updateProgress

This method is called by PathEngine to report progress.

void updateProgress(const char* description, float percent);

	description		A C string with a human readable text description of the sub-process currently underway. This string is only valid for the duration of this method, and must not be retained after the method returns.
	percent		The amount of progress within the current sub-process, as a fractional percentage between 0 and 1. 0 corresponds to no progress, 1 corresponds to sub-process completion.