public static void EvaluateNormals(ModelMeshData mesh)
{
Vector3[] normals = new Vector3[mesh.Vertices.Count];
for (int i = 0; i != mesh.Vertices.Count; ++i )
normals[i] = Vector3.Zero;
Action<int, int, int, int> ProcessTriangle = delegate(int partIdx, int idx1, int idx2, int idx3)
{
List<short> indices = mesh.MeshParts[partIdx].Indices;
int[] idx = { indices[idx1], indices[idx2], indices[idx3] };
Vector3 side1 = mesh.Vertices[idx[1]] - mesh.Vertices[idx[0]];
Vector3 side2 = mesh.Vertices[idx[2]] - mesh.Vertices[idx[0]];
Vector3 norm = Vector3.Cross(side1, side2);
norm.Normalize();
for (int i = 0 ; i != 3; ++i)
normals[idx[i]] += norm;
};
if (mesh.TriangleStrip)
for (int j = 0; j != mesh.MeshParts.Count; ++j )
for (int i = 2; i < mesh.MeshParts[j].Indices.Count; ++i)
ProcessTriangle(j, i - 2, i - 1, i);
else
for (int j = 0; j != mesh.MeshParts.Count; ++j)
for (int i = 0; i < mesh.MeshParts[j].Indices.Count; i += 3)
ProcessTriangle(j, i, i + 1, i + 2);
for (int i = 0; i != normals.Length; ++i)
{
normals[i].Normalize();
normals[i] = normals[i];
}
mesh.Normals = new List<Vector3>(normals);
}
private void ParseStringSection(int size, SectionType parentType)
{
byte[] data = input.ReadBytes(size);
if (parentType == SectionType.Texture)
{
int len = Array.IndexOf(data, (byte)0);
if (len == -1)
{
len = data.Length;
}
if (len == 0)
{
return;
}
string textureName = Encoding.ASCII.GetString(data, 0, len);
if (texturesFolder != null)
{
Texture2D texture = TexturesStorage.Instance.GetTexture(textureName, texturesFolder);
if (texture != null)
{
ModelMeshData mesh = modelData.Meshes[modelData.Meshes.Count - 1];
Material material = mesh.Materials[mesh.Materials.Count - 1];
material.Texture = texture;
}
}
}
}
/// <summary>
/// Обрабатывает секцию MaterialSplit (она же Bin Mesh PLG)
/// Насколько я понял, эта секция нужна, когда отдельным кускам меша присваивается разный метариел (текстура),
/// либо когда треугольники перечисляются не в виде TriangleList, а в виде TriangleStrip.
///
/// Перезаписывает данные в последнем добавленном меше в modelData
/// </summary>
private void ParseMaterialSplit(int sectionSize)
{
int sectionEnd = (int)input.BaseStream.Position + sectionSize;
// ParseMaterialSplit вызывается всегда после ParseGeometry, которая добавляет новый mesh в modelData
ModelMeshData mesh = modelData.Meshes[modelData.Meshes.Count - 1];
int triangleStrip = input.ReadInt32();
int splitCount = input.ReadInt32();
mesh.SumIndicesCount = input.ReadInt32();
mesh.TriangleStrip = triangleStrip != 0;
mesh.MeshParts.Clear(); // перезаписываем данные о треугольниках
for (int j = 0; j < splitCount; ++j)
{
int localIndicesCount = input.ReadInt32();
int materialIdx = input.ReadInt32();
ModelMeshPartData meshPart = new ModelMeshPartData(localIndicesCount, materialIdx);
for (int i = 0; i != localIndicesCount; ++i)
{
meshPart.Indices.Add((short)input.ReadInt32());
}
mesh.MeshParts.Add(meshPart);
}
}
private void FillColors(ModelMeshData mesh, int verticesCount)
{
mesh.Colors = new List <Color>(verticesCount);
for (int i = 0; i != verticesCount; ++i)
{
mesh.Colors.Add(new Color(0, 0, 0, 1));
}
}
private static VertexBuffer CreateTexturedVertexBuffer(ModelMeshData mesh)
{
var vertices = new VertexPositionColorTexture[mesh.Vertices.Count];
for (var i = 0; i != mesh.Vertices.Count; ++i)
vertices[i] = new VertexPositionColorTexture(mesh.Vertices[i], mesh.Colors[i], mesh.TextureCoords[i]);
VertexBuffer vertexBuffer = new VertexBuffer(GraphicsDeviceHolder.Device,
