private ModelData.MeshPart Process(ModelData.Mesh mesh, Assimp.Mesh assimpMesh)
{
var meshPart = new ModelData.MeshPart()
{
MaterialIndex = assimpMesh.MaterialIndex,
VertexBufferRange = new ModelData.BufferRange() { Slot = mesh.VertexBuffers.Count },
IndexBufferRange = new ModelData.BufferRange() { Slot = mesh.IndexBuffers.Count }
};
var vertexBuffer = new ModelData.VertexBuffer()
{
Layout = new List<VertexElement>()
};
mesh.VertexBuffers.Add(vertexBuffer);
var indexBuffer = new ModelData.IndexBuffer();
mesh.IndexBuffers.Add(indexBuffer);
var layout = vertexBuffer.Layout;
int vertexBufferElementSize = 0;
// Add position
layout.Add(VertexElement.PositionTransformed(Format.R32G32B32_Float, 0));
vertexBufferElementSize += Utilities.SizeOf<SharpDX.Vector3>();
// Add normals
if (assimpMesh.HasNormals)
{
layout.Add(VertexElement.Normal(0, Format.R32G32B32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf<SharpDX.Vector3>();
}
// Add colors
if (assimpMesh.VertexColorChannelCount > 0)
{
for (int localIndex = 0, i = 0; i < assimpMesh.VertexColorChannelCount; i++)
{
if (assimpMesh.HasVertexColors(i))
{
layout.Add(VertexElement.Color(localIndex, Format.R32G32B32A32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf<SharpDX.Color4>();
localIndex++;
}
}
}
// Add textures
if (assimpMesh.TextureCoordsChannelCount > 0)
{
for (int localIndex = 0, i = 0; i < assimpMesh.TextureCoordsChannelCount; i++)
{
if (assimpMesh.HasTextureCoords(i))
{
var uvCount = assimpMesh.GetUVComponentCount(i);
if (uvCount == 2)
{
layout.Add(VertexElement.TextureCoordinate(localIndex, Format.R32G32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf<SharpDX.Vector2>();
}
else if (uvCount == 3)
{
layout.Add(VertexElement.TextureCoordinate(localIndex, Format.R32G32B32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf<SharpDX.Vector3>();
}
else
{
throw new InvalidOperationException("Unexpected uv count");
}
localIndex++;
}
}
}
// Add tangent / bitangent
if (assimpMesh.HasTangentBasis)
{
layout.Add(VertexElement.Tangent(Format.R32G32B32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf<SharpDX.Vector3>();
layout.Add(VertexElement.BiTangent(Format.R32G32B32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf<SharpDX.Vector3>();
}
// Extract Skinning Indices / Weights
bool hasWeights = false;
var skinningCount = new int[assimpMesh.VertexCount];
var skinningIndices = new Int4[assimpMesh.VertexCount];
var skinningWeights = new Vector4[assimpMesh.VertexCount];
if (assimpMesh.HasBones)
{
meshPart.BoneOffsetMatrices = new Matrix[assimpMesh.BoneCount];
for (int i = 0; i < assimpMesh.Bones.Length; i++)
{
var bone = assimpMesh.Bones[i];
meshPart.BoneOffsetMatrices[i] = ConvertMatrix(bone.OffsetMatrix);
if (bone.HasVertexWeights)
{
var boneNode = scene.RootNode.FindNode(bone.Name);
var boneIndex = skinnedBones[boneNode];
for (int j = 0; j < bone.VertexWeightCount; j++)
{
var weights = bone.VertexWeights[j];
var vertexSkinningCount = skinningCount[weights.VertexID];
skinningIndices[weights.VertexID][vertexSkinningCount] = boneIndex;
skinningWeights[weights.VertexID][vertexSkinningCount] = weights.Weight;
skinningCount[weights.VertexID] = ++vertexSkinningCount;
}
hasWeights = true;
}
}
if (hasWeights)
{
layout.Add(VertexElement.BlendIndices(Format.R16G16B16A16_SInt, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf<SharpDX.Int4>();
layout.Add(VertexElement.BlendWeights(Format.R32G32B32A32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf<SharpDX.Vector4>();
