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 bool run_remeshing_for_lod(ISimplygonSDK sdk, int lod_index, uint merge_distance)
{
string userProfileDirectory = System.Environment.GetEnvironmentVariable("USERPROFILE");
string assetRoot = userProfileDirectory + @"/Documents/SimplygonSDK/SourceCode/Assets/";
string tempRoot = @"../../../../../temp/";
string output_filename = string.Format(tempRoot + "wall_lod{0}_merge{1}.obj", lod_index + 1, merge_distance);
string output_material_filename = string.Format(tempRoot + "wall_lod{0}_merge{1}.mtl", lod_index + 1, merge_distance);
string output_diffuse_filename = string.Format(tempRoot + "wall_lod{0}_merge{1}_diffuse.png", lod_index + 1, merge_distance);
string output_normals_filename = string.Format(tempRoot + "wall_lod{0}_merge{1}_normals.png", lod_index + 1, merge_distance);
// Import source geometry
spGeometryData geom;
spMaterialTable materials;
Console.WriteLine("Importing wavefront .obj file...\n");
{
// Run import
spWavefrontImporter importer = sdk.CreateWavefrontImporter();
importer.SetExtractGroups(false); // We only want one large geometry, no need to extract groups
importer.SetImportFilePath(assetRoot + "wall.obj");
if (!importer.RunImport())
{
Console.WriteLine("Could not open input test file");
return(false);
}
// Get the only geometry and the materials
geom = importer.GetFirstGeometry();
materials = importer.GetMaterials();
}
// Make a copy of the geometry, we need the original for texture casting later.
// The remesher will replace the data of the geometry after it has processed it.
spGeometryData red_geom = geom.NewCopy(true);
// Create a Scene-object and a SceneMesh-object.
// Place the red_geom into the SceneMesh, and then the SceneMesh as a child to the RootNode.
spScene scene = sdk.CreateScene();
spSceneMesh mesh = sdk.CreateSceneMesh();
mesh.SetGeometry(red_geom);
mesh.SetName(red_geom.GetName().GetText());
scene.GetRootNode().AddChild(mesh);
spMappingImage mapping_image;
// Remesh it
Console.WriteLine("Running remesher...\n");
{
spRemeshingProcessor remesher = sdk.CreateRemeshingProcessor();
// Set target on-screen size in pixels
remesher.GetRemeshingSettings().SetOnScreenSize(lod_sizes[lod_index]);
// Set the on-screen merge distance in pixels. Holes smaller than this will be sealed
// and geometries closer to each other than this will be merged.
remesher.GetRemeshingSettings().SetMergeDistance(merge_distance);
// Disable the cutting plane
remesher.GetRemeshingSettings().SetUseGroundPlane(false);
// Set to generate mapping image for texture casting.
remesher.GetMappingImageSettings().SetGenerateMappingImage(true);
remesher.SetSceneRoot(scene.GetRootNode());
remesher.RemeshGeometry();
// Mapping image is needed later on for texture casting.
mapping_image = remesher.GetMappingImage();
}
spSceneMesh topmesh = Utils.SimplygonCast <spSceneMesh>(scene.GetRootNode().GetChild(0), false);
// Cast diffuse texture and normal map data into a new material
// Create new material table.
spMaterialTable output_materials = sdk.CreateMaterialTable();
// Create new material for the table.
spMaterial output_material = sdk.CreateMaterial();
output_materials.AddMaterial(output_material);
// Cast diffuse texture data
{
// Cast the data using a color caster
spColorCaster cast = sdk.CreateColorCaster();
cast.SetColorType(SimplygonSDK.SG_MATERIAL_CHANNEL_DIFFUSE);
cast.SetSourceMaterials(materials);
cast.SetMappingImage(mapping_image); // The mapping image we got from the remeshing process.
cast.SetOutputChannels(3); // RGB, 3 channels! (1 would be for grey scale, and 4 would be for RGBA.)
cast.SetOutputChannelBitDepth(8); // 8 bits per channel. So in this case we will have 24bit colors RGB.
cast.SetDilation(10); // To avoid mip-map artifacts, the empty pixels on the map needs to be filled to a degree aswell.
cast.SetOutputFilePath(output_diffuse_filename); // Where the texture map will be saved to file.
cast.CastMaterials(); // Fetch!
// set the material properties
// Set the diffuse multiplier for the texture. 1 means it will not differ from original texture,
// For example: 0 would ignore a specified color and 2 would make a color twice as pronounced as the others.
output_material.SetDiffuseRed(1);
output_material.SetDiffuseGreen(1);
output_material.SetDiffuseBlue(1);
// Set material to point to created texture filename.
output_material.SetTexture(SimplygonSDK.SG_MATERIAL_CHANNEL_DIFFUSE, output_diffuse_filename);
}
// cast normal map texture data
{
// cast the data using a color caster
spNormalCaster cast = sdk.CreateNormalCaster();
cast.SetSourceMaterials(materials);
cast.SetMappingImage(mapping_image);
cast.SetOutputChannels(3); // RGB, 3 channels! (But really the x, y and z values for the normal)
cast.SetOutputChannelBitDepth(8);
cast.SetDilation(10);
cast.SetOutputFilePath(output_normals_filename);
cast.CastMaterials();
// Set material to point to created texture filename.
output_material.SetTexture(SimplygonSDK.SG_MATERIAL_CHANNEL_NORMALS, output_normals_filename);
}
// export the remeshed geometry to an OBJ file
Console.WriteLine("Exporting wavefront .obj file...\n");
{
spWavefrontExporter exporter = sdk.CreateWavefrontExporter();
exporter.SetExportFilePath(output_filename);
exporter.SetSingleGeometry(topmesh.GetGeometry());
exporter.SetMaterials(output_materials);
if (!exporter.RunExport())
{
Console.WriteLine("Failed to write result");
return(false);
}
}
return(true);
}