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);
}
}
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);
}
}
/// <summary>
/// Create new <see cref="ICameraInfo"/> based on mouse offset in view space and orbit origin.
/// </summary>
public static ICameraInfo Orbit(ICameraInfo cameraInfoStart, Vector3D mouseOffsetView, Point3D orbitOrigin)
{
// default input
var eye = cameraInfoStart.Position;
var target = cameraInfoStart.Target;
// create local coordinate system
var zAxis = cameraInfoStart.UpVector;
var yzPlane = new Plane(new Point3D(), cameraInfoStart.GetEyeDirection().ToPoint3D(), zAxis.ToPoint3D());
var xAxis = yzPlane.Normal;
var xzPlane = new Plane(new Point3D(), zAxis.ToPoint3D(), xAxis.ToPoint3D());
var yAxis = xzPlane.Normal;
var matrixWorldToLocal = (Matrix <double>) new CoordinateSystem(new Point3D(), xAxis, yAxis, zAxis);
// transform to local system
orbitOrigin = matrixWorldToLocal.Transform(orbitOrigin);
eye = matrixWorldToLocal.Transform(eye);
target = matrixWorldToLocal.Transform(target);
// figure out angles (how much to rotate)
GetSphereAngles(mouseOffsetView, (target - eye).Normalize(), out var thetaDelta, out var phiDelta);
// rotate horizontally
var matrixRotationHorizontal = MatrixEx.Rotate(UnitVector3D.ZAxis, thetaDelta.Radians).TransformAround(orbitOrigin);
eye = matrixRotationHorizontal.Transform(eye);
target = matrixRotationHorizontal.Transform(target);
// rotate vertically
var phiPlane = new Plane(eye, target, target + UnitVector3D.ZAxis);
var matrixRotationVertical = MatrixEx.Rotate(phiPlane.Normal, phiDelta.Radians).TransformAround(orbitOrigin);
eye = matrixRotationVertical.Transform(eye);
target = matrixRotationVertical.Transform(target);
// transform back to world system
var matrixLocalToWorld = matrixWorldToLocal.Inverse();
eye = matrixLocalToWorld.Transform(eye);
target = matrixLocalToWorld.Transform(target);
// update camera info
return(new CameraInfo(eye, target, cameraInfoStart.UpVector, cameraInfoStart.Projection.Cloned(), cameraInfoStart.Viewport));
}
/// <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
));
}
}