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Duplicate Question and multiple technical issues in a question
Custom collision
English is no my primary language , bare with me please
so ive havent touched unity in 2 years and i remember one of the problem i had was making collision detection that detect if the surface is a wall , the ground or ceiling , and how to prevent stuff from going trough the ground or walls when pushed or falling at high speed
im getting back to work on a project ive lost before i went to help my family and im gonna need to read and make some more coding to get back into it
Welcome back to Unity. Your English is fine, but your question is both duplicate of questions that have been asked many times, and it contains multiple technical questions. Unity Answers addresses a single specific technical question. For finding objects, the typical solutions is 'tags'. There is no perfect solution for going through things, but there are several ways to mitigate the issue. The one that tends to have the most impact is to reduce the 'fixedTimestep'. Search for the other methods.
Rigidbody is your friend. Avoid position modification and Translate.
...in a nutshell.
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