public static string RenderableToObjFile(IRenderable mesh)
{
int vertCount = mesh.Verts.Vertices.Length;
int triCount = mesh.Verts.Tris;
ObjBuilder objString = new ObjBuilder();
WriteOBJHeader(objString, vertCount, triCount);
// fix OBJ export transformation
Matrix4 rotateX180 = Matrix4.CreateRotationX(MathHelper.DegreesToRadians(-180));
foreach (var vert in mesh.Verts.Vertices)
{
objString.Vertex(Vector3.TransformPosition(vert.Position, mesh.Transform.Matrix * rotateX180));
}
foreach (var vert in mesh.Verts.Vertices)
{
objString.Normal(vert.Normal);
}
foreach (var vert in mesh.Verts.Vertices)
{
objString.UV(vert.TexCoord);
}
ObjFaceBuilder faceBuilder = new ObjFaceBuilder();
for (int i = 0; i < mesh.Verts.Indices.Length; i += 3)
{
// plus 1 here as OBJ is not zero-indexed
int idx1 = mesh.Verts.Indices[i] + 1;
int idx2 = mesh.Verts.Indices[i + 1] + 1;
int idx3 = mesh.Verts.Indices[i + 2] + 1;
faceBuilder.Vertex(idx1, idx1, idx1);
faceBuilder.Vertex(idx2, idx2, idx2);
faceBuilder.Vertex(idx3, idx3, idx3);
objString.Face(faceBuilder.Build());
faceBuilder.Clear();
}
return(objString.ToString());
}
public static string RenderableListToObjFile(List <IRenderable> meshes)
{
int vertCount = 0;
int triCount = 0;
foreach (var mesh in meshes)
{
vertCount += mesh.Verts.Vertices.Length;
triCount += mesh.Verts.Tris;
}
ObjBuilder objString = new ObjBuilder();
WriteOBJHeader(objString, vertCount, triCount);
List <Vector3> positions = new List <Vector3>();
List <Vector3> normals = new List <Vector3>();
List <Vector2> uvs = new List <Vector2>();
foreach (var mesh in meshes)
{
foreach (var vert in mesh.Verts.Vertices)
{
positions.Add(Vector3.TransformPosition(vert.Position, mesh.Transform.Matrix));
normals.Add(vert.Normal);
uvs.Add(vert.TexCoord);
}
}
foreach (var pos in positions)
{
objString.Vertex(pos);
}
foreach (var norm in normals)
{
objString.Normal(norm);
}
foreach (var uv in uvs)
{
objString.UV(uv);
}
int faceBase = 0;
int meshNumber = 0;
foreach (var mesh in meshes)
{
objString.Group($"Mesh {meshNumber}");
ObjFaceBuilder faceBuilder = new ObjFaceBuilder();
for (int i = 0; i < mesh.Verts.Length; i += 3)
{
int objIndex1 = faceBase + mesh.Verts.Indices[i] + 1;
int objIndex2 = faceBase + mesh.Verts.Indices[i + 2] + 1;
int objIndex3 = faceBase + mesh.Verts.Indices[i + 1] + 1;
faceBuilder.Vertex(objIndex1, objIndex1, objIndex1);
faceBuilder.Vertex(objIndex2, objIndex2, objIndex2);
faceBuilder.Vertex(objIndex3, objIndex3, objIndex3);
objString.Face(faceBuilder.Build());
faceBuilder.Clear();
}
meshNumber++;
faceBase += mesh.Verts.Vertices.Length;
}
return(objString.ToString());
}
public static string TMDToOBJFile(TMD tmd)
{
int vertCount = (int)tmd.NumberOfVertices;
int faceCount = 0;
foreach (var tmdObj in tmd.ObjectTable)
{
faceCount += (int)tmdObj.NumPrimitives;
}
ObjBuilder obj = new ObjBuilder();
WriteOBJHeader(obj, vertCount, faceCount);
List <Vector3> positions = new List <Vector3>();
List <Vector3> normals = new List <Vector3>();
foreach (var tmdObj in tmd.ObjectTable)
{
foreach (Vec3 vert in tmdObj.Vertices)
{
positions.Add(new Vector3(vert.X, vert.Y, vert.Z));
}
foreach (var norm in tmdObj.Normals)
{
normals.Add(new Vector3(norm.X, norm.Y, norm.Z));
}
}
foreach (var pos in positions)
{
obj.Vertex(pos);
}
foreach (var norm in normals)
{
obj.Normal(norm);
}
foreach (var tmdObj in tmd.ObjectTable)
{
foreach (var prim in tmdObj.Primitives)
{
if (prim.PacketData is ITMDTexturedPrimitivePacket uvPacket)
{
for (int j = 0; j < prim.PacketData.Vertices.Length; j++)
{
int uvIndex = j * 2;
obj.UV(new Vector2(uvPacket.UVs[uvIndex] / 255f, uvPacket.UVs[uvIndex + 1] / 255f));
