public Mesh(ObjLoader.Loader.Loaders.LoadResult result, Vector3 position, Vector3 rotation, float rotationAngle, Vector3 scale, float[] color)
{
// TODO: Complete member initialization
this.result = result;
this.position = position;
this.rotation = rotation;
this.rotationAngle = rotationAngle;
this.scale = scale;
this.color = color;
}
public void LoadObject(string filename)
{
try
{
// This OBJ parser library is developed by chrisjansson and available at https://github.com/chrisjansson/ObjLoader
ObjLoader.Loader.Loaders.LoadResult obj = LoadOBJObject(filename);
// This code assumes that all faces in all groups are defined as triangles or quads
foreach (var group in obj.Groups)
{
Group newGroup = new Group();
if (group.Material.DiffuseTextureMap != null)
{
newGroup.texture = ResourceManager.LoadTexture(group.Material.DiffuseTextureMap);
if (group.Material.BumpMap != null)
{
newGroup.bumpTexture = ResourceManager.LoadTexture(group.Material.BumpMap);
}
if (group.Material.DisplacementMap != null)
{
newGroup.displacementTexture = ResourceManager.LoadTexture(group.Material.DisplacementMap);
}
}
else
{
newGroup.texture = 0;
}
bool error = false;
string errorMessage = "";
bool primitiveSet = false;
foreach (var face in group.Faces)
{
++newGroup.numberOfFaces;
if (face.Count == 3)
{
if (primitiveSet && newGroup.primitiveScale != 3)
{
error = true;
errorMessage = "The " + filename + " file has both triangular and quad faces and so will not be rendered correctly";
}
newGroup.primitiveType = PrimitiveType.Triangles;
newGroup.primitiveScale = 3;
primitiveSet = true;
}
else if (face.Count == 4)
{
if (primitiveSet && newGroup.primitiveScale != 4)
{
error = true;
errorMessage = "The " + filename + " file has both triangular and quad faces and so will not be rendered correctly";
}
newGroup.primitiveType = PrimitiveType.Quads;
newGroup.primitiveScale = 4;
primitiveSet = true;
}
else
{
error = true;
errorMessage = "The " + filename + " file does not have triangular or quad faces and so will not be rendered correctly";
}
for (int i = 0; i < face.Count; ++i)
{
// obj indexing starts at 1, so we need to subtract 1
int v = face[i].VertexIndex - 1;
newGroup.vertices.Add(obj.Vertices[v].X);
newGroup.vertices.Add(obj.Vertices[v].Y);
newGroup.vertices.Add(obj.Vertices[v].Z);
if (obj.Textures.Count > 0)
{
// obj indexing starts at 1, so we need to subtract 1
int t = face[i].TextureIndex - 1;
newGroup.textureCoords.Add(obj.Textures[t].X);
// OpenGL tex coords start at top-left
newGroup.textureCoords.Add(1.0f - obj.Textures[t].Y);
}
if (obj.Normals.Count > 0)
{
// obj indexing starts at 1, so we need to subtract 1
int n = face[i].NormalIndex - 1;
newGroup.normals.Add(obj.Normals[n].X);
newGroup.normals.Add(obj.Normals[n].Y);
newGroup.normals.Add(obj.Normals[n].Z);
}
//for creating tangent/binormal
if (newGroup.textureCoords.Count > 0)
{
int vIndex1 = face[0].VertexIndex - 1;
int vIndex2 = face[1].VertexIndex - 1;
int vIndex3 = face[2].VertexIndex - 1;
Vector3 face1 = new Vector3(obj.Vertices[vIndex1].X, obj.Vertices[vIndex1].Y, obj.Vertices[vIndex1].Z);
Vector3 face2 = new Vector3(obj.Vertices[vIndex2].X, obj.Vertices[vIndex2].Y, obj.Vertices[vIndex2].Z);
Vector3 face3 = new Vector3(obj.Vertices[vIndex3].X, obj.Vertices[vIndex3].Y, obj.Vertices[vIndex3].Z);
Vector3 p21 = Vector3.Subtract(face2, face1);
Vector3 p31 = Vector3.Subtract(face3, face1);
int tIndex1 = face[0].TextureIndex - 1;
int tIndex2 = face[1].TextureIndex - 1;
int tIndex3 = face[2].TextureIndex - 1;
