public static void ToAssimp(Module.Export.Assimp.Context context, Scene scene)
{
if (context.meshes != null && context.meshes.Count > 0)
{
using (aiMeshArray meshes = context.scene.Meshes)
{
uint count = (uint)context.meshes.Count;
meshes.Reserve(count, true);
foreach (KeyValuePair <Module.Export.Assimp.Mesh, uint> indexes in context.meshes)
{
if (indexes.Value >= 0 && indexes.Value < count)
{
// Save the values to local variables to avoid the problem of variables passed by reference to lambda functions.
Module.Export.Assimp.Mesh mesh_indexes = indexes.Key;
aiMesh assimp_mesh = new aiMesh(); // Allocation in another thread fails so we must do it before starting the task
meshes.Set(indexes.Value, assimp_mesh.Unmanaged());
context.threads.AddTask(() => ToAssimp(context, scene, mesh_indexes, assimp_mesh));
}
}
}
}
}
public aiNode ToAssimp(Module.Export.Assimp.Context context, Scene scene, aiNode parent)
{
uint index = 0;
aiNode node_object = new aiNode(name);
// Set parent
node_object.mParent = parent;
// Set transform
using (aiVector3D assimp_scale = Assimp.Convert.UnityToAssimp.Vector3(scale))
{
using (aiQuaternion assimp_rotation = Assimp.Convert.UnityToAssimp.Quaternion(rotation))
{
using (aiVector3D assimp_position = Assimp.Convert.UnityToAssimp.Vector3(position))
{
using (aiMatrix4x4 matrix = new aiMatrix4x4(assimp_scale, assimp_rotation, assimp_position))
{
node_object.mTransformation = matrix.Unmanaged();
}
}
}
}
// Parse the children nodes
if (children != null && children.Length > 0)
{
using (aiNodeArray assimp_children = node_object.Children)
{
assimp_children.Reserve((uint)children.Length, true);
index = 0;
foreach (Node child in children)
{
using (aiNode assimp_child = child.ToAssimp(context, scene, node_object))
{
if (assimp_child != null)
{
assimp_children.Set(index++, assimp_child.Unmanaged());
}
}
}
}
}
// Parse the mesh objects
if (meshes != null && meshes.Length > 0)
{
using (aiUIntArray assimp_meshes = node_object.Meshes)
{
assimp_meshes.Reserve((uint)meshes.Length, true);
index = 0;
foreach (GraphicMesh graphic_mesh in meshes)
{
Mesh mesh = scene.meshes[graphic_mesh.meshIndex];
int nb_materials = (graphic_mesh.materialsIndexes != null ? graphic_mesh.materialsIndexes.Length : 0);
// Handle unity submeshes by creating new meshes for each submesh
for (int i = 0; i < mesh.SubMeshesCount; i++)
{
// Assimp meshes can only have one material. Therefore, mutliple instances of one mesh
// using different materials must be detected and replaced by different output meshes.
uint assimp_mesh_index;
int mat_index = (i < nb_materials ? graphic_mesh.materialsIndexes[i] : 0 /*Assimp default*/);
Module.Export.Assimp.Mesh key = new Module.Export.Assimp.Mesh(graphic_mesh.meshIndex, i, mat_index);
if (!context.meshes.TryGetValue(key, out assimp_mesh_index))
{
assimp_mesh_index = (uint)context.meshes.Count;
context.meshes.Add(key, assimp_mesh_index);
}
assimp_meshes.Set(index++, assimp_mesh_index);
}
}
}
}
// Parse the node metadata
if (components != null)
{
foreach (UnityComponent component in components)
{
aiMetadata assimp_meta = component.ToAssimpMetadata();
if (assimp_meta != null)
{
node_object.mMetaData = assimp_meta.Unmanaged();
break;
}
}
}
context.progress.Update(ASSIMP_PROGRESS_FACTOR);
return(node_object);
}
private static void ToAssimp(Module.Export.Assimp.Context context, Scene scene, Module.Export.Assimp.Mesh mesh_indexes, aiMesh assimp_mesh)
{
Mesh mesh = scene.meshes[mesh_indexes.mesh];
assimp_mesh.mMaterialIndex = (uint)mesh_indexes.material;
using (aiString assimp_mesh_name = new aiString(mesh.name))
{
assimp_mesh.mName = assimp_mesh_name.Unmanaged();
}
if (mesh.vertices.Length > 0)
{
using (aiVector3DArray vertices = assimp_mesh.Vertices)
{
Assimp.Convert.UnityToAssimp.Array(Assimp.Convert.UnityToAssimp.Vector3, mesh.vertices, vertices);
}
}
if (mesh.normals.Length > 0)
{
using (aiVector3DArray normals = assimp_mesh.Normals)
{
Assimp.Convert.UnityToAssimp.Array(Assimp.Convert.UnityToAssimp.Vector3, mesh.normals, normals);
}
}
if (mesh.tangents.Length > 0)
{
using (aiVector3DArray tangents = assimp_mesh.Tangents)
{
Assimp.Convert.UnityToAssimp.Array(Assimp.Convert.UnityToAssimp.Tangent, mesh.tangents, tangents);
}
}
if (mesh_indexes.submesh < mesh.submeshes.Length)
{
// Support for submeshes: this mesh represent only one submesh of the original mesh
SubMesh sub_mesh = mesh.submeshes[mesh_indexes.submesh];
if (sub_mesh != null && sub_mesh.triangles != null && sub_mesh.triangles.Length > 0)
{
using (aiFaceArray faces = assimp_mesh.Faces)
{
Assimp.Convert.UnityToAssimp.Face(sub_mesh.triangles, sub_mesh.topology, faces);
}
}
}
if (mesh.uv1.Length > 0 || mesh.uv2.Length > 0)
{
using (aiVector3DMultiArray texture_coords = assimp_mesh.TextureCoords)
{
if (mesh.uv1.Length > 0)
{
using (aiVector3DArray texture_coords0 = texture_coords.Get(0))
{
Assimp.Convert.UnityToAssimp.Array(Assimp.Convert.UnityToAssimp.UV, mesh.uv1, texture_coords0);
}
}
if (mesh.uv2.Length > 0)
{
using (aiVector3DArray texture_coords1 = texture_coords.Get(1))
{
Assimp.Convert.UnityToAssimp.Array(Assimp.Convert.UnityToAssimp.UV, mesh.uv2, texture_coords1);
}
}
}
}
if (mesh.colors.Length > 0)
{
using (aiColor4DMultiArray colors = assimp_mesh.Colors)
{
using (aiColor4DArray colors0 = colors.Get(0))
{
Assimp.Convert.UnityToAssimp.Array(Assimp.Convert.UnityToAssimp.Color, mesh.colors, colors0);
}
}
}
context.progress.Update(ASSIMP_PROGRESS_FACTOR);
}
