you can use the 'trace_hit' instead:
Quote:
trace_hit Nonzero if c_trace hit something, otherwise 0.
from the online manual

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt