void ImportGeometry(Collada141.geometry geometry)
{
var mesh = geometry.Item as Collada141.mesh;
if (mesh == null) return;
var float_array = mesh.source[0].Item as Collada141.float_array;
this.Coordinates = new Vector3[float_array.Values.Length / 3];
for (int i = 0; i < Coordinates.Length; i++)
{
Coordinates[i] = new Vector3(
(float)float_array.Values[i * 3 + 0],
(float)float_array.Values[i * 3 + 1],
(float)float_array.Values[i * 3 + 2]);
}
var poly_list = mesh.Items[0] as Collada141.polylist;
if (poly_list == null) return;
Triangle[] triangles = new Triangle[poly_list.count];
var raw_indices = Collada141.COLLADA.ConvertIntArray(poly_list.p);
for (int i = 0; i < triangles.Length; i++)
{
triangles[i] = new Triangle()
{
MaterialID = 0,
Vertex1 = (ushort)raw_indices[i * (3 * 2) + (0 * 2)],
Vertex2 = (ushort)raw_indices[i * (3 * 2) + (1 * 2)],
Vertex3 = (ushort)raw_indices[i * (3 * 2) + (2 * 2)],
};
}
List<ushort> triangle_indices = new List<ushort>(triangles.Length * 3);
foreach (var triangle in triangles)
{
triangle_indices.AddRange(triangle.ToArray());
}
Adjacencies adj = new Adjacencies(triangle_indices.ToArray());
this.Indices = adj.GenerateTriangleStrip();
this.Primitives = new MeshPrimitive[] { new MeshPrimitive(0, (ushort)Indices.Length) };
}
public bool ImportFromWavefront(string filename)
{
Log.Info(string.Format("Loading file {0} into memory buffer", filename));
byte[] buffer = null;
using (var file = File.OpenRead(filename))
{
buffer = new byte[file.Length];
file.Read(buffer, 0, buffer.Length);
} if (buffer == null)
{
Log.Error("Failed to create memory buffer");
return false;
}
MemoryStream stream = new MemoryStream(buffer);
StreamReader reader = new StreamReader(stream);
WavefrontOBJ.Object[] objects = new WavefrontOBJ.Object[1] { new WavefrontOBJ.Object() { faces_start_index = 0 } };
List<WavefrontOBJ.Face> faces = new List<WavefrontOBJ.Face>();
List<Vector3> vertex_coords = new List<Vector3>();
List<Vector2> texture_coords = new List<Vector2>();
List<Vector3> normals = new List<Vector3>();
Dictionary<string, int> material_names = new Dictionary<string, int>();
material_names.Add("default", 0);
int selected_material = 0;
bool default_object = true;
bool default_object_processed = false;
bool has_normals = false;
bool has_texcoords = false;
Log.Info("Begin parsing Wavefront Object data from buffer");
while (!reader.EndOfStream)
{
string line = reader.ReadLine().Trim();
if (line.StartsWith("# "))
{
Log.Info(line);
continue;
}
if (line.StartsWith("o "))
{
// if this is the first object token, use the default object
if (default_object) default_object = false;
else
{
Log.Warn(@"Support for multiple wavefront objects per mesh not implemented.
