/// <inheritdoc />
public CameraInfoCache(ICameraInfo cameraInfo)
{
// raw
// world space -> camera space
MatrixView = MatrixEx.LookAtRH(cameraInfo.Position.ToVector3D(), cameraInfo.Target.ToVector3D(), cameraInfo.UpVector);
MatrixViewInverse = MatrixView.Inverse();
// camera space -> clip space
MatrixProjection = cameraInfo.Projection.GetMatrixProjection();
MatrixProjectionInverse = MatrixProjection.Inverse();
// clip space -> screen space
MatrixViewport = MatrixEx.Viewport(cameraInfo.Viewport);
MatrixViewportInverse = MatrixViewport.Inverse();
// multiplicatives
// world space -> camera space -> clip space
MatrixViewProjection = MatrixView * MatrixProjection;
MatrixViewProjectionInverse = MatrixViewProjection.Inverse();
// world space -> camera space -> clip space -> screen space
MatrixViewProjectionViewport = MatrixViewProjection * MatrixViewport;
MatrixViewProjectionViewportInverse = MatrixViewProjectionViewport.Inverse();
}
private void DrawPolyline(IEnumerable <Point3D> points, Space space, Pen pen)
{
switch (space)
{
case Space.World:
var t = GetDeltaTime(new TimeSpan(0, 0, 0, 10));
var angle = t * Math.PI * 2;
var radius = 2;
// view matrix
var cameraPosition = new Vector3D(Math.Sin(angle) * radius, Math.Cos(angle) * radius, 1);
var cameraTarget = new Vector3D(0, 0, 0);
var cameraUpVector = new UnitVector3D(0, 0, 1);
var matrixView = MatrixEx.LookAtRH(cameraPosition, cameraTarget, cameraUpVector);
// projection matrix
var fovY = Math.PI * 0.5;
var aspectRatio = (double)BufferSize.Width / BufferSize.Height;
var nearPlane = 0.001;
var farPlane = 1000;
// ReSharper disable once UnusedVariable
var matrixPerspective = MatrixEx.PerspectiveFovRH(fovY, aspectRatio, nearPlane, farPlane);
var fieldHeight = 3;
var fieldWidth = fieldHeight * aspectRatio;
// ReSharper disable once UnusedVariable
var matrixOrthographic = MatrixEx.OrthoRH(fieldWidth, fieldHeight, nearPlane, farPlane);
var matrixProjection = matrixPerspective;
// view space (NDC) to screen space matrix
var matrixViewport = MatrixEx.Viewport(Viewport);
DrawPolylineScreenSpace((matrixView * matrixProjection * matrixViewport).Transform(points), pen);
break;
case Space.View:
DrawPolylineScreenSpace(MatrixEx.Viewport(Viewport).Transform(points), pen);
break;
case Space.Screen:
DrawPolylineScreenSpace(points, pen);
break;
default:
throw new ArgumentOutOfRangeException(nameof(space), space, null);
}
}
