How to write a script which let the character not enter the wall? Plz tell me details, caz i really have no idea after i saw some answers on internet.
My first instinct: the wall needs a mesh collider component.
If you have a reference to the game object for the wall in your script, try in C#
if (myGameObject.collider==null)
myGameObject.AddComponent<MeshCollider>();
Or from the editor you can just add the collider to the wall.
Make sure your walls (objects) have colliders (highlight character, components > Physics > Mesh [box, etc] Collider)are are set to static objects (select object, check upper right box in the Inspector saying ‘static’)
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