I want to line trace JUST the landscape without any other objects interfering.
If i create a new Line Trace Channel in my project settings, is that channel only going to detect objects that i specifically set to custom then tick the new channel. Or ar all objects automatically detected by the new trace?
When you create a new channel you get to choose the default behaviour - Block, Overlap, Ignore. Best set it to ignore. In the collision settings of any mesh you can then override this default behaviour.