Meshes can only accept a single wavefront object. Continuing, but only using first object!");
if (!default_object_processed)
{
objects[0].faces_count = faces.Count;
default_object_processed = true;
}
}
}
else if (line.StartsWith("v "))
{
Vector3 vertex;
if (!WavefrontExtensions.TryParseVector3(out vertex, line)) return false;
vertex_coords.Add(vertex);
}
else if (line.StartsWith("vt "))
{
has_texcoords = true;
Vector2 texcoord;
if (!WavefrontExtensions.TryParseVector2(out texcoord, line)) return false;
texture_coords.Add(texcoord);
}
else if (line.StartsWith("vn "))
{
has_normals = true;
Vector3 normal;
if (!WavefrontExtensions.TryParseVector3(out normal, line)) return false;
normals.Add(normal);
}
else if (line.StartsWith("usemtl "))
{
string name = line.Replace("usemtl ", "").Trim();
if (!material_names.ContainsKey(name)) material_names.Add(name, material_names.Count);
selected_material = material_names[name];
}
else if (line.StartsWith("f "))
{
WavefrontOBJ.Face face;
if (!WavefrontOBJ.Face.TryParse(line, out face))
{
Log.Error(string.Format("Error parsing line: {0}", line));
return false;
}
else
{
face.material_id = selected_material;
faces.Add(face);
}
}
else Log.Warn(string.Format("Unsupported format found while parsing line: {0}", line));
}
if (!default_object_processed)
{
objects[0].faces_count = faces.Count;
default_object_processed = true;
}
Log.Info("Partial success... finished parsing Wavefront Object data from buffer");
List<Triangle> triangle_list = new List<Triangle>(faces.Count);
List<Vector3> vertex_coordiantes = new List<Vector3>(vertex_coords.Count);
List<Vector2> texture_coordinates = new List<Vector2>(vertex_coords.Count);
List<Vector3> vertex_normals = new List<Vector3>(vertex_coords.Count);
List<string> tokens = new List<string>();
for (int i = 0; i < faces.Count; i++)
{
Triangle triangle = new Triangle() { MaterialID = faces[i].material_id };
for (int token = 0; token < 3; ++token)
{
if (!tokens.Contains(faces[i].GetToken(token)))
{
triangle.Vertex1 = (ushort)vertex_coordiantes.Count;
tokens.Add(faces[i].GetToken(0));
vertex_coordiantes.Add(vertex_coords[faces[i].vertex_indices[token] - 1]);
texture_coordinates.Add(faces[i].has_texcoord ? texture_coords[faces[i].texcoord_indices[token] - 1] : Vector2.Zero);
vertex_normals.Add(faces[i].has_normals ? normals[faces[i].normal_indices[token] - 1] : Vector3.Zero);
}
else
{
triangle.Vertex1 = (ushort)tokens.IndexOf(faces[i].GetToken(token));
}
}
triangle_list.Add(triangle);
}
List<TriangleStrip> strips = new List<TriangleStrip>(material_names.Count);
foreach (var material in material_names)
{
var material_faces = triangle_list.Where(x => x.MaterialID == material.Value).Select(x => x.AsEnumerable<ushort>());
List<ushort> tris = new List<ushort>(material_faces.Count() * 3);
foreach (var item in material_faces)
{
tris.AddRange(item.ToArray());
}
if (tris.Count > 0)
{
Adjacencies stripper = new Adjacencies(tris.ToArray());
strips.Add(new TriangleStrip() { MaterialID = (ushort)material.Value, Indices = stripper.GenerateTriangleStrip() });
}
}
this.Coordinates = vertex_coordiantes.ToArray();
this.TextureCoordinates = texture_coordinates.ToArray();
this.Normals = vertex_normals.ToArray();
this.Primitives = new MeshPrimitive[strips.Count];
Log.Info("Parsing shader groups from triangle strips...");
TriangleStrip combined_strip = new TriangleStrip() { Indices = new ushort[0] };
ushort offset = 0;
for (int i = 0; i < strips.Count; ++i)
{
TriangleStrip.Append(ref combined_strip, strips[i]);
this.Primitives[i] = new MeshPrimitive(offset, (ushort)(combined_strip.Indices.Length - offset)) { shader_index = (ushort)i };
Log.Info(string.Format(@"ShaderGroup[ {0} ] {{ Start = {1}, Length = {2} }}", i, offset, (combined_strip.Indices.Length - offset).ToString()));
offset = (ushort)combined_strip.Indices.Length;
}
this.Indices = combined_strip.Indices;
if (!has_texcoords)
{
Log.Warn("No texture coordinates found while parsing Wavefront file..." +
"\nGenerating uv coordinates from vertex positions (flat mapping)");
this.GenerateTexCoords();
}
if (!has_normals)
{
Log.Warn("No normals found while parsing Wavefront file..." +
"\nGenerating normals...");
this.GenerateNormals();
}
Log.Info("Generating tangent space vectors...");
this.GenerateTangentSpaceVectors();
Log.Info("Success, import finished! Returning true from ImportFromWavefront();");
return true;
}
