInAlpha( false );
        sgDiffuseCasterSettings.SetOutputPixelFormat( Simplygon.EPixelFormat.R8G8B8 );
        sgDiffuseCasterSettings.SetDilation( 10 );
        sgDiffuseCasterSettings.SetFillMode( Simplygon.EAtlasFillMode.Interpolate );

        sgBillboardCloudPipeline.AddMaterialCaster( sgDiffuseCaster, 0 );
        
        // Add specular material caster to pipeline. 
        using Simplygon.spColorCaster sgSpecularCaster = sg.CreateColorCaster();

        using Simplygon.spColorCasterSettings sgSpecularCasterSettings = sgSpecularCaster.GetColorCasterSettings();
        sgSpecularCasterSettings.SetMaterialChannel( "Specular" );
        sgSpecularCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat.PNG );
        sgSpecularCasterSettings.SetDilation( 10 );
        sgSpecularCasterSettings.SetFillMode( Simplygon.EAtlasFillMode.Interpolate );

        sgBillboardCloudPipeline.AddMaterialCaster( sgSpecularCaster, 0 );
        
        // Add normals material caster to pipeline. 
        using Simplygon.spNormalCaster sgNormalsCaster = sg.CreateNormalCaster();

        using Simplygon.spNormalCasterSettings sgNormalsCasterSettings = sgNormalsCaster.GetNormalCasterSettings();
        sgNormalsCasterSettings.SetMaterialChannel( "Normals" );
        sgNormalsCasterSettings.SetGenerateTangentSpaceNormals( true );
        sgNormalsCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat.PNG );
        sgNormalsCasterSettings.SetDilation( 10 );
        sgNormalsCasterSettings.SetFillMode( Simplygon.EAtlasFillMode.Interpolate );

        sgBillboardCloudPipeline.AddMaterialCaster( sgNormalsCaster, 0 );
        
        // Setup and run the opacity material casting. Make sure the there is no dilation or fill. 
        using Simplygon.spOpacityCaster sgOpacityCaster = sg.CreateOpacityCaster();

        using Simplygon.spOpacityCasterSettings sgOpacityCasterSettings = sgOpacityCaster.GetOpacityCasterSettings();
        sgOpacityCasterSettings.SetMaterialChannel( "Opacity" );
        sgOpacityCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat.PNG );
        sgOpacityCasterSettings.SetFillMode( Simplygon.EAtlasFillMode.NoFill );
        sgOpacityCasterSettings.SetOutputPixelFormat( Simplygon.EPixelFormat.R8 );

        sgBillboardCloudPipeline.AddMaterialCaster( sgOpacityCaster, 0 );
        
        // Start the impostor pipeline.         
        Console.WriteLine("Start the impostor pipeline.");
        sgBillboardCloudPipeline.RunScene(sgScene, Simplygon.EPipelineRunMode.RunInThisProcess);
        
        // Get the processed scene. 
        using Simplygon.spScene sgProcessedScene = sgBillboardCloudPipeline.GetProcessedScene();
        
        // Save processed scene.         
        Console.WriteLine("Save processed scene.");
        SaveScene(sg, sgProcessedScene, "Output.glb");
        
        // 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;
        }
        RunBillboardCloudPipeline(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 simplygon10 import simplygon_loader
from simplygon10 import Simplygon


def LoadScene(sg: Simplygon.ISimplygon, path: str):
    # Create scene importer 
    sgSceneImporter = sg.CreateSceneImporter()
    sgSceneImporter.SetImportFilePath(path)
    
    # Run scene importer. 
    importResult = sgSceneImporter.Run()
    if Simplygon.Failed(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()
    outputScenePath = ''.join(['output\\', 'ImpostorPipelineBillboardCloudOuterShell', '_', path])
    sgSceneExporter.SetExportFilePath(outputScenePath)
    sgSceneExporter.SetScene(sgScene)
    
    # Run scene exporter. 
    exportResult = sgSceneExporter.Run()
    if Simplygon.Failed(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 RunBillboardCloudPipeline(sg: Simplygon.ISimplygon):
    # Load scene to process.     
    print("Load scene to process.")
    sgScene = LoadScene(sg, '../../../Assets/Cages/Cages.obj')
    
    # For all materials in the scene set the blend mode to blend (instead of opaque) 
    materialCount = sgScene.GetMaterialTable().GetMaterialsCount()
    for i in range(0, materialCount):
        sgScene.GetMaterialTable().GetMaterial(i).SetBlendMode(Simplygon.EMaterialBlendMode_Blend)
    