}
}
// Write all vertices
meshPart.VertexBufferRange.Count = assimpMesh.VertexCount;
vertexBuffer.Count = assimpMesh.VertexCount;
vertexBuffer.Buffer = new byte[vertexBufferElementSize * assimpMesh.VertexCount];
// Update the MaximumBufferSizeInBytes needed to load this model
if (vertexBuffer.Buffer.Length > model.MaximumBufferSizeInBytes)
{
model.MaximumBufferSizeInBytes = vertexBuffer.Buffer.Length;
}
var vertexStream = DataStream.Create(vertexBuffer.Buffer, true, true);
for (int i = 0; i < assimpMesh.VertexCount; i++)
{
var position = assimpMesh.Vertices[i];
vertexStream.Write(position);
// Store bounding points for BoundingSphere pre-calculation
boundingPoints[currentBoundingPointIndex++] = new Vector3(position.X, position.Y, position.Z);
// Add normals
if (assimpMesh.HasNormals)
{
vertexStream.Write(assimpMesh.Normals[i]);
}
// Add colors
if (assimpMesh.VertexColorChannelCount > 0)
{
for (int j = 0; j < assimpMesh.VertexColorChannelCount; j++)
{
if (assimpMesh.HasVertexColors(j))
{
vertexStream.Write(assimpMesh.GetVertexColors(j)[i]);
}
}
}
// Add textures
if (assimpMesh.TextureCoordsChannelCount > 0)
{
for (int j = 0; j < assimpMesh.TextureCoordsChannelCount; j++)
{
if (assimpMesh.HasTextureCoords(j))
{
var uvCount = assimpMesh.GetUVComponentCount(j);
var uv = assimpMesh.GetTextureCoords(j)[i];
if (uvCount == 2)
{
vertexStream.Write(new Vector2(uv.X, uv.Y));
}
else
{
vertexStream.Write(uv);
}
}
}
}
// Add tangent / bitangent
if (assimpMesh.HasTangentBasis)
{
vertexStream.Write(assimpMesh.Tangents[i]);
vertexStream.Write(assimpMesh.BiTangents[i]);
}
// Add Skinning Indices/Weights
if (assimpMesh.HasBones && hasWeights)
{
vertexStream.Write(skinningIndices[i]);
vertexStream.Write(skinningWeights[i]);
}
}
vertexStream.Dispose();
// Write all indices
var indices = assimpMesh.GetIntIndices();
indexBuffer.Count = indices.Length;
meshPart.IndexBufferRange.Count = indices.Length;
if (meshPart.VertexBufferRange.Count < 65536)
{
// Write only short indices if count is less than the size of a short
indexBuffer.Buffer = new byte[indices.Length * 2];
using (var indexStream = DataStream.Create(indexBuffer.Buffer, true, true))
foreach (int index in indices) indexStream.Write((ushort)index);
}
else
{
// Otherwise, use full 32-bit precision to store indices
indexBuffer.Buffer = new byte[indices.Length * 4];
using (var indexStream = DataStream.Create(indexBuffer.Buffer, true, true))
indexStream.WriteRange(indices);
}
// Update the MaximumBufferSizeInBytes needed to load this model
if (indexBuffer.Buffer.Length > model.MaximumBufferSizeInBytes)
{
model.MaximumBufferSizeInBytes = indexBuffer.Buffer.Length;
}
return meshPart;
}
private ContentCompilerResult CompileFromFileInternal(string fileName, ModelCompilerOptions compilerOptions)
{
logger = new Logger();
var result = new ContentCompilerResult() { Logger = logger };
modelFilePath = fileName;
modelDirectory = Path.GetDirectoryName(modelFilePath);
// Preload AssimpLibrary if not already loaded
if (!AssimpLibrary.Instance.LibraryLoaded)
{
var rootPath = Path.GetDirectoryName(typeof(AssimpLibrary).Assembly.Location);
AssimpLibrary.Instance.LoadLibrary(Path.Combine(rootPath, AssimpLibrary.Instance.DefaultLibraryPath32Bit), Path.Combine(rootPath, AssimpLibrary.Instance.DefaultLibraryPath64Bit));
}
var importer = new AssimpImporter();
//importer.SetConfig(new NormalSmoothingAngleConfig(66.0f));
// Steps for Direct3D, should we make this configurable?
