ref: 4c1435a0346ab111b5d9fec0abf5910952b7950e
dir: /chase.c/
#include "quakedef.h" cvar_t chase_active = {"chase_active", "0"}; static cvar_t chase_back = {"chase_back", "100"}; static cvar_t chase_up = {"chase_up", "16"}; static cvar_t chase_right = {"chase_right", "0"}; static vec3_t chase_dest; void Chase_Init (void) { Cvar_RegisterVariable (&chase_back); Cvar_RegisterVariable (&chase_up); Cvar_RegisterVariable (&chase_right); Cvar_RegisterVariable (&chase_active); } void TraceLine (vec3_t start, vec3_t end, vec3_t impact) { trace_t trace; memset(&trace, 0, sizeof trace); SV_RecursiveHullCheck (cl.worldmodel->hulls, 0, 0, 1, start, end, &trace); VectorCopy (trace.endpos, impact); } void Chase_Update (void) { int i; float dist; vec3_t forward, up, right; vec3_t dest, stop; // if can't see player, reset AngleVectors (cl.viewangles, forward, right, up); // calc exact destination for (i=0 ; i<3 ; i++) chase_dest[i] = r_refdef.vieworg[i] - forward[i]*chase_back.value - right[i]*chase_right.value; chase_dest[2] = r_refdef.vieworg[2] + chase_up.value; // find the spot the player is looking at VectorMA (r_refdef.vieworg, 4096, forward, dest); TraceLine (r_refdef.vieworg, dest, stop); // calculate pitch to look at the same spot from camera VectorSubtract (stop, r_refdef.vieworg, stop); dist = DotProduct (stop, forward); if (dist < 1) dist = 1; r_refdef.viewangles[PITCH] = -atan(stop[2] / dist) / M_PI * 180; // move towards destination VectorCopy (chase_dest, r_refdef.vieworg); }