Hi does anybody know where i could find infromation to assist me in making a ray tracing reverb in maxmsp?

Till now i have been able to specify a number of reflection points within a predifined space and using a number of delays have some short of early reflection patch. However from what i understand i need to get into some kind of statistical distribution in order to calculate the possible ray-paths between a 'source' and a 'listener' and this is the point where i am stuck.

Thanks for any help