todo:

.) try some lighting effects in castle...
	a point light emanating from chalice on pedestal,
	if "success"=true;  It would affect:
	.) pictobj.draw(ceil
	.) droomobj.draw(cdo
	.) both use holetexshadid: 
		texobjFog.vs, texobjHole.fs
	=====================================
	.) pictobj.draw(wallmoor
	.) rectobj.draw(floor
	.) pictobj.draw(rug
	.) all 3 use pgmtexshadid: 
		texobjFog.vs, texobjFog.fs
	==================================
	See avent-draw_castle.adb


.) add quicksand;
.) add magnet to grab the chalice key from quicksand;

.) moorish shape:  8 pt star = union of 2 squares
.) add other orange, & red maze
