code: func RectWHD(x, y, z, w, h, d float32) Rectangle {
  	return Rectangle{
  		Min: Vec3{x, y, z},
  		Max: Vec3{x + w, y + h, z + d},
  	}
  }
docs: // RectWHD returns a rectangle whose origin is Vec3{x,y,z}, w and h are its
  // width, height and depth.