    # Create the Impostor processor. 
    sgBillboardCloudPipeline = sg.CreateBillboardCloudPipeline()
    sgBillboardCloudSettings = sgBillboardCloudPipeline.GetBillboardCloudSettings()
    sgMappingImageSettings = sgBillboardCloudPipeline.GetMappingImageSettings()
    
    # Set billboard cloud mode to Outer shell. 
    sgBillboardCloudSettings.SetBillboardMode( Simplygon.EBillboardMode_OuterShell )
    sgBillboardCloudSettings.SetBillboardDensity( 0.5 )
    sgBillboardCloudSettings.SetGeometricComplexity( 0.9 )
    sgBillboardCloudSettings.SetMaxPlaneCount( 20 )
    sgBillboardCloudSettings.SetTwoSided( False )
    sgMappingImageSettings.SetMaximumLayers( 10 )
    sgOutputMaterialSettings = sgMappingImageSettings.GetOutputMaterialSettings(0)
    
    # Setting the size of the output material for the mapping image. This will be the output size of the 
    # textures when we do material casting in a later stage. 
    sgOutputMaterialSettings.SetTextureWidth( 1024 )
    sgOutputMaterialSettings.SetTextureHeight( 1024 )
    sgOutputMaterialSettings.SetMultisamplingLevel( 2 )
    
    # Add diffuse material caster to pipeline. 
    sgDiffuseCaster = sg.CreateColorCaster()
    sgDiffuseCasterSettings = sgDiffuseCaster.GetColorCasterSettings()
    sgDiffuseCasterSettings.SetMaterialChannel( "Diffuse" )
    sgDiffuseCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat_PNG )
    sgDiffuseCasterSettings.SetBakeOpacityInAlpha( False )
    sgDiffuseCasterSettings.SetOutputPixelFormat( Simplygon.EPixelFormat_R8G8B8 )
    sgDiffuseCasterSettings.SetDilation( 10 )
    sgDiffuseCasterSettings.SetFillMode( Simplygon.EAtlasFillMode_Interpolate )

    sgBillboardCloudPipeline.AddMaterialCaster( sgDiffuseCaster, 0 )
    
    # Add specular material caster to pipeline. 
    sgSpecularCaster = sg.CreateColorCaster()
    sgSpecularCasterSettings = sgSpecularCaster.GetColorCasterSettings()
    sgSpecularCasterSettings.SetMaterialChannel( "Specular" )
    sgSpecularCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat_PNG )
    sgSpecularCasterSettings.SetDilation( 10 )
    sgSpecularCasterSettings.SetFillMode( Simplygon.EAtlasFillMode_Interpolate )

    sgBillboardCloudPipeline.AddMaterialCaster( sgSpecularCaster, 0 )
    
    # Add normals material caster to pipeline. 
    sgNormalsCaster = sg.CreateNormalCaster()
    sgNormalsCasterSettings = sgNormalsCaster.GetNormalCasterSettings()
    sgNormalsCasterSettings.SetMaterialChannel( "Normals" )
    sgNormalsCasterSettings.SetGenerateTangentSpaceNormals( True )
    sgNormalsCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat_PNG )
    sgNormalsCasterSettings.SetDilation( 10 )
    sgNormalsCasterSettings.SetFillMode( Simplygon.EAtlasFillMode_Interpolate )

    sgBillboardCloudPipeline.AddMaterialCaster( sgNormalsCaster, 0 )
    
    # Setup and run the opacity material casting. Make sure the there is no dilation or fill. 
    sgOpacityCaster = sg.CreateOpacityCaster()
    sgOpacityCasterSettings = sgOpacityCaster.GetOpacityCasterSettings()
    sgOpacityCasterSettings.SetMaterialChannel( "Opacity" )
    sgOpacityCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat_PNG )
    sgOpacityCasterSettings.SetFillMode( Simplygon.EAtlasFillMode_NoFill )
    sgOpacityCasterSettings.SetOutputPixelFormat( Simplygon.EPixelFormat_R8 )

    sgBillboardCloudPipeline.AddMaterialCaster( sgOpacityCaster, 0 )
    
    # Start the impostor pipeline.     
    print("Start the impostor pipeline.")
    sgBillboardCloudPipeline.RunScene(sgScene, Simplygon.EPipelineRunMode_RunInThisProcess)
    
    # Get the processed scene. 
    sgProcessedScene = sgBillboardCloudPipeline.GetProcessedScene()
    
    # Save processed scene.     
    print("Save processed scene.")
    SaveScene(sg, sgProcessedScene, 'Output.glb')
    
    # 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())

        RunBillboardCloudPipeline(sg)

        sg = None
        gc.collect()