This example shows how to use the Reduction pipeline with a visibility occluder.

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

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


void RunReduction(Simplygon::ISimplygon* sg)
{
	Simplygon::spSceneImporter sgSceneImporter = sg->CreateSceneImporter();
	sgSceneImporter->SetImportFilePath( "../Assets/ObscuredTeapot/ObscuredTeapot.obj" );
	if(!sgSceneImporter->RunImport())
		throw std::exception("Failed to load ObscuredTeapot/ObscuredTeapot.obj.");
	Simplygon::spScene sgScene = sgSceneImporter->GetScene();

	// Create the reduction pipeline. 
	Simplygon::spReductionPipeline sgReductionPipeline = sg->CreateReductionPipeline();

	Simplygon::spReductionSettings sgReductionSettings = sgReductionPipeline->GetReductionSettings();
	Simplygon::spVisibilitySettings sgVisibilitySettings = sgReductionPipeline->GetVisibilitySettings();

	// Set reduction target to triangle ratio with a ratio of 50%. 
	sgReductionSettings->SetReductionTargets( Simplygon::EStopCondition::All, true, false, false, false );
	sgReductionSettings->SetReductionTargetTriangleRatio( 0.5f );

	// Add a selection set to the scene. We'll use this later as a occluder. 
	Simplygon::spSelectionSetTable sgSceneSelectionSetTable = sgScene->GetSelectionSetTable();
	Simplygon::spSelectionSet sgOccluderSelectionSet = sg->CreateSelectionSet();
	sgOccluderSelectionSet->SetName("Occluder");
	Simplygon::spSceneNode sgRootBox002 = sgScene->GetNodeFromPath("Root/Box002");
	if (!sgRootBox002.IsNull())
		sgOccluderSelectionSet->AddItem(sgRootBox002->GetNodeGUID());
	sgSceneSelectionSetTable->AddSelectionSet(sgOccluderSelectionSet);

	// Use the occluder previously added. 
	sgVisibilitySettings->SetOccluderSelectionSetName( "Occluder" );

	// Enabled GPU based visibility calculations. 
	sgVisibilitySettings->SetComputeVisibilityMode( Simplygon::EComputeVisibilityMode::DirectX );

	// Disabled conservative mode. 
	sgVisibilitySettings->SetConservativeMode( false );

	// Remove all non visible geometry. 
	sgVisibilitySettings->SetCullOccludedGeometry( true );

	// Skip filling nonvisible regions. 
	sgVisibilitySettings->SetFillNonVisibleAreaThreshold( 0.0f );

	// Don't remove non occluding triangles. 
	sgVisibilitySettings->SetRemoveTrianglesNotOccludingOtherTriangles( false );

	// Remove all back facing triangles. 
	sgVisibilitySettings->SetUseBackfaceCulling( true );

	// Don't use visibility weights. 
	sgVisibilitySettings->SetUseVisibilityWeightsInReducer( false );

	// Start the reduction pipeline. 
	sgReductionPipeline->RunScene(sgScene, Simplygon::EPipelineRunMode::RunInThisProcess);

	// Get the processed scene. 
	Simplygon::spScene sgProcessedScene = sgReductionPipeline->GetProcessedScene();

	Simplygon::spSceneExporter  sgSceneExporter = sg->CreateSceneExporter();
	sgSceneExporter->SetScene(sgProcessedScene);
	sgSceneExporter->SetExportFilePath( "ReductionOutput.fbx" );
	if(!sgSceneExporter->RunExport())
		throw std::exception("Failed to save ReductionOutput.fbx.");

}

void main()
{
	Simplygon::ISimplygon* sg = NULL;
	Simplygon::EErrorCodes initval = Simplygon::Initialize( &sg );
	if( initval != Simplygon::EErrorCodes::NoError )
	{
		return;
	}

	RunReduction(sg);

	Simplygon::Deinitialize(sg);
}

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

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

public class Program
{
    static void RunReduction(Simplygon.ISimplygon sg)
    {
        using (Simplygon.spSceneImporter sgSceneImporter = sg.CreateSceneImporter())
        {
            sgSceneImporter.SetImportFilePath( "../Assets/ObscuredTeapot/ObscuredTeapot.obj" );
            if(!sgSceneImporter.RunImport())
                throw new System.Exception("Failed to load ObscuredTeapot/ObscuredTeapot.obj.");
            Simplygon.spScene sgScene = sgSceneImporter.GetScene();

            // Create the reduction pipeline. 
            using (Simplygon.spReductionPipeline sgReductionPipeline = sg.CreateReductionPipeline())
            {
                using (Simplygon.spReductionSettings sgReductionSettings = sgReductionPipeline.GetReductionSettings())
                using (Simplygon.spVisibilitySettings sgVisibilitySettings = sgReductionPipeline.GetVisibilitySettings())
                {
                    // Set reduction target to triangle ratio with a ratio of 50%. 
                    sgReductionSettings.SetReductionTargets( Simplygon.EStopCondition.All, true, false, false, false );
                    sgReductionSettings.SetReductionTargetTriangleRatio( 0.5f );

                    // Add a selection set to the scene. We'll use this later as a occluder. 
                    using (Simplygon.spSelectionSetTable sgSceneSelectionSetTable = sgScene.GetSelectionSetTable())
                    using (Simplygon.spSelectionSet sgOccluderSelectionSet = sg.CreateSelectionSet())
                    {
                        sgOccluderSelectionSet.SetName("Occluder");
                        Simplygon.spSceneNode sgRootBox002 = sgScene.GetNodeFromPath("Root/Box002");
                        if (!sgRootBox002.IsNull())
                            sgOccluderSelectionSet.AddItem(sgRootBox002.GetNodeGUID());
                        sgSceneSelectionSetTable.AddSelectionSet(sgOccluderSelectionSet);
                    }

