public IGeometryModel ReadGeometry(int lod)
{
if (lod < 0 || lod >= ((IRenderGeometry)this).LodCount)
{
throw new ArgumentOutOfRangeException(nameof(lod));
}
using (var reader = cache.CreateReader(cache.DefaultAddressTranslator))
{
var model = new GeometryModel(item.FileName())
{
CoordinateSystem = CoordinateSystem.Default
};
var shaderRefs = Lightmaps.SelectMany(m => m.Materials)
.Where(m => m.ShaderReference.TagId >= 0)
.GroupBy(m => m.ShaderReference.TagId)
.Select(g => g.First().ShaderReference)
.ToList();
var shaderIds = shaderRefs.Select(r => r.TagId).ToList();
model.Materials.AddRange(Halo1Common.GetMaterials(shaderRefs, reader));
reader.Seek(SurfacePointer.Address, SeekOrigin.Begin);
var indices = reader.ReadEnumerable <ushort>(SurfaceCount * 3).ToArray();
var gRegion = new GeometryRegion {
Name = "Clusters"
};
int sectionIndex = 0;
foreach (var section in Lightmaps)
{
if (section.Materials.Count == 0)
{
continue;
}
var localIndices = new List <int>();
var vertices = new List <WorldVertex>();
var submeshes = new List <IGeometrySubmesh>();
var gPermutation = new GeometryPermutation
{
SourceIndex = Lightmaps.IndexOf(section),
Name = sectionIndex.ToString("D3", CultureInfo.CurrentCulture),
MeshIndex = sectionIndex,
MeshCount = 1
};
foreach (var submesh in section.Materials)
{
reader.Seek(submesh.VertexPointer.Address, SeekOrigin.Begin);
submeshes.Add(new GeometrySubmesh
{
MaterialIndex = (short)shaderIds.IndexOf(submesh.ShaderReference.TagId),
IndexStart = localIndices.Count,
IndexLength = submesh.SurfaceCount * 3
});
localIndices.AddRange(
indices.Skip(submesh.SurfaceIndex * 3)
.Take(submesh.SurfaceCount * 3)
.Select(i => i + vertices.Count)
);
var vertsTemp = reader.ReadEnumerable <WorldVertex>(submesh.VertexCount).ToList();
vertices.AddRange(vertsTemp);
}
gRegion.Permutations.Add(gPermutation);
model.Meshes.Add(new GeometryMesh
{
IndexFormat = IndexFormat.TriangleList,
VertexWeights = VertexWeights.None,
Indicies = localIndices.ToArray(),
Vertices = vertices.ToArray(),
Submeshes = submeshes
});
sectionIndex++;
}
model.Regions.Add(gRegion);
return(model);
}
}