Vector2 tex1 = new Vector2(obj.Textures[tIndex1].X, obj.Textures[tIndex1].Y);
Vector2 tex2 = new Vector2(obj.Textures[tIndex2].X, obj.Textures[tIndex2].Y);
Vector2 tex3 = new Vector2(obj.Textures[tIndex3].X, obj.Textures[tIndex3].Y);
Vector2 uv21 = Vector2.Subtract(tex2, tex1);
Vector2 uv31 = Vector2.Subtract(tex3, tex1);
Vector3 calculatedTangent = Vector3.Subtract(Vector3.Multiply(p21, uv31.Y), Vector3.Multiply(p31, uv21.Y));
calculatedTangent.Normalize();
newGroup.tangents.Add(calculatedTangent.X);
newGroup.tangents.Add(calculatedTangent.Y);
newGroup.tangents.Add(calculatedTangent.Z);
Vector3 calculatedBinormal = Vector3.Subtract(Vector3.Multiply(p31, uv21.X), Vector3.Multiply(p21, uv31.X));
calculatedBinormal.Normalize();
newGroup.binormals.Add(calculatedBinormal.X);
newGroup.binormals.Add(calculatedBinormal.Y);
newGroup.binormals.Add(calculatedBinormal.Z);
//GL.BindAttribLocation(newGroup.vao_Handle, 12, "tangent");
//GL.BindAttribLocation(newGroup.vao_Handle, 13, "binormal");
}
}
}
if (error)
{
MessageBox.Show(errorMessage, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
// Create the single VAO that will hold all information for this group
GL.GenVertexArrays(1, out newGroup.vao_Handle);
GL.BindVertexArray(newGroup.vao_Handle);
// Create the buffer for the vertices
GL.GenBuffers(1, out newGroup.vbo_verts);
GL.BindBuffer(BufferTarget.ArrayBuffer, newGroup.vbo_verts);
GL.BufferData <float>(BufferTarget.ArrayBuffer, (IntPtr)(newGroup.vertices.Count * 4), newGroup.vertices.ToArray <float>(), BufferUsageHint.StaticDraw);
GL.EnableVertexAttribArray(0);
GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 3 * 4, 0);
// Tex Coords
if (obj.Textures.Count > 0)
{
// Create the buffer for the texture coords
GL.GenBuffers(1, out newGroup.vbo_texs);
GL.BindBuffer(BufferTarget.ArrayBuffer, newGroup.vbo_texs);
GL.BufferData <float>(BufferTarget.ArrayBuffer, (IntPtr)(newGroup.textureCoords.Count * 4), newGroup.textureCoords.ToArray <float>(), BufferUsageHint.StaticDraw);
GL.EnableVertexAttribArray(1);
GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, 2 * 4, 0);
}
// Normals
if (obj.Normals.Count > 0)
{
// Create the buffer for the normals
GL.GenBuffers(1, out newGroup.vbo_normals);
GL.BindBuffer(BufferTarget.ArrayBuffer, newGroup.vbo_normals);
GL.BufferData <float>(BufferTarget.ArrayBuffer, (IntPtr)(newGroup.normals.Count * 4), newGroup.normals.ToArray <float>(), BufferUsageHint.StaticDraw);
GL.EnableVertexAttribArray(2);
GL.VertexAttribPointer(2, 3, VertexAttribPointerType.Float, false, 3 * 4, 0);
}
//tangents
if (newGroup.tangents.Count > 0)
{
// Create the buffer for the tangents
GL.GenBuffers(1, out newGroup.vbo_tangents);
GL.BindBuffer(BufferTarget.ArrayBuffer, newGroup.vbo_tangents);
GL.BufferData <float>(BufferTarget.ArrayBuffer, (IntPtr)(newGroup.normals.Count * 4), newGroup.tangents.ToArray <float>(), BufferUsageHint.StaticDraw);
GL.EnableVertexAttribArray(3);
GL.VertexAttribPointer(3, 3, VertexAttribPointerType.Float, false, 3 * 4, 0);
}
//binormals
if (newGroup.binormals.Count > 0)
{
// Create the buffer for the tangents
GL.GenBuffers(1, out newGroup.vbo_binormals);
GL.BindBuffer(BufferTarget.ArrayBuffer, newGroup.vbo_binormals);
GL.BufferData <float>(BufferTarget.ArrayBuffer, (IntPtr)(newGroup.normals.Count * 4), newGroup.binormals.ToArray <float>(), BufferUsageHint.StaticDraw);
GL.EnableVertexAttribArray(4);
GL.VertexAttribPointer(4, 3, VertexAttribPointerType.Float, false, 3 * 4, 0);
}
groups.Add(newGroup);
GL.BindVertexArray(0);
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
