static void RunHighQualityReduction(ISimplygonSDK sdk, string readFrom, string writeTo)
{
spWavefrontImporter objReader = sdk.CreateWavefrontImporter();
objReader.SetExtractGroups(false); //This makes the .obj reader import into a single geometry object instead of multiple
objReader.SetImportFilePath(readFrom);
if (!objReader.RunImport())
{
Console.WriteLine("Failed to read: " + readFrom);
return;
}
spGeometryData originalGeom = objReader.GetFirstGeometry(); //Only contains a single geom, so "first" is fine
spMaterialTable originalMaterials = objReader.GetMaterials();
//Create a copy of the original geometry on which we will run the reduction
spGeometryData lodGeom = originalGeom.NewCopy(true);
// Create the reduction-processor, and set the geometry to reduce
spReductionProcessor reductionProcessor = sdk.CreateReductionProcessor();
reductionProcessor.SetGeometry(lodGeom);
///////////////////////////////////////////////////////////////////////////////////////////////
// SETTINGS - Most of these are set to the same value by default, but are set anyway for clarity
// The reduction settings object contains settings pertaining to the actual decimation
spReductionSettings reductionSettings = reductionProcessor.GetReductionSettings();
reductionSettings.SetEnablePreprocessing(true); //This enables the pre-processing block, which contains welding and t-junction removal
reductionSettings.SetEnablePostprocessing(true); //This enables the post-processing block, which contains normal recalculation and mapping image generation
reductionSettings.SetKeepSymmetry(true); //Try, when possible to reduce symmetrically
reductionSettings.SetUseAutomaticSymmetryDetection(true); //Auto-detect the symmetry plane, if one exists. Can, if required, be set manually instead.
reductionSettings.SetUseHighQualityNormalCalculation(true); //Drastically increases the quality of the LODs normals, at the cost of extra processing time.
reductionSettings.SetReductionHeuristics((uint)ReductionHeuristics.SG_REDUCTIONHEURISTICS_CONSISTENT); //Choose between "fast" and "consistent" processing. Fast will look as good, but may cause inconsistent
//triangle counts when comparing MaxDeviation targets to the corresponding percentage targets.
// The reducer uses a feature flags mask to tell it what kind of borders to respect during reduction.
FeatureFlags featureFlagsMask = 0;
featureFlagsMask |= FeatureFlags.SG_FEATUREFLAGS_GROUP; //Respect borders between group ids
featureFlagsMask |= FeatureFlags.SG_FEATUREFLAGS_MATERIAL; //Respect borders between material ids
featureFlagsMask |= FeatureFlags.SG_FEATUREFLAGS_TEXTURE0; //Respect discontinuities in the first texcoord field
featureFlagsMask |= FeatureFlags.SG_FEATUREFLAGS_SHADING; //Respect hard shading borders
reductionSettings.SetFeatureFlags((uint)featureFlagsMask);
// The reducer uses importance weights for all features to decide where and how to reduce.
// These are advanced settings and should only be changed if you have some specific reduction requirement
/*reductionSettings.SetShadingImportance(2.f); //This would make the shading twice as important to the reducer as the other features.*/
// The actual reduction triangle target are controlled by these three settings
reductionSettings.SetStopCondition((uint)StopCondition.SG_STOPCONDITION_EITHER_IS_REACHED); //The reduction stops when either of the targets is reached
reductionSettings.SetReductionRatio(0.5f); //Stops at 50% of the original triangle count
reductionSettings.SetMaxDeviation(SimplygonSDK.REAL_MAX); //Stops when an error of the specified size has been reached. As set here it never happens.
//This condition corresponds to the on-screen size target presented in the Simplygon GUI, with a simple formula to convert between the two.
// The repair settings object contains settings for the pre-processing block
spRepairSettings repairSettings = reductionProcessor.GetRepairSettings();
repairSettings.SetTjuncDist(0.0f); //Removes t-junctions with distance 0.0f
repairSettings.SetWeldDist(0.0f); //Welds overlapping vertices
// The normal calculation settings deal with the normal-specific reduction settings
spNormalCalculationSettings normalSettings = reductionProcessor.GetNormalCalculationSettings();
normalSettings.SetReplaceNormals(false); //If true, this will turn off normal handling in the reducer and recalculate them all afterwards instead.
