private static void RunHighQualityReduction(ISimplygonSDK SDK, string writeTo)
{
const int vertex_count = 12;
const int triangle_count = 4;
// 4 triangles x 3 indices ( or 3 corners )
int[] corner_ids = { 0, 1, 2,
3, 4, 5,
6, 7, 8,
9, 10, 11 };
// 12 vertices with values for the x, y and z coordinates.
float[] vertex_coordinates = { 0.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
1.0f, 1.0f, 0.0f,
1.0f, 1.0f, 0.0f,
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
2.0f, 0.0f, 0.0f,
2.0f, 1.0f, 0.0f,
2.0f, 1.0f, 0.0f,
1.0f, 1.0f, 0.0f,
1.0f, 0.0f, 0.0f };
spGeometryData g = SDK.CreateGeometryData();
spRealArray coords = g.GetCoords();
spRidArray ids = g.GetVertexIds();
g.SetVertexCount(vertex_count);
g.SetTriangleCount(triangle_count);
for (int i = 0; i < vertex_count; ++i)
{
//coords.SetTuple(i, vertex_coordinates[i * 3]);
//coords[i] = vertex_coordinates[i * 3];
float[] v = { 0.0f, 0.0f, 0.0f };
for (int j = 0; j < 3; ++j)
{
v[j] = vertex_coordinates[i * 3 + j];
}
coords.SetTuple(i, v);
}
for (int i = 0; i < corner_ids.Length; ++i)
{
ids.SetItem(i, corner_ids[i]);
}
// Create the reduction-processor, and set which scene to reduce
using (var reductionProcessor = SDK.CreateReductionProcessor())
{
spScene scene = SDK.CreateScene();
spSceneNode root = scene.GetRootNode();
spSceneMesh meshNode = SDK.CreateSceneMesh();
meshNode.SetGeometry(g);
//auto meshTransform = meshNode->GetRelativeTransform();
//meshTransform->SetToTranslationTransform(100, 0, 0);
root.AddChild(meshNode);
reductionProcessor.SetSceneRoot(root);
///////////////////////////////////////////////////////////////////////////////////////////////
// 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
var reductionSettings = reductionProcessor.GetReductionSettings();
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 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 settings
reductionSettings.SetStopCondition((uint)StopCondition.SG_STOPCONDITION_EITHER_IS_REACHED); //The reduction stops when any of the targets below is reached
reductionSettings.SetReductionRatio(0.5f); //Targets at 50% of the original triangle count
reductionSettings.SetMaxDeviation(float.MaxValue); //Targets when an error of the specified size has been reached. As set here it never happens.
// The repair settings object contains settings to fix the geometries
var 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
var 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();
// For this reduction, the LOD will use the same material set as the original, and hence no further processing is required
//Create an .obj exporter to save our result
using (var objExporter = SDK.CreateWavefrontExporter())
{
// Generate the output filenames
string outputGeomFilename = writeTo + ".obj";
spSceneMesh topmesh = Utils.SimplygonCast <spSceneMesh>(scene.GetRootNode().GetChild(0), false);
// Do the actual exporting
objExporter.SetExportFilePath(outputGeomFilename);
objExporter.SetSingleGeometry(topmesh.GetGeometry()); //This is the geometry we set as the processing geom of the reducer, retaining the materials in the original scene
objExporter.RunExport();
//Done! LOD 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);
}
