public static Mesh CreateFromTXT(string filePath, float scale = 1.0f)
{
using(System.IO.StreamReader sr = new System.IO.StreamReader(filePath))
{
string line = sr.ReadLine();
while (!line.Contains("Data:")) line = sr.ReadLine();
var builder = new MeshBuilder();
builder.BeginSubmesh();
uint index = 0;
while(!sr.EndOfStream)
{
line = sr.ReadLine();
if(line.Length > 0)
{
var v = new MeshVertex();
var n = line.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
v.Position = new Vector3(float.Parse(n[0]), float.Parse(n[1]), float.Parse(n[2])) * scale;
v.TexCoord = new Vector2(float.Parse(n[3]), float.Parse(n[4]));
v.Normal = new Vector3(float.Parse(n[5]), float.Parse(n[6]), float.Parse(n[7]));
builder.Vertex(v);
builder.Index(index++);
}
}
builder.EndSubmesh();
return builder.Complete(true);
}
}
public static Mesh CreateQuad(float width = 20, float height = 0)
{
var hw = width / 2;
var hh = height > 0 ? height / 2 : hw;
var meshBuilder = new MeshBuilder();
meshBuilder.BeginSubmesh();
var vertices = new MeshVertex[4];
vertices[0] = new MeshVertex();
vertices[0].Position = new Vector3(-hw, -hh, 0);
vertices[0].Normal = new Vector3(0, 0, 1);
//vertices[0].Tangent = new Vector3(0, 1, 0);
vertices[0].TexCoord = new Vector2(1, 1);
vertices[1] = new MeshVertex();
vertices[1].Position = new Vector3(hw, -hh, 0);
vertices[1].Normal = new Vector3(0, 0, 1);
//vertices[1].Tangent = new Vector3(1, 0, 0);
vertices[1].TexCoord = new Vector2(0, 1);
vertices[2] = new MeshVertex();
vertices[2].Position = new Vector3(-hw, hh, 0);
vertices[2].Normal = new Vector3(0, 0, 1);
//vertices[2].Tangent = new Vector3(-1, 0, 0);
vertices[2].TexCoord = new Vector2(1, 0);
vertices[3] = new MeshVertex();
vertices[3].Position = new Vector3(hw, hh, 0);
vertices[3].Normal = new Vector3(0, 0, 1);
//vertices[3].Tangent = new Vector3(0, -1, 0);
vertices[3].TexCoord = new Vector2(0, 0);
vertices.ToList().ForEach(meshBuilder.Vertex);
meshBuilder.Index(0);
meshBuilder.Index(1);
meshBuilder.Index(2);
meshBuilder.Index(2);
meshBuilder.Index(1);
meshBuilder.Index(3);
meshBuilder.EndSubmesh();
return meshBuilder.Complete();
}
public static Mesh CreateFromFile(string filePath, bool rotateYZ = false, bool convertToLeftHanded = false, float scale = 1)
{
Func<Assimp.Vector3D, Vector3> _MakeVector3 = v => new Vector3(v.X, v.Y, v.Z);
Func<Assimp.Vector3D, Vector2> _MakeTexCoord = v =>
{
var x = v.X; while (x > 1) x -= 1; while (x < 0) x += 1;
var y = v.Y; while (y > 1) y -= 1; while (y < 0) y += 1;
return new Vector2(x, y);
};
using (var importer = new AssimpImporter())
{
if (Config.LoadMeshPrintLog)
{
LogStream logStream = new LogStream((msg, data) =>
{
Console.WriteLine(string.Format("Assimp: {0}", msg));
});
importer.AttachLogStream(logStream);
}
PostProcessSteps options = PostProcessSteps.None;
if(Config.LoadMeshComputeTangent)
options |= PostProcessSteps.CalculateTangentSpace;
if(convertToLeftHanded)
options |= PostProcessSteps.MakeLeftHanded;
var scene = importer.ImportFile(filePath, options);
if (!scene.HasMeshes) return null;
var builder = new MeshBuilder();
Matrix mat = Matrix.Identity;
if(rotateYZ)
mat = Matrix.RotationX(-MathUtil.PiOverTwo);
foreach (var aiMesh in scene.Meshes)
{
builder.BeginSubmesh();
for (int i = 0; i < aiMesh.VertexCount; ++i)
{
var v = new MeshVertex();
v.Position = _MakeVector3(aiMesh.Vertices[i]) * scale;
v.Position = Vector3.TransformCoordinate(v.Position, mat);
if (aiMesh.HasNormals)
{
v.Normal = _MakeVector3(aiMesh.Normals[i]);
v.Normal = Vector3.TransformNormal(v.Normal, mat);
}
if (aiMesh.HasTangentBasis)
{
v.Tangent = _MakeVector3(aiMesh.Tangents[i]);
v.Tangent = Vector3.TransformNormal(v.Tangent, mat);
}
if (aiMesh.HasTextureCoords(0))
{
var texCoords = aiMesh.GetTextureCoords(0);
v.TexCoord = _MakeTexCoord(texCoords[i]);
}
builder.Vertex(v);
}
//aiMesh.GetIntIndices().ToList().ForEach(builder.Index);
for (int i = 0; i < aiMesh.FaceCount; ++i)
{
var face = aiMesh.Faces[i];
for (int j = 1; j < face.IndexCount - 1;++j )
{
builder.Index((uint) face.Indices[0]);
builder.Index((uint) face.Indices[j]);
builder.Index((uint) face.Indices[j+1]);
}
}
//if (scene.HasMaterials)
//{
// var folder = System.IO.Path.GetDirectoryName(filePath);
// var materialIndex = aiMesh.MaterialIndex;
// if (materialIndex >= 0 && materialIndex < scene.Materials.Length)
// {
// var material = scene.Materials[materialIndex];
// var textures = material.GetTextures(TextureType.Diffuse);
// if (textures != null)
// {
// builder.Texture(0, System.IO.Path.Combine(folder, textures[0].FilePath));
// }
// textures = material.GetTextures(TextureType.Ambient);
// if (textures != null)
// builder.Texture(1, System.IO.Path.Combine(folder, textures[0].FilePath));
// textures = material.GetTextures(TextureType.Specular);
// if (textures != null)
// builder.Texture(2, System.IO.Path.Combine(folder, textures[0].FilePath));
// }
//}
builder.EndSubmesh();
}
return builder.Complete();
}
}
