public OBJLoader(string path)
{
List <float> vertices = new List <float>();
List <float> normals = new List <float>();
List <float> texCoord = new List <float>();
List <uint> vertIndex = new List <uint>();
List <uint> normIndex = new List <uint>();
List <uint> uvIndex = new List <uint>();
List <float> vertexData = new List <float>();
List <float> normalData = new List <float>();
List <float> uvData = new List <float>();
using (TextReader reader = File.OpenText(path)) {
string line = reader.ReadLine();
while (line != null)
{
if (string.IsNullOrEmpty(line) || line.Length < 2)
{
continue;
}
line.ToLower();
string[] content = line.Split(' ');
if (content[0] == "usemtl")
{
materialPath = content[1];
}
else if (content[0] == "v")
{
//add vertex
//vertices
vertices.Add(System.Convert.ToSingle(content[1]));
vertices.Add(System.Convert.ToSingle(content[2]));
vertices.Add(System.Convert.ToSingle(content[3]));
}
else if (content[0] == "vt")
{
// vertex texture
texCoord.Add(System.Convert.ToSingle(content[1]));
texCoord.Add(System.Convert.ToSingle(content[2]));
}
else if (content[0] == "vn")
{
//vertex normal
//normals
normals.Add(System.Convert.ToSingle(content[1]));
normals.Add(System.Convert.ToSingle(content[2]));
normals.Add(System.Convert.ToSingle(content[3]));
}
else if (content[0] == "f")
{
//face
for (int i = 1; i < content.Length; i++) //loop through values
{
string[] subsplit = content[i].Split('/'); // split based on /
if (!string.IsNullOrEmpty(subsplit[0]))
{
//vertindex
vertIndex.Add(System.Convert.ToUInt32(subsplit[0]) - 1);
}
if (!string.IsNullOrEmpty(subsplit[1]))
{
//uvindex
uvIndex.Add(System.Convert.ToUInt32(subsplit[1]) - 1);
}
if (!string.IsNullOrEmpty(subsplit[2]))
{
//normindex
normIndex.Add(System.Convert.ToUInt32(subsplit[2]) - 1);
}
}
}
else if (content[0] == "s")
{
//specular
}
line = reader.ReadLine();
}
}
for (int i = 0; i < vertIndex.Count; i++)
{
vertexData.Add(vertices[(int)vertIndex[i] * 3 + 0]);
vertexData.Add(vertices[(int)vertIndex[i] * 3 + 1]);
vertexData.Add(vertices[(int)vertIndex[i] * 3 + 2]);
}
for (int i = 0; i < normIndex.Count; i++)
{
normalData.Add(normals[(int)normIndex[i] * 3 + 0]);
normalData.Add(normals[(int)normIndex[i] * 3 + 1]);
normalData.Add(normals[(int)normIndex[i] * 3 + 2]);
}
for (int i = 0; i < uvIndex.Count; i++)
{
uvData.Add(texCoord[(int)uvIndex[i] * 2 + 0]);
uvData.Add(texCoord[(int)uvIndex[i] * 2 + 1]);
}
//create AABB container
containerAABB = new AABB(new Point(vertices[0], vertices[1], vertices[2]), new Point(vertices[0], vertices[1], vertices[2]));
for (int i = 0; i < vertexData.Count; i += 3) //vertexData.Count-2 because we pre-check ahead
{
if (vertexData[i + 0] < containerAABB.Min.X)
{
containerAABB.Min.X = vertexData[i + 0];
}
if (vertexData[i + 0] > containerAABB.Max.X)
{
containerAABB.Max.X = vertexData[i + 0];
}
if (vertexData[i + 1] < containerAABB.Min.Y)
{
containerAABB.Min.Y = vertexData[i + 1];
}
if (vertexData[i + 1] > containerAABB.Max.Y)
{
containerAABB.Max.Y = vertexData[i + 1];
}
if (vertexData[i + 2] < containerAABB.Min.Z)
{
containerAABB.Min.Z = vertexData[i + 2];
}
if (vertexData[i + 2] > containerAABB.Max.Z)
{
containerAABB.Max.Z = vertexData[i + 2];
}
}
//end
//create bvh root
bvhRoot = new BVHNode(containerAABB);
//end
//Create wireframe model and triangles
collisionMesh = new Triangle[vertexData.Count / 9];
for (int i = 0; i < vertexData.Count; i += 9)
{
Point p0, p1, p2;
p0 = new Point(vertexData[i], vertexData[i + 1], vertexData[i + 2]);
int j = i + 3;
p1 = new Point(vertexData[j], vertexData[j + 1], vertexData[j + 2]);
int k = j + 3;
p2 = new Point(vertexData[k], vertexData[k + 1], vertexData[k + 2]);
collisionMesh[i / 9] = new Triangle(p0, p1, p2);// i / 9 == increments of 1
//add triangles to bvh root
bvhRoot.Triangles.Add(collisionMesh[i / 9]);
}
//end
//BVHNode split + shake
bvhRoot.Split();
bvhRoot.Shake();
//end
//create containerSphere
float maxRadiusSq = containerAABB.Extents.LengthSquared();
float minRadiusSq = new Vector3(containerAABB.Center.X - containerAABB.Min.X, containerAABB.Center.Y - containerAABB.Min.Y, containerAABB.Center.Z - containerAABB.Min.Z).LengthSquared();
containerSphere = new Sphere(containerAABB.Center, (float)System.Math.Sqrt(System.Math.Max(maxRadiusSq, minRadiusSq)));
//end
hasNormals = normalData.Count > 0;
hasUvs = uvData.Count > 0;
numVerts = vertexData.Count;
numUvs = uvData.Count;
numNormals = normalData.Count;
List <float> data = new List <float>(); //create linear array of data
data.AddRange(vertexData); //add everything from vertData
data.AddRange(normalData); //add everything from normData
data.AddRange(uvData); //add everything from uvData
vertexBuffer = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, vertexBuffer); //bind array
GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(data.Count * sizeof(float)), data.ToArray(), BufferUsageHint.StaticDraw); //transfer array to gpu
GL.BindBuffer(BufferTarget.ArrayBuffer, 0); //release array
}