                    // Use the occluder previously added. 
                    sgVisibilitySettings.SetOccluderSelectionSetName( "Occluder" );

                    // Enabled GPU based visibility calculations. 
                    sgVisibilitySettings.SetComputeVisibilityMode( Simplygon.EComputeVisibilityMode.DirectX );

                    // Disabled conservative mode. 
                    sgVisibilitySettings.SetConservativeMode( false );

                    // Remove all non visible geometry. 
                    sgVisibilitySettings.SetCullOccludedGeometry( true );

                    // Skip filling nonvisible regions. 
                    sgVisibilitySettings.SetFillNonVisibleAreaThreshold( 0.0f );

                    // Don't remove non occluding triangles. 
                    sgVisibilitySettings.SetRemoveTrianglesNotOccludingOtherTriangles( false );

                    // Remove all back facing triangles. 
                    sgVisibilitySettings.SetUseBackfaceCulling( true );

                    // Don't use visibility weights. 
                    sgVisibilitySettings.SetUseVisibilityWeightsInReducer( false );

                }
                // Start the reduction pipeline. 
                sgReductionPipeline.RunScene(sgScene, Simplygon.EPipelineRunMode.RunInThisProcess);

                // Get the processed scene. 
                using (Simplygon.spScene sgProcessedScene = sgReductionPipeline.GetProcessedScene())
                {
                    using (Simplygon.spSceneExporter sgSceneExporter = sg.CreateSceneExporter())
                    {
                        sgSceneExporter.SetScene(sgProcessedScene);
                        sgSceneExporter.SetExportFilePath( "ReductionOutput.fbx" );
                        if(!sgSceneExporter.RunExport())
                            throw new System.Exception("Failed to save ReductionOutput.fbx.");

                    }
                }
            }
        }
    }
    static void Main(string[] args)
    {
        using (var sg = Simplygon.Loader.InitSimplygon(out var errorCode, out var errorMessage))
        {
            if (errorCode != Simplygon.EErrorCodes.NoError)
                return;
            RunReduction(sg);
        }
    }
}

# 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


def RunReduction(sg: Simplygon.ISimplygon):
    sgSceneImporter = sg.CreateSceneImporter()
    sgSceneImporter.SetImportFilePath( '../Assets/ObscuredTeapot/ObscuredTeapot.obj' )
    if not sgSceneImporter.RunImport():
        raise Exception('Failed to load ObscuredTeapot/ObscuredTeapot.obj.')
    sgScene = sgSceneImporter.GetScene()

    # Create the reduction pipeline. 
    sgReductionPipeline = sg.CreateReductionPipeline()

    sgReductionSettings = sgReductionPipeline.GetReductionSettings()
    sgVisibilitySettings = sgReductionPipeline.GetVisibilitySettings()

    # Set reduction target to triangle ratio with a ratio of 50%. 
    sgReductionSettings.SetReductionTargets( Simplygon.EStopCondition_All, True, False, False, False )
    sgReductionSettings.SetReductionTargetTriangleRatio( 0.5 )

    # Add a selection set to the scene. We'll use this later as a occluder. 
    sgSceneSelectionSetTable = sgScene.GetSelectionSetTable()
    sgOccluderSelectionSet = sg.CreateSelectionSet()
    sgOccluderSelectionSet.SetName("Occluder")
    sgRootBox002 = sgScene.GetNodeFromPath('Root/Box002')
    if sgRootBox002 is not None:
        sgOccluderSelectionSet.AddItem(sgRootBox002.GetNodeGUID())
    sgSceneSelectionSetTable.AddSelectionSet(sgOccluderSelectionSet)

    # Use the occluder previously added. 
    sgVisibilitySettings.SetOccluderSelectionSetName( "Occluder" )

    # Enabled GPU based visibility calculations. 
    sgVisibilitySettings.SetComputeVisibilityMode( Simplygon.EComputeVisibilityMode_DirectX )

    # Disabled conservative mode. 
    sgVisibilitySettings.SetConservativeMode( False )

    # Remove all non visible geometry. 
    sgVisibilitySettings.SetCullOccludedGeometry( True )

    # Skip filling nonvisible regions. 
    sgVisibilitySettings.SetFillNonVisibleAreaThreshold( 0.0 )

    # Don't remove non occluding triangles. 
    sgVisibilitySettings.SetRemoveTrianglesNotOccludingOtherTriangles( False )

    # Remove all back facing triangles. 
    sgVisibilitySettings.SetUseBackfaceCulling( True )

    # Don't use visibility weights. 
    sgVisibilitySettings.SetUseVisibilityWeightsInReducer( False )

    # Start the reduction pipeline. 
    sgReductionPipeline.RunScene(sgScene, Simplygon.EPipelineRunMode_RunInThisProcess)

    # Get the processed scene. 
    sgProcessedScene = sgReductionPipeline.GetProcessedScene()

    sgSceneExporter = sg.CreateSceneExporter()
    sgSceneExporter.SetScene(sgProcessedScene)
    sgSceneExporter.SetExportFilePath( 'ReductionOutput.fbx' )
    if not sgSceneExporter.RunExport():
        raise Exception('Failed to save ReductionOutput.fbx.')


if __name__ == '__main__':
    sg = simplygon_loader.init_simplygon()
    if sg is not None:

        RunReduction(sg)

    sg = None
    gc.collect()