}
}
}
}
ObjFaceBuilder faceBuilder = new ObjFaceBuilder();
int indexBase = 0;
for (int i = 0; i < tmd.Header.NumObjects; i++)
{
obj.Group($"Object {i}");
int uvCount = 1;
foreach (var prim in tmd.ObjectTable[i].Primitives)
{
ITMDPrimitivePacket primitivePacket = prim.PacketData;
ITMDTexturedPrimitivePacket texPrimitivePacket = prim.PacketData as ITMDTexturedPrimitivePacket;
ITMDLitPrimitivePacket litPrimitivePacket = prim.PacketData as ITMDLitPrimitivePacket;
int[] indices = new int[primitivePacket.Vertices.Length];
for (int vert = 0; vert < primitivePacket.Vertices.Length; vert++)
{
int v = indexBase + primitivePacket.Vertices[vert] + 1;
indices[vert] = v;
int?t = null;
int?n = null;
if (texPrimitivePacket != null)
{
t = uvCount++;
}
if (litPrimitivePacket != null)
{
n = litPrimitivePacket.Normals[vert] + 1;
}
}
bool isQuad = (prim.Options & TMDPrimitivePacket.OptionsFlags.Quad) != 0;
bool isDoubleSided = (prim.Flags & TMDPrimitivePacket.PrimitiveFlags.DoubleSided) != 0;
faceBuilder.Vertex(indices[1]);
faceBuilder.Vertex(indices[0]);
faceBuilder.Vertex(indices[2]);
obj.Face(faceBuilder.Build());
faceBuilder.Clear();
if (isQuad)
{
faceBuilder.Vertex(indices[1]);
faceBuilder.Vertex(indices[2]);
faceBuilder.Vertex(indices[3]);
obj.Face(faceBuilder.Build());
faceBuilder.Clear();
}
if (isDoubleSided)
{
obj.Comment("DOuble sided!");
faceBuilder.Vertex(indices[0]);
faceBuilder.Vertex(indices[1]);
faceBuilder.Vertex(indices[2]);
obj.Face(faceBuilder.Build());
faceBuilder.Clear();
if (isQuad)
{
faceBuilder.Vertex(indices[2]);
faceBuilder.Vertex(indices[1]);
faceBuilder.Vertex(indices[3]);
obj.Face(faceBuilder.Build());
faceBuilder.Clear();
}
}
faceBuilder.Clear();
}
indexBase += tmd.ObjectTable[i].Vertices.Length;
}
return(obj.ToString());
}
public static string RenderableListToObjFile(IEnumerable <IRenderable> meshes, bool combine = false)
{
int vertCount = 0;
int triCount = 0;
IEnumerable <IRenderable> renderables = meshes as IRenderable[] ?? meshes.ToArray();
foreach (var mesh in renderables)
{
vertCount += mesh.Verts.Vertices.Length;
triCount += mesh.Verts.Tris;
}
ObjBuilder objString = new ObjBuilder();
WriteOBJHeader(objString, vertCount, triCount);
List <Vector3> positions = new List <Vector3>();
List <Vector3> normals = new List <Vector3>();
List <Vector2> uvs = new List <Vector2>();
// fix OBJ export transformation
Matrix4 rotateX180 = Matrix4.CreateRotationX(MathHelper.DegreesToRadians(-180));
foreach (var mesh in renderables)
{
foreach (var vert in mesh.Verts.Vertices)
{
positions.Add(Vector3.TransformPosition(vert.Position, mesh.Transform.Matrix * rotateX180));
normals.Add(vert.Normal);
uvs.Add(vert.TexCoord);
}
}
foreach (var pos in positions)
{
objString.Vertex(pos);
}
foreach (var norm in normals)
{
objString.Normal(norm);
}
foreach (var uv in uvs)
{
objString.UV(uv);
}
int faceBase = 0;
int meshNumber = 0;
foreach (var mesh in renderables)
{
// if we're not combining the meshes then we need to make groups for each
if (!combine)
{
objString.Group($"Mesh {meshNumber}");
}
ObjFaceBuilder faceBuilder = new ObjFaceBuilder();
for (int i = 0; i < mesh.Verts.Length; i += 3)
{
int objIndex1 = faceBase + mesh.Verts.Indices[i] + 1;
int objIndex2 = faceBase + mesh.Verts.Indices[i + 1] + 1;
int objIndex3 = faceBase + mesh.Verts.Indices[i + 2] + 1;
faceBuilder.Vertex(objIndex1, objIndex1, objIndex1);
faceBuilder.Vertex(objIndex2, objIndex2, objIndex2);
faceBuilder.Vertex(objIndex3, objIndex3, objIndex3);
objString.Face(faceBuilder.Build());
faceBuilder.Clear();
}
meshNumber++;
faceBase += mesh.Verts.Vertices.Length;
}
return(objString.ToString());
}