Until just now, when i discovered something peculiar in CL_UpdateTEnts -- there is a for loop inside another for loop, and both loops use the variable "i" as their iterator. Anyway, here's the code (100% pure id software code), see for yourself:
Code: Select all
void CL_UpdateTEnts (void)
{
int i;
beam_t *b;
vec3_t dist, org;
float d;
entity_t *ent;
float yaw, pitch;
float forward;
num_temp_entities = 0;
// update lightning
for (i=0, b=cl_beams ; i< MAX_BEAMS ; i++, b++)
{
if (!b->model || b->endtime < cl.time)
continue;
// if coming from the player, update the start position
if (b->entity == cl.viewentity)
{
VectorCopy (cl_entities[cl.viewentity].origin, b->start);
}
// calculate pitch and yaw
VectorSubtract (b->end, b->start, dist);
if (dist[1] == 0 && dist[0] == 0)
{
yaw = 0;
if (dist[2] > 0)
pitch = 90;
else
pitch = 270;
}
else
{
yaw = (int) (atan2(dist[1], dist[0]) * 180 / M_PI);
if (yaw < 0)
yaw += 360;
forward = sqrt (dist[0]*dist[0] + dist[1]*dist[1]);
pitch = (int) (atan2(dist[2], forward) * 180 / M_PI);
if (pitch < 0)
pitch += 360;
}
// add new entities for the lightning
VectorCopy (b->start, org);
d = VectorNormalize(dist);
while (d > 0)
{
ent = CL_NewTempEntity ();
if (!ent)
return;
VectorCopy (org, ent->origin);
ent->model = b->model;
ent->angles[0] = pitch;
ent->angles[1] = yaw;
ent->angles[2] = rand()%360;
for (i=0 ; i<3 ; i++)
org[i] += dist[i]*30;
d -= 30;
}
}
}