The coordinates are not align when they are at the same position

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Two points have the same coordinates in x and y.
However, when I push back the camer, it shows that these two points are not aligned. The misalignment is much bigger when x and y are bigger.
environment: Ubuntu 18 Version of manim: on Feb 13, 2020
### If this is a feature request:
Include the motivation for making this change.

The issue describes a coordinate misalignment in the manim animation engine when points share the same x and y coordinates, with the error increasing with larger coordinate values. Start by examining the camera projection and coordinate transformation code, likely in modules like camera.py or scene.py. Reproduce the bug with a minimal script that places two points at the same position and renders them from different camera distances. Check how manim handles floating-point precision and depth rendering for overlapping objects.

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