Sketchup - Realtime Material on Rendered Image

This was an experimental work .
1. The areas where material needs to be changed will be applied with white material.
2. View is rendered.
3. Image is converted to PNG format using Photoshop. White areas will be changed into transparent shadows.
4. Rendered image will be applied as material over a plane placed exactly in front of scene.
5. Areas without the shadow area will be deleted in the plane.