mesh.Vertices.Count * VertexPositionColorTexture.SizeInBytes, BufferUsage.WriteOnly);
vertexBuffer.SetData(vertices);
return vertexBuffer;
}
private void ReadTextureCoords(ModelMeshData mesh, int verticesCount)
{
mesh.TextureCoords = new List <Vector2>(verticesCount);
for (var i = 0; i != verticesCount; ++i)
{
float x = input.ReadSingle();
float y = input.ReadSingle();
mesh.TextureCoords.Add(new Vector2(x, y));
}
}
private void ReadNormals(ModelMeshData mesh, int verticesCount)
{
mesh.Normals = new List <Vector3>(verticesCount);
for (var i = 0; i != verticesCount; ++i)
{
var x = input.ReadSingle();
var y = input.ReadSingle(); // y and z coords are exchanged because of different coordinate system
var z = input.ReadSingle();
mesh.Normals.Add(new Vector3(x, z, -y));
}
}
private void ReadColors(ModelMeshData mesh, int verticesCount)
{
mesh.Colors = new List <Color>(verticesCount);
for (int i = 0; i != verticesCount; ++i)
{
byte r = input.ReadByte();
byte g = input.ReadByte();
byte b = input.ReadByte();
byte a = input.ReadByte();
mesh.Colors.Add(new Color(r, g, b, a));
}
}
/// <summary>
/// Обрабатывает секцию Geometry
/// Считывает вершины, треугольники (индексы вершин), нормали, текстурные координаты.
/// </summary>
private void ParseGeometry(DffVersion version)
{
ModelMeshData mesh = new ModelMeshData();
GeometrySectionFlags flags = (GeometrySectionFlags)input.ReadInt16();
input.BaseStream.Seek(sizeof(short), SeekOrigin.Current); // unknown
int trianglesCount = input.ReadInt32();
int verticesCount = input.ReadInt32();
input.BaseStream.Seek(sizeof(int), SeekOrigin.Current); // morphTargetCount aka frameCount
if (version < DffVersion.GTA_VC_2)
{
// geometry has lighting data. Ignoring it.
// TODO :: we can use it for rendering!!!
input.BaseStream.Seek(12, SeekOrigin.Current);
}
if ((flags & GeometrySectionFlags.MultipleTextureCoords) != GeometrySectionFlags.None)
{
Log.Instance.Print("Multiple TexCoords sets are provided but used only the first of it!", MessageType.Warning);
}
if ((flags & GeometrySectionFlags.HasColorInfo) != GeometrySectionFlags.None)
{
ReadColors(mesh, verticesCount);
}
else
{
FillColors(mesh, verticesCount);
}
if ((flags & GeometrySectionFlags.HasTextureCoords) != GeometrySectionFlags.None)
{
ReadTextureCoords(mesh, verticesCount);
}
ReadTriangles(mesh, trianglesCount);
input.BaseStream.Seek(4 * sizeof(float), SeekOrigin.Current); // ignoring bounding sphere (x, y, z, radius)
input.BaseStream.Seek(2 * sizeof(int), SeekOrigin.Current); // hasPosition, hasNormal (not used)
ReadVertices(mesh, verticesCount);
if ((flags & GeometrySectionFlags.HasNormalsInfo) != GeometrySectionFlags.None)
{
ReadNormals(mesh, verticesCount);
}
modelData.Meshes.Add(mesh);
}
private static VertexBuffer CreateColoredVertexBuffer(ModelMeshData mesh)
{
var vertices = new VertexPositionColor[mesh.Vertices.Count];
for (var i = 0; i != mesh.Vertices.Count; ++i)
{
vertices[i] = new VertexPositionColor(mesh.Vertices[i], mesh.Colors[i]);
}
var vertexBuffer = new VertexBuffer(GraphicsDeviceHolder.Device,
mesh.Vertices.Count * VertexPositionColor.SizeInBytes, BufferUsage.WriteOnly);
vertexBuffer.SetData(vertices);
return(vertexBuffer);
}
private void ReadTriangles(ModelMeshData mesh, int trianglesCount)
{
ModelMeshPartData meshPart = new ModelMeshPartData(trianglesCount * 3, 0);
mesh.SumIndicesCount = trianglesCount * 3;
for (var i = 0; i != trianglesCount; ++i)
{