//If false, the reducer will try to preserve the original normals as well as possible
/*normalSettings.SetHardEdgeAngle( 60.f ); //If the normals are recalculated, this sets the hard-edge angle.*/
//END SETTINGS
///////////////////////////////////////////////////////////////////////////////////////////////
// Run the actual processing. After this, the set geometry will have been reduced according to the settings
reductionProcessor.RunProcessing();
//Create an .obj exporter to save our result
spWavefrontExporter objExporter = sdk.CreateWavefrontExporter();
// Do the actual exporting
objExporter.SetExportFilePath(writeTo + ".obj");
objExporter.SetSingleGeometry(lodGeom); //This is the geometry we set as the processing geom of the reducer
objExporter.SetMaterials(originalMaterials); //Same material set as input
if (!objExporter.RunExport())
{
Console.WriteLine("Failed to write target file");
}
//Done! LOD created.
}
static void RunReductionWithTextureCasting(ISimplygonSDK sdk, string readFrom, string writeTo)
{
// Load input geometry from file
spWavefrontImporter objReader = sdk.CreateWavefrontImporter();
objReader.SetExtractGroups(false); //This makes the .obj reader import into a single geometry object instead of multiple
objReader.SetImportFilePath(readFrom);
if (!objReader.RunImport())
{
Console.WriteLine("Failed to read: " + readFrom);
return;
}
// Get geometry and materials from importer
spGeometryData originalGeom = objReader.GetFirstGeometry(); //Only contains a single geom, so "first" is fine
spMaterialTable originalMaterialTable = objReader.GetMaterials();
// Create a copy of the original geometry on which we will run the reduction
spGeometryData lodGeometry = originalGeom.NewCopy(true);
// Create the reduction-processor, and set the geometry to reduce
spReductionProcessor reductionProcessor = sdk.CreateReductionProcessor();
reductionProcessor.SetGeometry(lodGeometry);
///////////////////////////////////////////////////////////////////////////////////////////////
// SETTINGS - Most of these are set to the same value by default, but are set anyway for clarity
// The reduction settings object contains settings pertaining to the actual decimation
spReductionSettings reductionSettings = reductionProcessor.GetReductionSettings();
reductionSettings.SetReductionHeuristics((uint)ReductionHeuristics.SG_REDUCTIONHEURISTICS_FAST); //Choose between "fast" and "consistent" processing.
// The actual reduction triangle target are controlled by these three settings
reductionSettings.SetStopCondition((uint)StopCondition.SG_STOPCONDITION_EITHER_IS_REACHED); //The reduction stops when either of the targets is reached
reductionSettings.SetReductionRatio(0.5f); //Stops at 50% of the original triangle count
reductionSettings.SetMaxDeviation(SimplygonSDK.REAL_MAX); //Stops when an error of the specified size has been reached. As set here it never happens.
// The normal calculation settings deal with the normal-specific reduction settings
spNormalCalculationSettings normalSettings = reductionProcessor.GetNormalCalculationSettings();
normalSettings.SetReplaceNormals(true); //If true, this will turn off normal handling in the reducer and recalculate them all afterwards instead.
normalSettings.SetHardEdgeAngle(70.0f); //If the normals are recalculated, this sets the hard-edge angle.
// The Image Mapping Settings, specifically needed for the texture baking we are doing later
spMappingImageSettings mappingSettings = reductionProcessor.GetMappingImageSettings();
mappingSettings.SetGenerateMappingImage(true); //Without this we cannot fetch data from the original geometry, and thus not generate diffuse and normal-maps later on.
mappingSettings.SetGenerateTexCoords(true); //Set to generate new texture coordinates.
mappingSettings.SetMaxStretch(0.4f); //The higher the number, the fewer texture-borders.
