public void TransformChaining()
{
var expected = new Vector3(1, 0, 2);
var transform = new Transform3D()
.Translate(new Vector3(1, 0, 0))
.RotateY(-Math.PI / 2)
.Translate(new Vector3(2, 0, 0));
var vector = new Vector3(0, 0, 0);
var actual = transform.Apply(vector);
Assert.AreEqual(expected, actual);
}
protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
var width = this.ActualWidth;
var height = this.ActualHeight;
Func<Vector3, Point?> toPoint = position =>
Math.Abs(position.Z) > 1
? default(Point?)
: new Point(
(-position.X + 1.0) / 2.0 * width,
(position.Y + 1.0) / 2.0 * height);
var view = Matrix44.GetPerspective(Math.PI / 4, width / height, 0.1, 100.0);
var viewTransform = new Transform3D(view)
.Translate(new Vector3(this.Offset?.X ?? 0.0, this.Offset?.Y ?? 0.0, this.Offset?.Z ?? 0.0))
;
//var offset = new Vector3(this.Offset?.X ?? 0.0, this.Offset?.Y ?? 0.0, this.Offset?.Z ?? 0.0);
foreach (var mesh in this.Meshes)
{
foreach (var face in mesh.Faces)
{
var prev = viewTransform.Apply(face.Vertices.Last() /*+ offset*/);
foreach (var vertex in face.Vertices)
{
var position = viewTransform.Apply(vertex /*+ offset*/);
var pp = toPoint(prev);
var pc = toPoint(position);
if(pp.HasValue && pc.HasValue)
{
drawingContext.DrawLine(new Pen(Brushes.Red, 1), pp.Value, pc.Value);
}
prev = position;
}
}
}
}