Fix Collision demo after changes to foam.graphics.
Fix Collision demo after changes to foam.graphics.

foam-framework/foam,mdittmer/foam,jacksonic/foam,foam-framework/foam,mdittmer/foam,osric-the-knight/foam,osric-the-knight/foam,mdittmer/foam,jlhughes/foam,jacksonic/foam,osric-the-knight/foam,foam-framework/foam,foam-framework/foam,jlhughes/foam,jlhughes/foam,mdittmer/foam,foam-framework/foam,jacksonic/foam,osric-the-knight/foam,jlhughes/foam,jacksonic/foam