Post: #6

line of sight is computed differently based on the Sphere.ini settings you have selected... some of those settings consider the HEIGHT of an object.

Height of an object typically comes from the mul or uop file... so if you just replaced the height=20 object with a height=1 object in you modification of the mul/uop file, that explains why people can see over (and shoot over) your wall. Maybe you can override the height in your ITEMDEF by setting HEIGHT=20 ...but if that doesn't work, you need to fix your mul/uop file.