mappingSettings.SetGutterSpace(2); //Buffer space for when texture is mip-mapped, so color values don't blend over. Greatly influences packing efficiency
mappingSettings.SetTexCoordLevel(0); //Sets the output texcoord level. For this asset, this will overwrite the original coords
mappingSettings.SetWidth(1024);
mappingSettings.SetHeight(1024);
mappingSettings.SetMultisamplingLevel(2);
//END SETTINGS
///////////////////////////////////////////////////////////////////////////////////////////////
// Run the actual processing. After this, the set geometry will have been reduced according to the settings
reductionProcessor.RunProcessing();
///////////////////////////////////////////////////////////////////////////////////////////////
// CASTING
// Now, we need to retrieve the generated mapping image and use it to cast the old materials into a new one, for each channel.
spMappingImage mappingImage = reductionProcessor.GetMappingImage();
// Now, for each channel, we want to cast the 9 input materials into a single output material, with one texture per channel.
// First, create a new material table.
spMaterialTable lodMaterialTable = sdk.CreateMaterialTable();
// Create new material for the table.
spMaterial lodMaterial = sdk.CreateMaterial();
lodMaterial.SetName("SimplygonBakedMaterial");
lodMaterialTable.AddMaterial(lodMaterial);
// Cast diffuse and specular texture data with a color caster
{
// Set the material properties
lodMaterial.SetColor(SimplygonSDK.SG_MATERIAL_CHANNEL_AMBIENT, 0, 0, 0, 0);
lodMaterial.SetColor(SimplygonSDK.SG_MATERIAL_CHANNEL_DIFFUSE, 1, 1, 1, 1);
lodMaterial.SetColor(SimplygonSDK.SG_MATERIAL_CHANNEL_SPECULAR, 1, 1, 1, 128);
//Note the 128 on the specular channels alpha. Simplygon bakes shininess
//to the alpha channel of the specular map if the caster is set to 4 channel
//output, and it is scaled between 0 and 1 internally. To get the correct
//scale on the output, it should be multiplied by 128.
// Cast the data using a color caster
spColorCaster colorCaster = sdk.CreateColorCaster();
colorCaster.SetSourceMaterials(originalMaterialTable);
colorCaster.SetDestMaterial(lodMaterial); //This modulates the cast color with the base colors set for the dest material above.
//It means the internal shininess is multiplied by 128 before baking to texture.
colorCaster.SetMappingImage(mappingImage); //The mapping image we got from the reduction process.
colorCaster.SetOutputChannelBitDepth(8); //8 bits per channel. So in this case we will have 24bit colors RGB.
colorCaster.SetDilation(10); //To avoid mip-map artifacts, the empty pixels on the map needs to be filled to a degree as well.
colorCaster.SetColorType(SimplygonSDK.SG_MATERIAL_CHANNEL_DIFFUSE);
colorCaster.SetOutputChannels(3); //RGB, 3 channels! (1 would be for grey scale, and 4 would be for RGBA.)
colorCaster.SetOutputFilePath("combinedDiffuseMap.png"); //Where the texture map will be saved to file.
colorCaster.CastMaterials(); //Do the actual casting and write to texture.
colorCaster.SetColorType(SimplygonSDK.SG_MATERIAL_CHANNEL_SPECULAR);
colorCaster.SetOutputChannels(4); //RGBA, 4 channels! Stores spec power in A
colorCaster.SetOutputFilePath("combinedSpecularMap.png"); //Where the texture map will be saved to file.
colorCaster.CastMaterials(); //Do the actual casting and write to texture.
lodMaterial.SetTexture(SimplygonSDK.SG_MATERIAL_CHANNEL_DIFFUSE, "combinedDiffuseMap.png"); //Set material to point to the texture we cast to above
lodMaterial.SetTexture(SimplygonSDK.SG_MATERIAL_CHANNEL_SPECULAR, "combinedSpecularMap.png"); //Set material to point to the texture we cast to above
}
// Cast normal map texture data with the normal caster. This also compensates for any geometric errors that have appeared in the reduction process.
