/**
* @brief Checks whether a point is "visible" from the edicts position
* @sa FrustumVis
*/
bool G_FrustumVis (const Edict* from, const vec3_t point)
{
if (G_IsActiveCamera(from)) {
/* it's a 360 degree camera */
if (from->camera.rotate)
return true;
}
return FrustumVis(from->origin, from->dir, point);
}
/**
* @brief test if check is visible by from
* @param[in] team Living team members are always visible. If this is a negative
* number we inverse the team rules (see comments included). In combination with VT_NOFRUSTUM
* we can check whether there is any edict (that is no in our team) that can see @c check
* @param[in] from is from team @c team and must be a living actor
* @param[in] check The edict we want to get the visibility for
* @param[in] flags @c VT_NOFRUSTUM, ...
*/
bool G_Vis (const int team, const Edict* from, const Edict* check, const vischeckflags_t flags)
{
vec3_t eye;
/* if any of them isn't in use, then they're not visible */
if (!from->inuse || !check->inuse)
return false;
/* only actors and 2x2 units can see anything */
if (!G_IsLivingActor(from) && !G_IsActiveCamera(from))
return false;
/* living team members are always visible */
if (team >= 0 && check->getTeam() == team && !G_IsDead(check))
return true;
/* standard team rules */
if (team >= 0 && from->getTeam() != team)
return false;
/* inverse team rules */
if (team < 0 && check->getTeam() == -team)
return false;
/* check for same pos */
if (VectorCompare(from->pos, check->pos))
return true;
if (!G_IsVisibleOnBattlefield(check))
return false;
/* view distance check */
const int spotDist = G_VisCheckDist(from);
if (VectorDistSqr(from->origin, check->origin) > spotDist * spotDist)
return false;
/* view frustum check */
if (!(flags & VT_NOFRUSTUM) && !G_FrustumVis(from, check->origin))
return false;
/* get viewers eye height */
G_ActorGetEyeVector(from, eye);
/* line trace check */
switch (check->type) {
case ET_ACTOR:
case ET_ACTOR2x2:
return G_ActorVis(eye, from, check, false) > ACTOR_VIS_0;
case ET_ITEM:
case ET_CAMERA:
case ET_PARTICLE:
return !G_LineVis(eye, check->origin);
default:
return false;
}
}
int G_VisCheckDist (const Edict* const ent)
{
if (G_IsActiveCamera(ent))
return MAX_SPOT_DIST_CAMERA;
if (G_IsActor(ent))
return MAX_SPOT_DIST * G_ActorGetInjuryPenalty(ent, MODIFIER_SIGHT);
return MAX_SPOT_DIST;
}
