public static Renderable CreatePlane(int width, int height)
{
Renderable r = new Renderable();
List<float> vertices = new List<float>();
List<float> texcoords = new List<float>();
List<ushort> indices = new List<ushort>();
List<float> normals = new List<float>();
height++;
width++;
float unitWidth = 1f/(float)width;
float unitHeight = 1f/(float)height;
for(int y = 0; y < height; y++)
{
for(int x = 0; x < width; x++)
{
vertices.Add(x);
vertices.Add(0); //Height of 0
vertices.Add(y);
if(y < height - 1 && x < width - 1){
indices.Add((ushort) ( (width * y) + x) );
indices.Add((ushort) ( (width * (y + 1)) + x) );
indices.Add((ushort) ( (width * y) + (x + 1)) );
indices.Add((ushort) ( (width * (y + 1)) + x) );
indices.Add((ushort) ( (width * (y + 1)) + x + 1) );
indices.Add((ushort) ( (width * y) + (x + 1)) );
}
texcoords.Add((float)x/ (float)(width - 1));
texcoords.Add((float)y/ (float)(height - 1));
normals.Add(0);
normals.Add(1);
normals.Add(0);
}
}
r.Vertices = vertices.ToArray();
r.Indices = indices.ToArray();
r.Normals = normals.ToArray();
r.TexCoords = texcoords.ToArray();
//if(texcoords.Contains(1))throw new Exception();
return CalculateTangents(r);
}
public static Renderable LoadModel(string filename)
{
Renderable r = new Renderable();
Model m = ModelLoader.Load(VFS.GenerateRealPath(filename));
r.Vertices = m.Vertices.ToArray();
r.Indices = m.Indices.ToArray();
if(m.Normals != null)r.Normals = m.Normals.ToArray();
if(m.TexCoords != null)r.TexCoords = m.TexCoords.ToArray();
return r;
//return CalculateTangents(r);
}
private static Renderable CalculateTangents(Renderable r)
{
List<float> tangents = new List<float>();
float[] tanFinal = new float[r.Vertices.Length];
for(ushort i = 0; i < r.Indices.Length; i+=3)
{
Vector3 v1 = new Vector3(r.Vertices[r.Indices[i] * 3], r.Vertices[r.Indices[i] * 3 + 1], r.Vertices[r.Indices[i] * 3 + 2]);
Vector3 v2 = new Vector3(r.Vertices[r.Indices[i + 1] * 3], r.Vertices[r.Indices[i+1] * 3 + 1], r.Vertices[r.Indices[i+1] * 3 + 2]);
Vector3 v3 = new Vector3(r.Vertices[r.Indices[i + 2] * 3], r.Vertices[r.Indices[i+2] * 3 + 1], r.Vertices[r.Indices[i+2] * 3 + 2]);
Vector2 tex1 = new Vector2(r.TexCoords[r.Indices[i] * 2], r.TexCoords[r.Indices[i] * 2 + 1]);
Vector2 tex2 = new Vector2(r.TexCoords[r.Indices[i+1] * 2], r.TexCoords[r.Indices[i+1] * 2 + 1]);
Vector2 tex3 = new Vector2(r.TexCoords[r.Indices[i+2] * 2], r.TexCoords[r.Indices[i+2] * 2 + 1]);
Vector3 e1 = v2 - v1;
Vector3 e2 = v3 - v1;
float du1 = tex2.X - tex1.X;
float dv1 = tex2.Y - tex1.Y;
float du2 = tex3.X - tex1.X;
float dv2 = tex3.Y - tex1.Y;
float f = 1.0f/(du1 * dv2 - du2 * dv1);
Vector3 Tangent = new Vector3(f * (dv2 * e1.X - dv1 * e2.X),
f * (dv2 * e1.Y - dv1 * e2.Y),
f * (dv2 * e1.Z - dv1 * e2.Z));
/*tangents.Add(Tangent.X);
tangents.Add(Tangent.Y);
tangents.Add(Tangent.Z);
tangents.Add(Tangent.X);
tangents.Add(Tangent.Y);
tangents.Add(Tangent.Z);
tangents.Add(Tangent.X);
tangents.Add(Tangent.Y);
tangents.Add(Tangent.Z);*/
tanFinal[r.Indices[i] * 3] = Tangent.X;
tanFinal[r.Indices[i] * 3 + 1] = Tangent.Y;
tanFinal[r.Indices[i] * 3 + 2] = Tangent.Z;
tanFinal[r.Indices[i + 1] * 3] = Tangent.X;
tanFinal[r.Indices[i + 1] * 3 + 1] = Tangent.Y;
tanFinal[r.Indices[i + 1] * 3 + 2] = Tangent.Z;
tanFinal[r.Indices[i + 2] * 3] = Tangent.X;
tanFinal[r.Indices[i + 2] * 3 + 1] = Tangent.Y;
tanFinal[r.Indices[i + 2] * 3 + 2] = Tangent.Z;
}
//r.tangents = tangents.ToArray();
r.tangents = tanFinal;
return r;
}