{
// cast the data using a normal caster
spNormalCaster normalCaster = sdk.CreateNormalCaster();
normalCaster.SetSourceMaterials(originalMaterialTable);
normalCaster.SetMappingImage(mappingImage);
normalCaster.SetOutputChannels(3); // RGB, 3 channels! (But really the x, y and z values for the normal)
normalCaster.SetOutputChannelBitDepth(8);
normalCaster.SetDilation(10);
normalCaster.SetOutputFilePath("combinedNormalMap.png");
normalCaster.SetFlipBackfacingNormals(false);
normalCaster.SetGenerateTangentSpaceNormals(true);
normalCaster.CastMaterials();
// Set normal map of the created material to point to the combined normal map
lodMaterial.SetTexture(SimplygonSDK.SG_MATERIAL_CHANNEL_NORMALS, "combinedNormalMap.png");
}
// END CASTING
///////////////////////////////////////////////////////////////////////////////////////////////
//Create an .obj exporter to save our result
spWavefrontExporter objExporter = sdk.CreateWavefrontExporter();
// Generate the output filenames
// Do the actual exporting
objExporter.SetExportFilePath(writeTo + ".obj");
objExporter.SetSingleGeometry(lodGeometry); //This is the geometry we set as the processing geom of the reducer
objExporter.SetMaterials(lodMaterialTable); //Our new cast material
if (!objExporter.RunExport())
{
Console.WriteLine("Failed to write target file");
}
//Done! LOD and material created.
}
static void RunCascadedLodChainReduction(ISimplygonSDK sdk, string readFrom, string writeToLod1, string writeToLod2, string writeToLod3)
{
// Load input geometry from file
spWavefrontImporter objReader = sdk.CreateWavefrontImporter();
objReader.SetExtractGroups(false); //This makes the .obj reader import into a single geometry object instead of multiple
objReader.SetImportFilePath(readFrom);
if (!objReader.RunImport())
{
return;
}
// Get geometry and materials from importer
spGeometryData originalGeometry = objReader.GetFirstGeometry(); //Only contains a single geom, so "first" is fine
spMaterialTable originalMaterialTable = objReader.GetMaterials();
//Create a copy of the original geometry on which we will run the reduction
spGeometryData lodGeometry = originalGeometry.NewCopy(true);
// Create the reduction-processor, and set the geometry to reduce
spReductionProcessor reductionProcessor = sdk.CreateReductionProcessor();
reductionProcessor.SetGeometry(lodGeometry);
///////////////////////////////////////////////////////////////////////////////////////////////
// SETTINGS
// The reduction settings object contains settings pertaining to the actual decimation
spReductionSettings reductionSettings = reductionProcessor.GetReductionSettings();
reductionSettings.SetReductionHeuristics((uint)ReductionHeuristics.SG_REDUCTIONHEURISTICS_FAST); //Choose between "fast" and "consistent" processing.
// The normal calculation settings deal with the normal-specific reduction settings
spNormalCalculationSettings normalSettings = reductionProcessor.GetNormalCalculationSettings();
normalSettings.SetReplaceNormals(true); //If true, this will turn off normal handling in the reducer and recalculate them all afterwards instead.
normalSettings.SetHardEdgeAngle(70.0f); //If the normals are recalculated, this sets the hard-edge angle.
// The actual reduction triangle target are controlled by these three settings
reductionSettings.SetStopCondition((uint)StopCondition.SG_STOPCONDITION_EITHER_IS_REACHED); //The reduction stops when either of the targets is reached
reductionSettings.SetReductionRatio(0.0f); //Never stop at a triangle percentage, will hit MaxDeviation instead.
