VIRO-3760: add transparent shadow plane test
VIRO-3760: add transparent shadow plane test

Simple modification to remove the colored plane
used for current AR tests and instead use a
transparent plane.


Former-commit-id: 637b5f01a3326868a763a60eeb3550522cbadab1
viromedia/viro,viromedia/viro,viromedia/viro,viromedia/viro