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 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();
}