//END SETTINGS
///////////////////////////////////////////////////////////////////////////////////////////////
//Create an .obj exporter to save our result
spWavefrontExporter objExporter = sdk.CreateWavefrontExporter();
objExporter.SetSingleGeometry(lodGeometry); //This is the geometry we set as the processing geom of the reducer
objExporter.SetMaterials(originalMaterialTable); //Same materials as original
//Set reduction targets using on-screen size to set the maximum deviation
originalGeometry.CalculateExtents(true); //This calculates the bounds of the geometry
float[] geometryInf = new float[3];
float[] geometrySup = new float[3];
originalGeometry.GetInf(geometryInf);
originalGeometry.GetSup(geometrySup);
float geometryDiagonalLength = (float)Math.Sqrt((double)((geometrySup[0] - geometryInf[0]) * (geometrySup[0] - geometryInf[0]) +
(geometrySup[1] - geometryInf[1]) * (geometrySup[1] - geometryInf[1]) +
(geometrySup[2] - geometryInf[2]) * (geometrySup[2] - geometryInf[2])));
float[] maxDeviationTargets = new float[3]; //To find an approximate MaxDeviation for a pixelsize on screen, we just divide the diagonal by our wanted pixelsize
maxDeviationTargets[0] = geometryDiagonalLength / 500.0f; //Gives a deviation of max 1 pixel at ~500 pixels on-screen
maxDeviationTargets[1] = geometryDiagonalLength / 100.0f; //Gives a deviation of max 1 pixel at ~100 pixels on-screen
maxDeviationTargets[2] = geometryDiagonalLength / 50.0f; //Gives a deviation of max 1 pixel at ~50 pixels on-screen
//Generate the output filenames
string[] outputGeomFilename = new string[3];
outputGeomFilename[0] = writeToLod1 + ".obj";
outputGeomFilename[1] = writeToLod2 + ".obj";
outputGeomFilename[2] = writeToLod3 + ".obj";
// Run the iterative processing, saving the output geometry after every process
for (int reductionIteration = 0; reductionIteration < 3; ++reductionIteration)
{
// The geometry still uses the same pointer, so it does not need to be re-set for the exporter or reducer after each pass.
reductionSettings.SetMaxDeviation(maxDeviationTargets[reductionIteration]); //Stops when an error of the specified size has been reached.
reductionProcessor.RunProcessing();
// Do the exporting
objExporter.SetMaterialFilePath(null); //Reset the material file path so it's set by ExportFilePath
objExporter.SetExportFilePath(outputGeomFilename[reductionIteration]);
if (!objExporter.RunExport())
{
Console.WriteLine("Failed to write target file");
}
}
//Done! 3 cascaded LODs created.
}
static void RunReductionProcessing(ISimplygonSDK sdk, spScene scene, float max_dev, float keep_bone_ratio)
{
// Create the reduction processor. Set the scene that is to be processed
spReductionProcessor red = sdk.CreateReductionProcessor();
red.SetSceneRoot(scene.GetRootNode());
///////////////////////////////////////////////////
// Set the bone settings
spBoneSettings boneSettings = red.GetBoneSettings();
// Reduce bones based on percentage of bones in the scene.
// Bone lod process tells the reduction processor the method
// to use for bone reduction.
boneSettings.SetBoneLodProcess((uint)BoneRemovalProcessing.SG_BONEPROCESSING_RATIO_PROCESSING);
// Set the ratio of bones to keep in the scene
boneSettings.SetBoneLodRatio(keep_bone_ratio);
///////////////////////////////////////////////////
//
// Set the Repair Settings. Current settings will mean that all visual gaps will remain in the geometry and thus
// hinder the reduction on geometries that contains gaps, holes and t-junctions.
spRepairSettings repair_settings = red.GetRepairSettings();
// Only vertices that actually share the same position will be welded together
repair_settings.SetWeldDist(0.0f);
// Only t-junctions with no actual visual distance will be fixed.
repair_settings.SetTjuncDist(0.0f);
///////////////////////////////////////////////////
//
// Set the Reduction Settings.
spReductionSettings reduction_settings = red.GetReductionSettings();
// These flags will make the reduction process respect group and material setups,
// as well as preserve UV coordinates.
FeatureFlags BorderFlagsMask = 0;
BorderFlagsMask |= FeatureFlags.SG_FEATUREFLAGS_GROUP;
BorderFlagsMask |= FeatureFlags.SG_FEATUREFLAGS_MATERIAL;
BorderFlagsMask |= FeatureFlags.SG_FEATUREFLAGS_TEXTURE0;
reduction_settings.SetFeatureFlags((uint)BorderFlagsMask);
// Reduce until we reach max deviation.
reduction_settings.SetMaxDeviation(max_dev);
///////////////////////////////////////////////////
//
// Set the Normal Calculation Settings.
spNormalCalculationSettings normal_settings = red.GetNormalCalculationSettings();
// Will completely recalculate the normals.
normal_settings.SetReplaceNormals(true);
normal_settings.SetHardEdgeAngle(90.0f);
// Run the process
red.RunProcessing();
}