meshPart.Indices.Add(input.ReadInt16());
meshPart.Indices.Add(input.ReadInt16());
input.BaseStream.Seek(sizeof(short), SeekOrigin.Current); // skip index flags
meshPart.Indices.Add(input.ReadInt16());
}
mesh.MeshParts = new List <ModelMeshPartData>();
mesh.MeshParts.Add(meshPart);
}
private static ModelMesh3D CreateModelMesh(ModelMeshData mesh)
{
bool textured = mesh.TextureCoords != null;
var vertexBuffer = textured ? CreateTexturedVertexBuffer(mesh) : CreateColoredVertexBuffer(mesh);
List <ModelMeshPart3D> meshParts3d;
var indexBuffer = CreateIndexBuffer(mesh, out meshParts3d);
return(new ModelMesh3D(
new VertexDeclaration(GraphicsDeviceHolder.Device, textured? VertexPositionColorTexture.VertexElements : VertexPositionColor.VertexElements),
vertexBuffer,
indexBuffer,
mesh.TriangleStrip,
textured? VertexPositionColorTexture.SizeInBytes : VertexPositionColor.SizeInBytes,
mesh.Materials,
meshParts3d
));
}
private static ModelMesh3D CreateModelMesh(ModelMeshData mesh)
{
bool textured = mesh.TextureCoords != null;
var vertexBuffer = textured ? CreateTexturedVertexBuffer(mesh) : CreateColoredVertexBuffer(mesh);
List<ModelMeshPart3D> meshParts3d;
var indexBuffer = CreateIndexBuffer(mesh, out meshParts3d);
return new ModelMesh3D(
new VertexDeclaration(GraphicsDeviceHolder.Device, textured? VertexPositionColorTexture.VertexElements : VertexPositionColor.VertexElements),
vertexBuffer,
indexBuffer,
mesh.TriangleStrip,
textured? VertexPositionColorTexture.SizeInBytes : VertexPositionColor.SizeInBytes,
mesh.Materials,
meshParts3d
);
}
private static IndexBuffer CreateIndexBuffer(ModelMeshData mesh, out List<ModelMeshPart3D> meshParts3d)
{
var indexBuffer = new IndexBuffer(GraphicsDeviceHolder.Device, mesh.SumIndicesCount * sizeof(short),
BufferUsage.WriteOnly, IndexElementSize.SixteenBits);
meshParts3d = new List<ModelMeshPart3D>();
int offset = 0;
foreach (ModelMeshPartData part in mesh.MeshParts)
{
indexBuffer.SetData(offset * sizeof(short), part.Indices.ToArray(), 0, part.Indices.Count);
meshParts3d.Add(new ModelMeshPart3D(offset, mesh.TriangleStrip ? part.Indices.Count - 2 : part.Indices.Count / 3, part.MaterialId));
offset += part.Indices.Count;
}
if (offset != mesh.SumIndicesCount)
Utils.TerminateWithError("Incorrect total indices amount!");
return indexBuffer;
}
private void ParseMaterial(int sectionSize)
{
input.BaseStream.Seek(4, SeekOrigin.Current); // unknown data
byte[] color = input.ReadBytes(4);
input.BaseStream.Seek(4, SeekOrigin.Current); // unknown data
int textureCount = input.ReadInt32();
input.BaseStream.Seek(12, SeekOrigin.Current); // unknown data
if (textureCount != 0 && textureCount != 1)
{
Log.Instance.Print("Material section: unexpected TexturesCount value: " + textureCount);
}
ModelMeshData mesh = modelData.Meshes[modelData.Meshes.Count - 1];
mesh.Materials.Add(new Material()
{
Color = new Color(color[0], color[1], color[2], color[3])
});
}
private static IndexBuffer CreateIndexBuffer(ModelMeshData mesh, out List <ModelMeshPart3D> meshParts3d)
{
var indexBuffer = new IndexBuffer(GraphicsDeviceHolder.Device, mesh.SumIndicesCount * sizeof(short),
BufferUsage.WriteOnly, IndexElementSize.SixteenBits);
meshParts3d = new List <ModelMeshPart3D>();
int offset = 0;
foreach (ModelMeshPartData part in mesh.MeshParts)
{
indexBuffer.SetData(offset * sizeof(short), part.Indices.ToArray(), 0, part.Indices.Count);
meshParts3d.Add(new ModelMeshPart3D(offset, mesh.TriangleStrip ? part.Indices.Count - 2 : part.Indices.Count / 3, part.MaterialId));
