Ejemplo n.º 1
0
  /**
   * Project a world point through the matrix to get its screen position.
   *
   * @param world the point to project
   * @return its screen position
   */
  @Nullable
  public Vec2i project(@NotNull Vec3f world) {
    Vec4f vec = Matrix.mul(getPmvMatrix(), new Vec4f(world, 1.0f));

    Vec2i screen = null;
    if (vec.getW() != 0.0f) {
      double z = vec.getZ() / vec.getW();
      if (z < 1) {
        int x = (int) ((vec.getX() / vec.getW() * 0.5 + 0.5) * viewport.getWidth());
        int y =
            (int)
                (viewport.getHeight()
                    - (vec.getY() / vec.getW() * 0.5 + 0.5) * viewport.getHeight());
        screen = new Vec2i(x, y);
      }
    }

    return screen;
  }
Ejemplo n.º 2
0
 /** Transforms a pixel in window coordinates to a ray in world coordinates. */
 public static Ray windowToWorld(Camera camera, Viewport viewport, Point windowCoords) {
   Vec2f ndc = viewport.windowToNDC(windowCoords);
   Vec4f n =
       camera
           .getViewInverse()
           .times(camera.getProjectionInverse().times(new Vec4f(ndc.x, ndc.y, -1, 1)));
   n.divide(n.w);
   Vec4f f =
       camera
           .getViewInverse()
           .times(camera.getProjectionInverse().times(new Vec4f(ndc.x, ndc.y, 1, 1)));
   f.divide(f.w);
   return new Ray(n.xyz(), f.minus(n).xyz().normalized());
 }
Ejemplo n.º 3
0
 /** Transforms a point in world coordinates to a pixel in window coordinates. */
 public static Point worldToWindow(Camera camera, Viewport viewport, Vec3f worldCoords) {
   Vec4f clip = camera.getProjection().times(camera.getView().times(new Vec4f(worldCoords, 1)));
   Vec2f ndc = clip.over(clip.w).xy();
   return viewport.ndcToWindow(ndc);
 }