How to use sizeAttenuation of SpriteMaterial in the Orthographic Camera?
Objects in the background have no reason to look smaller from an orthographic camera… If you want to do that, either use a perspective camera, or manually reduce the scale of the sprites in the background.
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Your answer just brings up another question. How do you scale a sprite/object by the zoom factor of a orthographic camera to keep the same size?
you can get camera.zoom and set your sprite.scale with zoom per 10ms or other time