offset += part.Indices.Count;
}
if (offset != mesh.SumIndicesCount)
{
Utils.TerminateWithError("Incorrect total indices amount!");
}
return(indexBuffer);
}
private void ReadVertices(ModelMeshData mesh, int verticesCount)
{
mesh.Vertices = new List<Vector3>(verticesCount);
for (var i = 0; i != verticesCount; ++i)
{
var x = input.ReadSingle();
var y = input.ReadSingle(); // y and z coords are exchanged because of different coordinate system
var z = input.ReadSingle();
mesh.Vertices.Add(new Vector3(x, z, -y));
}
}
private void ReadTriangles(ModelMeshData mesh, int trianglesCount)
{
ModelMeshPartData meshPart = new ModelMeshPartData(trianglesCount * 3, 0);
mesh.SumIndicesCount = trianglesCount * 3;
for (var i = 0; i != trianglesCount; ++i)
{
meshPart.Indices.Add(input.ReadInt16());
meshPart.Indices.Add(input.ReadInt16());
input.BaseStream.Seek(sizeof(short), SeekOrigin.Current); // skip index flags
meshPart.Indices.Add(input.ReadInt16());
}
mesh.MeshParts = new List<ModelMeshPartData>();
mesh.MeshParts.Add(meshPart);
}
private void ReadTextureCoords(ModelMeshData mesh, int verticesCount)
{
mesh.TextureCoords = new List<Vector2>(verticesCount);
for (var i = 0; i != verticesCount; ++i)
{
float x = input.ReadSingle();
float y = input.ReadSingle();
mesh.TextureCoords.Add(new Vector2(x, y));
}
}
private void ReadColors(ModelMeshData mesh, int verticesCount)
{
mesh.Colors = new List<Color>(verticesCount);
for (int i = 0; i != verticesCount; ++i)
{
byte r = input.ReadByte();
byte g = input.ReadByte();
byte b = input.ReadByte();
byte a = input.ReadByte();
mesh.Colors.Add(new Color(r, g, b, a));
}
}
/// <summary>
/// Обрабатывает секцию Geometry
/// Считывает вершины, треугольники (индексы вершин), нормали, текстурные координаты.
/// </summary>
private void ParseGeometry(DffVersion version)
{
ModelMeshData mesh = new ModelMeshData();
GeometrySectionFlags flags = (GeometrySectionFlags)input.ReadInt16();
input.BaseStream.Seek(sizeof(short), SeekOrigin.Current); // unknown
int trianglesCount = input.ReadInt32();
int verticesCount = input.ReadInt32();
input.BaseStream.Seek(sizeof(int), SeekOrigin.Current); // morphTargetCount aka frameCount
if (version < DffVersion.GTA_VC_2)
{
// geometry has lighting data. Ignoring it.
// TODO :: we can use it for rendering!!!
input.BaseStream.Seek(12, SeekOrigin.Current);
}
if ((flags & GeometrySectionFlags.MultipleTextureCoords) != GeometrySectionFlags.None)
Log.Instance.Print("Multiple TexCoords sets are provided but used only the first of it!", MessageType.Warning);
if ((flags & GeometrySectionFlags.HasColorInfo) != GeometrySectionFlags.None)
ReadColors(mesh, verticesCount);
else
FillColors(mesh, verticesCount);
if ((flags & GeometrySectionFlags.HasTextureCoords) != GeometrySectionFlags.None)
ReadTextureCoords(mesh, verticesCount);
ReadTriangles(mesh, trianglesCount);
input.BaseStream.Seek(4 * sizeof(float), SeekOrigin.Current); // ignoring bounding sphere (x, y, z, radius)
input.BaseStream.Seek(2 * sizeof(int), SeekOrigin.Current); // hasPosition, hasNormal (not used)
ReadVertices(mesh, verticesCount);
if ((flags & GeometrySectionFlags.HasNormalsInfo) != GeometrySectionFlags.None)
ReadNormals(mesh, verticesCount);
modelData.Meshes.Add(mesh);
}
private void FillColors(ModelMeshData mesh, int verticesCount)
{
mesh.Colors = new List<Color>(verticesCount);
for (int i = 0; i != verticesCount; ++i)
mesh.Colors.Add(new Color(0, 0, 0, 1));
}