/// <summary>
/// Exports the specified model as an obj file with a texture
/// </summary>
/// <param name="models">The models to combine and export</param>
public void ExportModelsAsObj(List <VModel> models)
{
var objMeshes = new List <ObjMesh>();
var animations = GetAllAnimations(models[0]);
var animation = animations.First(a => a.Name.Contains("idle"));
foreach (var model in models)
{
var objMesh = new ObjMesh();
// Load mesh
var meshes = LoadModelMeshes(model);
var mesh = meshes[0].Mesh;
LoadVMeshIntoMesh(objMesh, mesh);
// Apply animation
var animMatrices = animation.GetAnimationMatrices(0, model.GetSkeleton(0));
if (objMesh.BlendWeights.Count == 0 && objMesh.BlendIndices.Count != 0)
{
objMesh.BlendWeights = objMesh.BlendIndices.Select(idxs => new Vector4((float)0.25, (float)0.25, (float)0.25, (float)0.25)).ToList();
}
for (int i = 0; i < objMesh.VertexCount; i++)
{
var position = objMesh.Positions[i];
var resultVectors = new List <Vector3>();
float[] weights = new float[]
{
objMesh.BlendWeights[i].X,
objMesh.BlendWeights[i].Y,
objMesh.BlendWeights[i].Z,
objMesh.BlendWeights[i].W,
};
for (int m = 0; m < 4; m++)
{
var matrixIndex = (int)objMesh.BlendIndices[i][m];
resultVectors.Add(Vector3.Multiply(Vector3.Transform(position, animMatrices[matrixIndex]), weights[m]));
}
objMesh.Positions[i] = resultVectors.Aggregate((v1, v2) => Vector3.Add(v1, v2));
}
// Add to list
objMeshes.Add(objMesh);
}
// Merge all objMeshes into one
// - merge textures and fix tex coords
// - create one final merged texture
// - append all vertex points, and fix indexes
// - also make sure original v texcoords start in 0-1(wrapping dont work well with our new method)
//
var finalMesh = new ObjMesh();
// Take the initial material as the base of the merged materials
finalMesh.Material = objMeshes.FirstOrDefault().Material.Clone();
var textureImages = objMeshes.Select(o => o.Material.TextureImage).ToList();
finalMesh.Material.TextureImage = ObjMaterial.StackImages(objMeshes.Select(o => o.Material.TextureImage).ToList());
finalMesh.Material.NormalsImage = ObjMaterial.StackImages(objMeshes.Select(o => o.Material.NormalsImage).ToList());
finalMesh.Material.SpecularImage = ObjMaterial.StackImages(objMeshes.Select(o => o.Material.SpecularImage).ToList());
float vCoord = 0;
foreach (var objMesh in objMeshes)
{
var startIndex = finalMesh.VertexCount;
finalMesh.Positions.AddRange(objMesh.Positions);
finalMesh.Normals.AddRange(objMesh.Normals);
float textureHeightModifier = (float)objMesh.Material.TextureImage.Height / finalMesh.Material.TextureImage.Height;
finalMesh.TextureCoords.AddRange(objMesh.TextureCoords.Select(uv =>
{
var v = uv.Y;
// Lock in to 0-1
while (v > 1)
{
v -= 1;
}
while (v < 0)
{
v += 1;
}
// Adjust for merged image
v = (v * textureHeightModifier) + vCoord;
return(new Vector2(uv.X, v));
}));
vCoord += textureHeightModifier;
objMesh.Faces.ForEach(f => f.ForEach(v => v.IncreaseIndexing(startIndex)));
finalMesh.Faces.AddRange(objMesh.Faces);
}
// Transform to be smaller and upright
//finalMesh.Positions = finalMesh.Positions.Select(v => v = Vector3.Transform(v, TRANSFORMSOURCETOSTANDARD)).ToList();
finalMesh.WriteToFiles("out");
}
/// <summary>
/// Loads the VMesh into our Objmesh
/// </summary>
/// <param name="objMesh">The objmesh to load into</param>
/// <param name="mesh">The VMesh to load</param>
private void LoadVMeshIntoMesh(ObjMesh objMesh, VMesh mesh)
{
var data = mesh.GetData();
var vbib = mesh.VBIB;
foreach (var sceneObject in data.GetArray("m_sceneObjects"))
{
foreach (var drawCall in sceneObject.GetArray("m_drawCalls"))
{
var startingVertexCount = objMesh.Positions.Count; // Set this so we can offset the indicies for triangles correctly
var vertexBufferInfo = drawCall.GetArray("m_vertexBuffers")[0]; // In what situation can we have more than 1 vertex buffer per draw call?
