You can turn it into a staticmesh then make the changes.
What you are creating by using “Geometry->Box” is a “BP Brush” object. They aren’t technically meshs. You can make a Static Mesh out of a BP Brush object though… and the Static Mesh can have collisions assigned to it in the editor.
First, make the BP Brush into the shape you want…,. Then, with the BP Brush (Box) selected, the “Details” panel will have “Brush Settings”. You may have to expand the settings to see the “Create Static Mesh” button. Click that and it will ask you where to save the mesh and what to name it. Save it wherever you want in your project.
Then, double click the static mesh and add the collision type you want in the editor. In the Static Mesh editor window that will open up when you double click the static mesh, there will be a button on the top that says “Collision”… this will display the collision primitive on your object… if there is one. You then use the “Collision” drop down menu from the Menu Bar on top and select the type of collision you want!
So If I create a box from under Geometry->Box, I can’t seem to find any collision settings for it. I need it to either generate overlap events or hit events.