public static MeshData LoadFromFile(string filePath)
{
if (!File.Exists(filePath))
{
throw new FileNotFoundException($"Mesh file under {filePath} not found.");
}
var size = new FileInfo(filePath).Length;
var data = new MeshData();
using (var mmf = MemoryMappedFile.CreateFromFile(filePath, FileMode.Open))
{
using (var accessor = mmf.CreateViewAccessor(0, size))
{
accessor.Read(0, out int vertCount);
accessor.Read(sizeof(int), out int indicesCount);
data.verts.Capacity = vertCount;
data.indices.Capacity = indicesCount;
long pos = sizeof(int) * 2;
for (var i = 0; i < vertCount; ++i)
{
data.verts.Add(TreeUtility.MmvaReadVector3(accessor, ref pos));
}
for (var i = 0; i < indicesCount; ++i)
{
accessor.Read(pos, out int index);
data.indices.Add(index);
pos += sizeof(int);
}
}
}
return(data);
}
public static MeshData LoadFromFile(string filePath, long offset, long size)
{
if (!File.Exists(filePath))
{
throw new FileNotFoundException($"Mesh file under {filePath} not found.");
}
var data = new MeshData();
using (var mmf = MemoryMappedFile.CreateFromFile(File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.Read), null, 0L, MemoryMappedFileAccess.Read, HandleInheritability.None, false))
{
using (var accessor = mmf.CreateViewAccessor(offset, size, MemoryMappedFileAccess.Read))
{
accessor.Read(0, out int vertCount);
accessor.Read(sizeof(int), out int indicesCount);
data.verts.Capacity = vertCount;
data.indices.Capacity = indicesCount;
long pos = sizeof(int) * 2;
for (var i = 0; i < vertCount; ++i)
{
data.verts.Add(TreeUtility.MmvaReadVector3(accessor, ref pos));
}
for (var i = 0; i < indicesCount; ++i)
{
accessor.Read(pos, out int index);
data.indices.Add(index);
pos += sizeof(int);
}
}
}
return(data);
}
