Please can someone direct me to a demo in which the camera will not go thru the level walls.My level is an interior one.

firstly how are you moving your camera?

Are you using a c_move function or are you just pressing 0 during the game?

an easy way:

1- crate an entity in med (cube)
2- place the cube in your level in wed
3- give your cube-entity the camera-function (dont forget to make your cube invisible)

with ent_move and for instance "ENABLE_BLOCK" flag - you can define the collisiondetection.

If you still need help, write again!

thanks