Using CG_Trace

Post by **torhu** » Sun Oct 30, 2005 6:57 am

void	CG_Trace( trace_t *result, const vec3_t start, const vec3_t mins, const vec3_t maxs, const vec3_t end,  int skipNumber, int mask ) {

I think I understand the rest, but what do the mins and maxs parameters do?

Post by **corncobman** » Sun Oct 30, 2005 12:33 pm

It specifies the width of the trace, rather than trace using a line, you can trace with a particular size, and if the sides hit whatever you are tracing for, it will stop.

Post by **^misantropia^** » Sun Oct 30, 2005 2:09 pm

Think of it as doing a sweep with a bounding box.

Post by **torhu** » Mon Oct 31, 2005 12:41 am

I figured that mins and maxs would specify a box, but I'm not quite sure exactly how. Could someone draw me some ascii art to show?

Post by **^misantropia^** » Mon Oct 31, 2005 11:38 am

Think of the player's bounding box, which is 32x32x64 or (-16, -16, -32)-(16, 16, 32). If you run in a straight line, you're bound to bump into something solid sooner or later. Now that's exactly what CG_Trace() does.

Post by **torhu** » Tue Nov 01, 2005 2:46 am

Thanks. Somehow it didn't occur to me that mins and maxs are actually vectors, not single values. Think I've got it now.