public static void AssimpPRMConvert(string initialFilePath, string finalFilePath)
{
Assimp.AssimpContext context = new Assimp.AssimpContext();
context.SetConfig(new Assimp.Configs.FBXPreservePivotsConfig(false));
Assimp.Scene aiScene = context.ImportFile(initialFilePath, Assimp.PostProcessSteps.Triangulate | Assimp.PostProcessSteps.JoinIdenticalVertices | Assimp.PostProcessSteps.FlipUVs);
PRMModel prm = new PRMModel();
int totalVerts = 0;
//Iterate through and combine meshes. PRMs can only have a single mesh
IterateAiNodesPRM(prm, ref totalVerts, aiScene, aiScene.RootNode, Matrix4x4.Transpose(GetMat4FromAssimpMat4(aiScene.RootNode.Transform)));
AquaUtil.WritePRMToFile(prm, finalFilePath, 4);
}
private static void IterateAiNodesPRM(PRMModel prm, ref int totalVerts, Assimp.Scene aiScene, Assimp.Node node, Matrix4x4 parentTfm)
{
Matrix4x4 nodeMat = Matrix4x4.Transpose(GetMat4FromAssimpMat4(node.Transform));
nodeMat = Matrix4x4.Multiply(nodeMat, parentTfm);
foreach (int meshId in node.MeshIndices)
{
var mesh = aiScene.Meshes[meshId];
AddAiMeshToPRM(prm, ref totalVerts, mesh, nodeMat);
}
foreach (var childNode in node.Children)
{
IterateAiNodesPRM(prm, ref totalVerts, aiScene, childNode, nodeMat);
}
}
public static Assimp.Scene AssimpPRMExport(string filePath, PRMModel prm)
{
Assimp.Scene aiScene = new Assimp.Scene();
//Create an array to hold references to these since Assimp lacks a way to grab these by order or id
//We don't need the nodo count in this since they can't be parents
Assimp.Node[] boneArray = new Assimp.Node[2];
//Set up root node
var aiRootNode = new Assimp.Node("RootNode", null);
aiRootNode.Transform = Assimp.Matrix4x4.Identity;
boneArray[0] = aiRootNode;
aiScene.RootNode = aiRootNode;
//Set up single child node
var aiNode = new Assimp.Node(Path.GetFileNameWithoutExtension(filePath) + "_node", aiRootNode);
//Use inverse bind matrix as base
//Get local transform
aiNode.Transform = aiRootNode.Transform;
aiRootNode.Children.Add(aiNode);
boneArray[1] = aiNode;
//Mesh
string aiMeshName = Path.GetFileNameWithoutExtension(filePath);
var aiMesh = new Assimp.Mesh(aiMeshName, Assimp.PrimitiveType.Triangle);
//Vertex face data - PSO2 Actually doesn't do this, it just has per vertex data so we can just map a vertice's data to each face using it
//It may actually be possible to add this to the previous loop, but my reference didn't so I'm doing it in a separate loop for safety
//Reference: https://github.com/TGEnigma/Amicitia/blob/master/Source/AmicitiaLibrary/Graphics/RenderWare/RWClumpNode.cs
for (int vertId = 0; vertId < prm.vertices.Count; vertId++)
{
var prmVert = prm.vertices[vertId];
var pos = prmVert.pos * 100;
aiMesh.Vertices.Add(new Assimp.Vector3D(pos.X, pos.Y, pos.Z));
var nrm = prmVert.normal;
aiMesh.Normals.Add(new Assimp.Vector3D(nrm.X, nrm.Y, nrm.Z));
//Vert colors are bgra
var rawClr = prmVert.color;
var clr = new Assimp.Color4D(clrToFloat(rawClr[2]), clrToFloat(rawClr[1]), clrToFloat(rawClr[0]), clrToFloat(rawClr[3]));
