public static Assimp.Scene GetResourceModel(string resourceName, string format)
{
if (AssimpContext == null)
{
AssimpContext = new Assimp.AssimpContext();
}
var stream = GetResourceStream(resourceName);
return(AssimpContext.ImportFileFromStream(stream, format));
}
public static UnityEngine.Mesh ToUnityMesh(File file)
{
if (file.FileType != File.Type.Model)
{
return(null);
}
Assimp.AssimpContext ctx = new Assimp.AssimpContext();
Assimp.Scene s = ctx.ImportFileFromStream(file.StreamData, Assimp.PostProcessSteps.Triangulate);
if (!s.HasMeshes)
{
return(null);
}
var mesh = s.Meshes[0];
var newMesh = new UnityEngine.Mesh();
newMesh.vertices = mesh.Vertices.ConvertAll(v => v.ToV3()).ToArray();
//int[] indicies = mesh.GetIndices();
List <int> indicies = new List <int>();
foreach (var face in mesh.Faces)
{
indicies.AddRange(face.Indices);
}
newMesh.triangles = indicies.ToArray();
for (int i = 0; i < mesh.TextureCoordinateChannelCount; ++i)
{
newMesh.SetUVs(i, mesh.TextureCoordinateChannels[i].ConvertAll(v => v.ToV2()));
}
return(newMesh);
}
public static bool Import(string file, List <Geometry> geoList, List <BoundingBox> bboxList,
VertexComponent[] vertexComponents = null, bool combineVB = false, bool combineIB = false)
{
Assimp.PostProcessSteps assimpFlags =
Assimp.PostProcessSteps.FlipWindingOrder |
Assimp.PostProcessSteps.CalculateTangentSpace |
Assimp.PostProcessSteps.Triangulate |
Assimp.PostProcessSteps.SortByPrimitiveType |
Assimp.PostProcessSteps.PreTransformVertices |
//Assimp.PostProcessSteps.GenerateNormals |
Assimp.PostProcessSteps.GenerateSmoothNormals |
Assimp.PostProcessSteps.GenerateUVCoords |
Assimp.PostProcessSteps.OptimizeMeshes |
Assimp.PostProcessSteps.Debone |
Assimp.PostProcessSteps.ValidateDataStructure;
var ctx = new Assimp.AssimpContext();
string ext = FileUtil.GetExtension(file);
if (!ctx.IsImportFormatSupported(ext))
{
ctx.Dispose();
return(false);
}
File stream = FileSystem.Instance.GetFile(file);
Assimp.Scene scene = ctx.ImportFileFromStream(stream, assimpFlags);
float scale = 1.0f;
string path = FileUtil.GetPath(file);
vertexBuffer.Clear();
indexBuffer.Clear();
vertexOffset = 0;
indexOffset = 0;
if (vertexComponents == null)
{
vertexComponents = defaultVertexComponents;
}
VertexLayout vertexLayout = new VertexLayout(vertexComponents);
// Iterate through all meshes in the file and extract the vertex components
for (int m = 0; m < scene.MeshCount; m++)
{
Assimp.Mesh mesh = scene.Meshes[m];
var geometry = ConvertGeometry(mesh, scale, vertexLayout, vertexComponents, combineVB, combineIB, out var meshBoundingBox);
geoList.Add(geometry);
bboxList.Add(meshBoundingBox);
}
if (combineVB)
{
var vb = Buffer.Create(VkBufferUsageFlags.VertexBuffer, false, sizeof(float), vertexBuffer.Count, vertexBuffer.Data);
foreach (var geo in geoList)
{
geo.VertexBuffer = vb;
}
}
if (combineIB)
{
var ib = Buffer.Create(VkBufferUsageFlags.IndexBuffer, false, sizeof(uint), indexBuffer.Count, indexBuffer.Data);
foreach (var geo in geoList)
{
geo.IndexBuffer = ib;
}
}
ctx.Dispose();
return(true);
}
