private static Mesh FromAssimp(Module.Import.Assimp.Context context, aiMesh mesh_data)
{
// Create new mesh
Mesh mesh = new Mesh();
// Assimp does not support submeshes
mesh.submeshes = new SubMesh[1];
mesh.submeshes[0] = new SubMesh();
// Get material associated to this mesh
mesh.assimpMaterial = (int)mesh_data.mMaterialIndex;
// Get mesh name
using (aiString mesh_name = mesh_data.mName)
{
mesh.name = Assimp.Convert.Name(mesh_name, "mesh");
}
// Get vertices
if (mesh_data.HasPositions())
{
using (aiVector3DArray vertices = mesh_data.Vertices)
{
mesh.vertices = Assimp.Convert.AssimpToUnity.Array <aiVector3D, Vector3>(Assimp.Convert.AssimpToUnity.Vector3, vertices);
}
}
// Get normals
if (mesh_data.HasNormals())
{
using (aiVector3DArray normals = mesh_data.Normals)
{
mesh.normals = Assimp.Convert.AssimpToUnity.Array <aiVector3D, Vector3>(Assimp.Convert.AssimpToUnity.Vector3, normals);
}
}
// Get tangents
if (mesh_data.HasTangentsAndBitangents())
{
using (aiVector3DArray tangents = mesh_data.Tangents)
{
mesh.tangents = Assimp.Convert.AssimpToUnity.Array <aiVector3D, Vector4>(Assimp.Convert.AssimpToUnity.Tangent, tangents);
}
}
// Get faces
if (mesh_data.HasFaces())
{
using (aiFaceArray faces = mesh_data.Faces)
{
mesh.submeshes[0].triangles = Assimp.Convert.AssimpToUnity.Face(faces, out mesh.submeshes[0].topology);
}
}
// Get UV coords
if (mesh_data.GetNumUVChannels() > 0 && mesh_data.HasTextureCoords(0))
{
using (aiVector3DMultiArray texture_coords = mesh_data.TextureCoords)
{
using (aiVector3DArray texture_coords0 = texture_coords.Get(0))
{
mesh.uv1 = Assimp.Convert.AssimpToUnity.Array <aiVector3D, Vector2>(Assimp.Convert.AssimpToUnity.UV, texture_coords0);
}
if (mesh_data.GetNumUVChannels() > 1 && mesh_data.HasTextureCoords(1))
{
using (aiVector3DArray texture_coords1 = texture_coords.Get(1))
{
mesh.uv2 = Assimp.Convert.AssimpToUnity.Array <aiVector3D, Vector2>(Assimp.Convert.AssimpToUnity.UV, texture_coords1);
}
}
}
}
else
{
// No texture UVs. We need to generate some to avoid problems with most default unity shaders
int size = mesh.vertices.Length;
mesh.uv1 = new Vector2[size];
}
// Get vertex colors
if (mesh_data.GetNumColorChannels() > 0 && mesh_data.HasVertexColors(0))
{
using (aiColor4DMultiArray colors = mesh_data.Colors)
{
using (aiColor4DArray colors0 = colors.Get(0))
{
mesh.colors = Assimp.Convert.AssimpToUnity.Array <aiColor4D, Color>(Assimp.Convert.AssimpToUnity.Color, colors0);
}
}
}
// TODO: anims + bones
// We must dispose of the given parameter to free unused memory
mesh_data.Dispose();
context.progress.Update(ASSIMP_PROGRESS_FACTOR);
return(mesh);
}
private MeshContent ExtractMesh(aiMesh aiMesh)
{
if (!String.IsNullOrEmpty(aiMesh.mName.Data))
{
log("modelname " + aiMesh.mName.Data);
meshBuilder = MeshBuilder.StartMesh(aiMesh.mName.Data);
}
else
{
meshBuilder = MeshBuilder.StartMesh(Path.GetFileNameWithoutExtension(filename));
}
if (!aiMesh.HasPositions())
{
