I am trying to use a planar to show a holographic display. This display is simply an emmissive texture with alpha transparency (and works great on cubes and other brushes already). So, I figured I'd use a Planar to put it in my level, but I get "Warning VolumeTest Brush_6 Brush_6 : Brush is planar" error whenever I add a Planar brush.
Any ideas what i'm doing wrong and if Planars are not the way to go, how can I go about adding simply a sheet with a material on it to use as a display?
Thanks in advance!