character controller - ignore collision based on tags

hi, im want to make a feature where the player can move through objects but not walls or the terrain

I found Physics.IgnoreCollision in the documentation but how do I make it so that it ignores collides based on their tag.

 

Maybe instead assign layers for Terrain, Player, Objects. Then in the Physics settings you can set with layers collide with each other and which don't.

 

You can't by tags, it's by layer.

It's done by layer, because layers are done by a bit mask, which can be done efficiently in the engine. Tags on the other hand are just strings, which can be expensive to mask.

 

ok, thanks for that
I've just briefly gone over layers and have made some for the environment and items but what do I type in script to trigger this effect. Looking at the documentation I found-
Physics.IgnoreLayerCollision(int1, int2, bool)
im guessing that int1 is the player and int2 is the layer with the colliders I want to ignore but why are they integers when my layers have names?