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Windows collision issues when using a shader

Hi there,

I have some weird issue. I am working on a brickout game with perfectly working balls and bricks collections functions. but when I use a shader for a passive object ( in the background), it is effecting the other objects collusions ( ball got stock on bricks or not bouncing incorrectly).

Any idea why this is happening?
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You will have better results from the community if you post in the programming forum showing the relevant code for your collisions/drawing.