static sMeshIndexerSetup stlIndexerSetup(int trianglesPerBatch)
{
sMeshIndexerSetup setup = new sMeshIndexerSetup();
setup.bytesPerVertex = 12;
setup.componentsInPosition = 3;
setup.verticesPerBatch = (uint)trianglesPerBatch * 3;
return(setup);
}
public static async Task <IndexedMesh> loadStlAsync(IRenderDevice device, Stream stream, float?minCosAngle, string name)
{
int triangles = readStlHeader(stream);
if (triangles <= 0)
{
throw new ArgumentException("Malformed STL file");
}
int trianglesPerBatch = Math.Min(triangles, 1024);
sMeshIndexerSetup setup = stlIndexerSetup(trianglesPerBatch);
using (var indexer = device.CreateMeshIndexer(ref setup))
{
Func <BoundingBox> fn = () => loadStlImpl(indexer, stream, triangles, trianglesPerBatch, minCosAngle);
BoundingBox bbox = await Task.Run(fn);
indexer.createMesh(out var vb, out var ib, out var metadata, nameVb(name), nameIb(name));
return(new IndexedMesh(vb, ib, metadata.countIndices, metadata.indexType, bbox));
}
}
public static IndexedMesh loadStl(IRenderDevice device, Stream stream, float?minCosAngle, string name)
{
int triangles = readStlHeader(stream);
if (triangles <= 0)
{
throw new ArgumentException("Malformed STL file");
}
// BTW, the default threshold for LOH is about 83kb, or 6.9k Vector3 vertices:
// https://docs.microsoft.com/en-us/dotnet/standard/garbage-collection/large-object-heap
int trianglesPerBatch = Math.Min(triangles, 1024);
sMeshIndexerSetup setup = stlIndexerSetup(trianglesPerBatch);
using (var indexer = device.CreateMeshIndexer(ref setup))
{
BoundingBox bbox = loadStlImpl(indexer, stream, triangles, trianglesPerBatch, minCosAngle);
indexer.createMesh(out var vb, out var ib, out var metadata, nameVb(name), nameIb(name));
return(new IndexedMesh(vb, ib, metadata.countIndices, metadata.indexType, bbox));
}
}
