public MeshExportOptions(Matrix4x4 matrix,
MeshNormalExportMode normalExportMode = MeshNormalExportMode.Unchanged,
bool invertNormals = false,
bool reverseFaceWinding = false) {
Matrix = matrix;
NormalExportMode = normalExportMode;
InvertNormals = invertNormals;
ReverseFaceWinding = reverseFaceWinding;
}
private IModel ImportMesh(byte[] bytes)
{
int stride = 1;
MeshNormalExportMode shadingMode = MeshNormalExportMode.Unchanged;
HWBinaryResourceChunk headerChunk =
GetFirstChunkOfType(HWBinaryResourceChunkType.XTD_XTDHeader);
float tileScale =
BinaryUtils.ReadFloatBigEndian(bytes,
(int)headerChunk.Offset + 12);
HWBinaryResourceChunk atlasChunk =
GetFirstChunkOfType(HWBinaryResourceChunkType.XTD_AtlasChunk);
int gridSize =
(int)Math.Round(Math.Sqrt((atlasChunk.Size - 32) /
8)); // Subtract the min/range vector sizes, divide by position + normal size, and sqrt for grid size
int positionOffset = (int)atlasChunk.Offset + 32;
int normalOffset = positionOffset + gridSize * gridSize * 4;
if (gridSize % stride != 0)
{
throw new Exception(
$"Grid size {gridSize} is not evenly divisible by stride {stride} - choose a different stride value.");
}
// These are stored as ZYX, 4 bytes per component
Vector3 PosCompMin = BinaryUtils
.ReadVector3BigEndian(
bytes, (int)atlasChunk.Offset)
.ReverseComponents();
Vector3 PosCompRange =
BinaryUtils
.ReadVector3BigEndian(bytes, (int)atlasChunk.Offset + 16)
.ReverseComponents();
var finModel = new ModelImpl(gridSize * gridSize);
var finMesh = finModel.Skin.AddMesh();
var finVertices = new IVertex[gridSize * gridSize];
// Read vertex offsets/normals and add them to the mesh
for (int x = 0; x < gridSize; x += stride)
{
for (int z = 0; z < gridSize; z += stride)
{
int index =
ConvertGridPositionToIndex(new Tuple <int, int>(x, z), gridSize);
int offset = index * 4;
// Get offset position and normal for this vertex
Vector3 position =
ReadVector3Compressed(bytes, positionOffset + offset) *
PosCompRange -
PosCompMin;
// Positions are relative to the terrain grid, so shift them by the grid position
position += new Vector3(x, 0, z) * tileScale;
Vector3 normal =
ConvertDirectionVector(
Vector3.Normalize(
ReadVector3Compressed(bytes, normalOffset + offset) *
2.0f -
Vector3.One));
// Simple UV based on original, non-warped terrain grid
Vector3 texCoord = new Vector3(x / ((float)gridSize - 1),
z / ((float)gridSize - 1), 0);
var finVertex =
finModel.Skin
.AddVertex(position.X, position.Y, position.Z)
.SetLocalNormal(normal.X, normal.Y, normal.Z)
.SetUv(texCoord.X, texCoord.Y);
finVertices[GetVertexIndex(x, z, gridSize)] = finVertex;
}
}
// Generate faces based on terrain grid
for (int x = 0; x < gridSize - stride; x += stride)
{
var triangles = new List <(IVertex, IVertex, IVertex)>();
for (int z = 0; z < gridSize - stride; z += stride)
{
var a = finVertices[GetVertexIndex(x, z, gridSize)];
var b = finVertices[GetVertexIndex(x + stride, z, gridSize)];
var c = finVertices[GetVertexIndex(x, z + stride, gridSize)];
var d = finVertices[GetVertexIndex(x + stride, z + stride, gridSize)];
triangles.Add((a, b, c));
triangles.Add((d, c, b));
}
finMesh.AddTriangles(triangles.ToArray());
triangles.Clear();
}
return(finModel);
}