private MyRay shootRay(MyPoint3D from, MyPoint3D dir) {
MyRay ray = new MyRay();
ray.setOrigin(from);
dir.normalize();
ray.setDirection(dir);
return ray;
}
private MyRay shootPixelRay(int x, int y) {
MyRay out = new MyRay();
float xPart, yPart;
xPart = (rightViewPlane - leftViewPlane) / widthPix;
yPart = (topViewPlane - bottomViewPlane) / heightPix;
xPart = leftViewPlane + (float) 0.5 * xPart + ((float) x) * xPart;
yPart = bottomViewPlane + (float) 0.5 * yPart + ((float) y) * yPart;
// get ray direction and origin: perspective
// out.setOrigin(viewer);
// MyPoint3D dir = new MyPoint3D(xPart - viewer.getX(), yPart - viewer.getY(), zViewPlane -
// viewer.getZ());
// get ray direction and origin: perpendicular
out.setOrigin(new MyPoint3D(xPart, yPart, viewer.getZ()));
MyPoint3D dir = new MyPoint3D(0, 0, 1);
// normalize
dir.normalize();
out.setDirection(dir);
return out;
}