Set the pan and zoom of the scene.
Pan is applied to camera.position and camera.lookAt, while
zoom is applied to
camera.left/camera.bottom/camera.right/camera.top (for 2D and
orthographic) or camera.fov (for perspective)
The camera and projection variables are not changed by pan and zoom, but the the view and projection matrices are.
A pan in the positive direction will move the scene left and down.
A zoom greater than 1 will reduce the left/right/bottom/top or fov effectively magnifying the scene.
Set the pan of the scene.
Pan is applied to camera.position and camera.lookAt.
The camera is changed by pan and zoom, but the resulting view matrix is.
A pan in the positive direction will move the scene left and down.
Scene.
Param: options
scene definition options
Param: onUpdate
callback if scene is updated