public static void SaveAsObj(List <SurfacePoint> points, string filename, string textureFilename)
{
var boundingBox = new BoundingBox();
boundingBox.Set(points);
var mesh = GetMesh(points, boundingBox);
using (StreamWriter writer = new StreamWriter(File.Open(filename + MTL, FileMode.Create)))
{
writer.WriteLine("newmtl volume");
writer.WriteLine("Ns 10.0000");
writer.WriteLine("Ni 1.5000");
writer.WriteLine("d 1.0000");
writer.WriteLine("Tr 0.0000");
writer.WriteLine("Tf 1.0000 1.0000 1.0000");
writer.WriteLine("illum 2");
writer.WriteLine("Ka 0.0000 0.0000 0.0000");
writer.WriteLine("Kd 0.0 0.0 0.0");
writer.WriteLine("Ks 0.0000 0.0000 0.0000");
writer.WriteLine("Ke 0.0000 0.0000 0.0000");
writer.WriteLine("map_Ka {0}", textureFilename + PNG);
writer.WriteLine("map_Kd {0}", textureFilename + PNG);
}
using (StreamWriter writer = new StreamWriter(File.Open(filename + OBJ, FileMode.Create)))
{
writer.WriteLine("o volume");
writer.WriteLine("mtllib superficie.mtl");
writer.WriteLine("# vertices (x,y,z)");
foreach (var t in mesh)
{
writer.WriteLine("v {0} {1} {2}", t.a.x, t.a.y, t.a.z);
writer.WriteLine("v {0} {1} {2}", t.b.x, t.b.y, t.b.z);
writer.WriteLine("v {0} {1} {2}", t.c.x, t.c.y, t.c.z);
}
writer.WriteLine();
writer.WriteLine("# normals (i,j,k)");
foreach (var t in mesh)
{
writer.WriteLine("vn {0} {1} {2}", t.a.i, t.a.j, t.a.k);
writer.WriteLine("vn {0} {1} {2}", t.b.i, t.b.j, t.b.k);
writer.WriteLine("vn {0} {1} {2}", t.c.i, t.c.j, t.c.k);
}
writer.WriteLine();
writer.WriteLine("# texture coordinates (u,v)");
foreach (var t in mesh)
{
writer.WriteLine("vt {0} {1}", t.a.u, t.a.v);
writer.WriteLine("vt {0} {1}", t.b.u, t.b.v);
writer.WriteLine("vt {0} {1}", t.c.u, t.c.v);
}
writer.WriteLine();
writer.WriteLine("# faces");
writer.WriteLine("g volume");
writer.WriteLine("usemtl volume");
int index = 1; // indices starts with 1
foreach (var t in mesh)
{
writer.WriteLine("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}", index, index + 1, index + 2);
index += 3;
}
}
}
private static void WriteTextureCoordinates(StreamWriter writer, List <SurfacePoint> points, BoundingBox boundingBox)
{
writer.WriteLine("# texture coordinates (u,v)");
foreach (var point in points)
{
writer.WriteLine("vt {0} {1}",
boundingBox.NormalizeX(point.GridX), boundingBox.NormalizeY(point.GridY));
}
writer.WriteLine();
}
