Glass might not transmit enough internal light to cause projection onto the foreground.
Add a Light Cone Down lamp in front [on the outside] of the glass.
Make the light cone radius large: 2-3m
Tilt it downward somewhat.
Adjust other settings to suit.
This should light the foreground.
Another option is the window light, placed against the glazing to shine outward.
Dwight Atkinson
