public void DrawMeshes(Mesh[] meshes, Color color) {
var view = Matrix.LookAtLH(camera.Position, camera.Target, Vector.UnitY);
var projection = Matrix.PerspectiveFovLH((float)(Math.PI / 4.0), (float)Width / Height, 0.1f, 1);
foreach (var mesh in meshes) {
var rotation = Matrix.Rotation(mesh.Rotation);
var translation = Matrix.Translation(mesh.Position);
var world = rotation * translation;
var transform = world * view * projection;
foreach (var face in mesh.Surfaces) {
var v1 = Project(mesh.Vertices[face.A], transform);
var v2 = Project(mesh.Vertices[face.B], transform);
var v3 = Project(mesh.Vertices[face.C], transform);
DrawTriangle(v1, v2, v3, color);
}
}
}
public static Mesh[] FromBabylonModel(string fileName) {
var j = JsonValue.FromFile(fileName);
var meshes = new List<Mesh>();
foreach (var jmesh in j["meshes"].Values) {
var mesh = new Mesh();
var uvCount = jmesh["uvCount"].ValueOf();
var verticesStep = new[] { 6, 8, 10 }[uvCount];
var vertices = new List<Vector>();
var verticesArray = jmesh["vertices"];
var verticesCount = verticesArray.Count / verticesStep;
for (var i = 0; i < verticesCount; i++) {
var x = (float)verticesArray[i * verticesStep].ValueOf();
var y = (float)verticesArray[i * verticesStep + 1].ValueOf();
var z = (float)verticesArray[i * verticesStep + 2].ValueOf();
vertices.Add(new Vector(x, y, z));
}
mesh.Vertices = vertices.ToArray();
var indices = jmesh["indices"];
var surfaceCount = indices.Count / 3;
var surfaceList = new List<Surface>();
for (var i = 0; i < surfaceCount; i++) {
var a = indices[i * 3].ValueOf();
var b = indices[i * 3 + 1].ValueOf();
var c = indices[i * 3 + 2].ValueOf();
surfaceList.Add(new Surface { A = a, B = b, C = c });
}
mesh.Surfaces = surfaceList.ToArray();
var position = jmesh["position"];
mesh.Position = new Vector(
(float)position[0].ValueOf(),
(float)position[1].ValueOf(),
(float)position[2].ValueOf()
);
meshes.Add(mesh);
}
return meshes.ToArray();
}