aiMesh.VertexColorChannels[0].Add(clr);
var uv1 = prmVert.uv1;
var aiUV1 = new Assimp.Vector3D(uv1.X, uv1.Y, 0f);
aiMesh.TextureCoordinateChannels[0].Add(aiUV1);
var uv2 = prmVert.uv2;
var aiUV2 = new Assimp.Vector3D(uv2.X, uv2.Y, 0f);
aiMesh.TextureCoordinateChannels[1].Add(aiUV2);
}
//Handle rigid meshes
{
var aiBone = new Assimp.Bone();
var aqnBone = boneArray[0];
// Name
aiBone.Name = aiNode.Name;
// VertexWeights
for (int i = 0; i < aiMesh.Vertices.Count; i++)
{
var aiVertexWeight = new Assimp.VertexWeight(i, 1f);
aiBone.VertexWeights.Add(aiVertexWeight);
}
aiBone.OffsetMatrix = Assimp.Matrix4x4.Identity;
aiMesh.Bones.Add(aiBone);
}
//Faces
foreach (var face in prm.faces)
{
aiMesh.Faces.Add(new Assimp.Face(new int[] { (int)face.X, (int)face.Y, (int)face.Z }));
}
//Material
Assimp.Material mate = new Assimp.Material();
mate.ColorDiffuse = new Assimp.Color4D(1, 1, 1, 1);
mate.Name = aiMeshName + "_material";
mate.ShadingMode = Assimp.ShadingMode.Phong;
var meshNodeName = Path.GetFileNameWithoutExtension(filePath);
// Add mesh to meshes
aiScene.Meshes.Add(aiMesh);
// Add material to materials
aiScene.Materials.Add(mate);
// MaterialIndex
aiMesh.MaterialIndex = aiScene.Materials.Count - 1;
// Set up mesh node and add this mesh's index to it (This tells assimp to export it as a mesh for various formats)
var meshNode = new Assimp.Node(meshNodeName, aiScene.RootNode);
meshNode.Transform = Assimp.Matrix4x4.Identity;
aiScene.RootNode.Children.Add(meshNode);
meshNode.MeshIndices.Add(aiScene.Meshes.Count - 1);
return(aiScene);
}
private static void AddAiMeshToPRM(PRMModel prm, ref int totalVerts, Assimp.Mesh aiMesh, Matrix4x4 nodeMat)
{
//Convert vertices
for (int vertId = 0; vertId < aiMesh.VertexCount; vertId++)
{
PRMModel.PRMVert vert = new PRMModel.PRMVert();
var aiPos = aiMesh.Vertices[vertId];
var newPos = (new Vector3(aiPos.X, aiPos.Y, aiPos.Z));
vert.pos = Vector3.Transform(newPos, nodeMat) / 100;
if (aiMesh.HasVertexColors(0))
{
var aiColor = aiMesh.VertexColorChannels[0][vertId];
vert.color = new byte[] { (byte)(aiColor.B * 255), (byte)(aiColor.G * 255), (byte)(aiColor.R * 255), (byte)(aiColor.A * 255) };
}
else
{
vert.color = new byte[4];
}
if (aiMesh.HasNormals)
{
var aiNorm = aiMesh.Normals[vertId];
var normal = new Vector3(aiNorm.X, aiNorm.Y, aiNorm.Z);
vert.normal = Vector3.TransformNormal(normal, nodeMat);
}
else
{
vert.normal = new Vector3();
}
if (aiMesh.HasTextureCoords(0))
{
var aiUV1 = aiMesh.TextureCoordinateChannels[0][vertId];
vert.uv1 = new Vector2(aiUV1.X, aiUV1.Y);
}
else
{
vert.uv1 = new Vector2();
}
if (aiMesh.HasTextureCoords(1))
{
var aiUV2 = aiMesh.TextureCoordinateChannels[1][vertId];
vert.uv2 = new Vector2(aiUV2.X, aiUV2.Y);
}
else
{
vert.uv2 = new Vector2();
}
prm.vertices.Add(vert);
}
//Convert Faces
foreach (var aiFace in aiMesh.Faces)
{
prm.faces.Add(new Vector3(aiFace.Indices[0] + totalVerts, aiFace.Indices[1] + totalVerts, aiFace.Indices[2] + totalVerts));
}
//Keep count up to date for next potential loop
totalVerts = prm.vertices.Count;
}