var steps = PostProcessSteps.FlipUVs | PostProcessSteps.FlipWindingOrder | PostProcessSteps.MakeLeftHanded;
// Setup quality
switch (compilerOptions.Quality)
{
case ModelRealTimeQuality.Low:
steps |= PostProcessPreset.TargetRealTimeFast;
break;
case ModelRealTimeQuality.Maximum:
steps |= PostProcessPreset.TargetRealTimeMaximumQuality;
break;
default:
steps |= PostProcessPreset.TargetRealTimeQuality;
break;
}
scene = importer.ImportFile(fileName, steps);
model = new ModelData();
ProcessScene();
result.IsContentGenerated = true;
result.ModelData = model;
return result;
}
private void CollectNodes(Node node, ModelData.Bone targetParent)
{
bool isModelNode = IsModelNode(node);
if (!isModelNode)
{
return;
}
var parent = new ModelData.Bone
{
Index = model.Bones.Count,
Name = node.Name,
ParentIndex = targetParent == null ? -1 : targetParent.Index,
Transform = ConvertMatrix(node.Transform),
Children = new List<int>()
};
if (targetParent!= null && targetParent.Children != null)
{
targetParent.Children.Add(parent.Index);
}
// Associate created bones with local index
meshNodes[node] = model.Bones.Count;
model.Bones.Add(parent);
// if node has meshes, create a new scene object for it
if( node.MeshCount > 0)
{
var mesh = new ModelData.Mesh
{
Name = parent.Name,
ParentBoneIndex = parent.Index,
MeshParts = new List<ModelData.MeshPart>()
};
model.Meshes.Add(mesh);
// Precalculate the number of vertices for bounding sphere calculation
boundingPointCount = 0;
for (int i = 0; i < node.MeshCount; i++)
{
var meshIndex = node.MeshIndices[i];
var meshPart = scene.Meshes[meshIndex];
boundingPointCount += meshPart.VertexCount;
}
// Reallocate the buffer if needed
if (boundingPoints == null || boundingPoints.Length < boundingPointCount)
{
boundingPoints = new Vector3[boundingPointCount];
}
currentBoundingPointIndex = 0;
for (int i = 0; i < node.MeshCount; i++)
{
var meshIndex = node.MeshIndices[i];
var meshPart = Process(mesh, scene.Meshes[meshIndex]);
var meshToPartList = registeredMeshParts[meshIndex];
if (meshToPartList == null)
{
meshToPartList = new List<ModelData.MeshPart>();
registeredMeshParts[meshIndex] = meshToPartList;
}
meshToPartList.Add(meshPart);
mesh.MeshParts.Add(meshPart);
}
// Calculate the bounding sphere.
BoundingSphere.FromPoints(boundingPoints, 0, boundingPointCount, out mesh.BoundingSphere);
}
// continue for all child nodes
if (node.HasChildren)
{
foreach (var subNode in node.Children)
{
CollectNodes(subNode, parent);
}
}
}
private void CollectNodes(Node node, ModelData.Bone targetParent)
{
bool isModelNode = IsModelNode(node);
if (!isModelNode)
{
return;
}
var parent = new ModelData.Bone
{
Index = model.Bones.Count,
Name = node.Name,
ParentIndex = targetParent == null ? -1 : targetParent.Index,
Transform = ConvertMatrix(node.Transform),
Children = new List<int>()
};
if (targetParent != null && targetParent.Children != null)
{
targetParent.Children.Add(parent.Index);
}
// Associate created bones with local index
skeletonNodes[node] = model.Bones.Count;
model.Bones.Add(parent);
// continue for all child nodes
if (node.HasChildren)
{
foreach (var subNode in node.Children)
{
CollectNodes(subNode, parent);
}
}
}