private void DrawGeometry()
{
// screen space
DrawPolyline(new[] { new Point3D(3, 20, 0), new Point3D(140, 20, 0) }, Space.Screen, Pens.Gray);
// view space
DrawPolyline(new[] { new Point3D(-0.9, -0.9, 0), new Point3D(0.9, -0.9, 0) }, Space.View, Pens.Gray);
// world space bigger cube
var angle = GetDeltaTime(new TimeSpan(0, 0, 0, 5)) * Math.PI * 2;
var matrixModel =
MatrixEx.Scale(0.5) *
MatrixEx.Rotate(new UnitVector3D(1, 0, 0), angle) *
MatrixEx.Translate(1, 0, 0);
foreach (var cubePolyline in CubePolylines)
{
DrawPolyline(matrixModel.Transform(cubePolyline), Space.World, Pens.White);
}
// world space smaller cube
angle = GetDeltaTime(new TimeSpan(0, 0, 0, 1)) * Math.PI * 2;
matrixModel =
MatrixEx.Scale(0.5) *
MatrixEx.Rotate(new UnitVector3D(0, 1, 0), angle) *
MatrixEx.Translate(0, 1, 0) *
matrixModel;
foreach (var cubePolyline in CubePolylines)
{
DrawPolyline(matrixModel.Transform(cubePolyline), Space.World, Pens.Yellow);
}
}
private void DrawGeometry()
{
// bigger cube
var angle = GetDeltaTime(new TimeSpan(0, 0, 0, 5)) * Math.PI * 2;
var matrixModel =
MatrixEx.Scale(0.5) *
MatrixEx.Rotate(new UnitVector3D(1, 0, 0), angle) *
MatrixEx.Translate(1, 0, 0);
foreach (var cubePolyline in CubePolylines)
{
DrawPolyline(matrixModel.Transform(cubePolyline), Space.World, Pens.White);
}
// smaller cube
angle = GetDeltaTime(new TimeSpan(0, 0, 0, 1)) * Math.PI * 2;
matrixModel =
MatrixEx.Scale(0.5) *
MatrixEx.Rotate(new UnitVector3D(0, 1, 0), angle) *
MatrixEx.Translate(0, 1, 0) *
matrixModel;
foreach (var cubePolyline in CubePolylines)
{
DrawPolyline(matrixModel.Transform(cubePolyline), Space.World, Pens.Yellow);
}
}
/// <summary>
/// Get some primitives to demonstrate hierarchical matrix multiplication.
/// </summary>
private static IEnumerable <IPrimitive> GetPrimitivesCubes()
{
var duration = new TimeSpan(DateTime.UtcNow.Ticks);
// world space bigger cube
var angle = GetTimeSpanPeriodRatio(duration, new TimeSpan(0, 0, 0, 5)) * Math.PI * 2;
var matrixModel =
MatrixEx.Scale(0.5) *
MatrixEx.Rotate(new UnitVector3D(1, 0, 0), angle) *
MatrixEx.Translate(1, 0, 0);
foreach (var cubePolyline in CubePolylines)
{
yield return(new Materials.Position.Primitive
(
new PrimitiveBehaviour(Space.World),
PrimitiveTopology.LineStrip,
matrixModel.Transform(cubePolyline).Select(position => new Materials.Position.Vertex(position)).ToArray(),
Color.White
));
}
// world space smaller cube
angle = GetTimeSpanPeriodRatio(duration, new TimeSpan(0, 0, 0, 1)) * Math.PI * 2;
matrixModel =
MatrixEx.Scale(0.5) *
MatrixEx.Rotate(new UnitVector3D(0, 1, 0), angle) *
MatrixEx.Translate(0, 1, 0) *
matrixModel;
foreach (var cubePolyline in CubePolylines)
{
yield return(new Materials.Position.Primitive
(
new PrimitiveBehaviour(Space.World),
PrimitiveTopology.LineStrip,
matrixModel.Transform(cubePolyline).Select(position => new Materials.Position.Vertex(position)).ToArray(),
Color.Yellow
));
}
}