throw new Exception("MOdel does not have Position");
}
// Add additional vertex channels for texture coordinates and normals
if (aiMesh.HasTextureCoords(0))
{
textureCoordinateDataIndex = meshBuilder.CreateVertexChannel <Vector2>(VertexChannelNames.TextureCoordinate(0));
}
else if (aiMesh.HasVertexColors(0))
{
colorCoordinateDataIndex = meshBuilder.CreateVertexChannel <Vector4>(VertexChannelNames.Color(0));
}
if (aiMesh.HasNormals())
{
normalDataIndex = meshBuilder.CreateVertexChannel <Vector3>(VertexChannelNames.Normal());
}
if (aiMesh.HasTangentsAndBitangents())
{
tangentDataIndex = meshBuilder.CreateVertexChannel <Vector3>(VertexChannelNames.Tangent(0));
binormalDataIndex = meshBuilder.CreateVertexChannel <Vector3>(VertexChannelNames.Binormal(0));
}
if (aiMesh.HasBones())
{
boneDataIndex = meshBuilder.CreateVertexChannel <BoneWeightCollection>(VertexChannelNames.Weights(0));
}
var numFaces = (int)aiMesh.mNumFaces;
var numVertices = (int)aiMesh.mNumVertices;
var aiPositions = aiMesh.mVertices;
var aiNormals = aiMesh.mNormals;
var aiTextureCoordsAll = aiMesh.mTextureCoords;
var aiTextureCoords = (aiTextureCoordsAll != null) ? aiTextureCoordsAll[0] : null;
for (int j = 0; j < aiMesh.mNumVertices; j++)
{
meshBuilder.CreatePosition(aiMesh.mVertices[j].x, aiMesh.mVertices[j].y, aiMesh.mVertices[j].z);
}
meshBuilder.SetMaterial(GetMaterial(aiMesh));
var aiFaces = aiMesh.mFaces;
var dxIndices = new uint[numFaces * 3];
for (int k = 0; k < numFaces; ++k)
{
var aiFace = aiFaces[k];
var aiIndices = aiFace.mIndices;
for (int j = 0; j < 3; ++j)
{
int index = (int)aiIndices[j];
if (aiMesh.HasTextureCoords(0))
{
meshBuilder.SetVertexChannelData(textureCoordinateDataIndex, new Vector2(aiMesh.mTextureCoords[0][index].x, aiMesh.mTextureCoords[0][index].y));
}
else if (aiMesh.HasVertexColors(0))
{
meshBuilder.SetVertexChannelData(colorCoordinateDataIndex, new Vector4(aiMesh.mColors[0][index].r, aiMesh.mColors[0][index].g, aiMesh.mColors[0][index].b, aiMesh.mColors[0][index].a));
}
if (aiMesh.HasNormals())
{
meshBuilder.SetVertexChannelData(normalDataIndex, new Vector3(aiMesh.mNormals[index].x, aiMesh.mNormals[index].y, aiMesh.mNormals[index].z));
}
if (aiMesh.HasTangentsAndBitangents())
{
meshBuilder.SetVertexChannelData(tangentDataIndex, new Vector3(aiMesh.mTangents[index].x, aiMesh.mTangents[index].y, aiMesh.mTangents[index].z));
meshBuilder.SetVertexChannelData(binormalDataIndex, new Vector3(aiMesh.mBitangents[index].x, aiMesh.mBitangents[index].y, aiMesh.mBitangents[index].z));
}
if (aiMesh.HasBones())
{
BoneWeightCollection BoneWeightCollection = new BoneWeightCollection();
if (wbone.ContainsKey(index))
{
foreach (var item in wbone[index])
{
BoneWeightCollection.Add(new BoneWeight(item.Key, item.Value));
}
}
meshBuilder.SetVertexChannelData(boneDataIndex, BoneWeightCollection);
}
meshBuilder.AddTriangleVertex(index);
}
}
MeshContent meshContent = meshBuilder.FinishMesh();
return(meshContent);
}