var vertexBufferIndex = (int)vertexBufferInfo.GetIntegerProperty("m_hBuffer");
var vertexBuffer = vbib.VertexBuffers[vertexBufferIndex];
var indexBufferInfo = drawCall.GetSubCollection("m_indexBuffer");
var indexBufferIndex = (int)indexBufferInfo.GetIntegerProperty("m_hBuffer");
var indexBuffer = vbib.IndexBuffers[indexBufferIndex];
// Set vertex attributes
foreach (var attribute in vertexBuffer.Attributes)
{
var buffer = ReadAttributeBuffer(vertexBuffer, attribute);
var numComponents = buffer.Length / vertexBuffer.Count;
if (attribute.Name == "BLENDINDICES")
{
var byteBuffer = buffer.Select(f => (byte)f).ToArray();
var rawBufferData = new byte[buffer.Length];
System.Buffer.BlockCopy(byteBuffer, 0, rawBufferData, 0, rawBufferData.Length);
var blendIndices = rawBufferData.ChunkBy(4);
objMesh.BlendIndices.AddRange(blendIndices);
continue;
}
if (attribute.Name == "BLENDWEIGHT")
{
var vectors = ToVector4Array(buffer);
objMesh.BlendWeights.AddRange(vectors);
}
if (attribute.Name == "POSITION")
{
var vectors = ToVector3Array(buffer);
objMesh.Positions.AddRange(vectors);
}
if (attribute.Name == "NORMAL")
{
if (VMesh.IsCompressedNormalTangent(drawCall))
{
var vectors = ToVector4Array(buffer);
var(normals, tangents) = DecompressNormalTangents(vectors);
objMesh.Normals.AddRange(normals);
}
else
{
var vectors = ToVector3Array(buffer);
objMesh.Normals.AddRange(vectors);
}
continue;
}
if (attribute.Name == "TEXCOORD")
{
if (numComponents != 2)
{
// ignore textcoords that arent 2
continue;
}
var vectors = ToVector2Array(buffer);
objMesh.TextureCoords.AddRange(vectors);
}
}
// Set index buffer
var startIndex = (int)drawCall.GetIntegerProperty("m_nStartIndex");
var indexCount = (int)drawCall.GetIntegerProperty("m_nIndexCount");
var indices = ReadIndices(indexBuffer, startIndex, indexCount);
var newFaces = indices.ChunkBy(3).Select(idxList => idxList.Select(idx => new ObjFaceVertex(idx + startingVertexCount)).ToList()).ToList();
objMesh.Faces.AddRange(newFaces);
var materialPath = drawCall.GetProperty <string>("m_material");
var materialResource = VpkLoader.LoadFile(materialPath + "_c");
var renderMaterial = (VMaterial)materialResource.DataBlock;
var matName = Path.GetFileNameWithoutExtension(materialPath);
if (objMesh.Material == null)
{
objMesh.Material = ObjMaterial.FromVMaterial(renderMaterial, Path.GetFileNameWithoutExtension(materialPath), VpkLoader);
}
else if (matName != objMesh.Material.Name)
{
// throw new Exception("2 different mats in same object");
}
}
}
}
