/// <summary>
/// Do the single check from camera to the fixed position.
/// Hit actors put in _scratchActors.
/// </summary>
/// <param name="cameraPos"></param>
/// <param name="targetPos"></param>
/// <param name="radius"></param>
private void CheckLOSToTarget(Vector3 cameraPos, Vector3 targetPos, float radius)
{
Debug.Assert(_scratchLOS.Count == 0);
if (CollSys.TestAll(
cameraPos,
targetPos,
radius,
_scratchLOS))
{
ActorsFromHitInfo(_scratchLOS, _scratchActors);
}
_scratchLOS.Clear();
}
/// <summary>
/// Just see what's intersecting the sphere around the camera.
/// </summary>
/// <param name="camera"></param>
private void CheckCameraSphere(Camera camera)
{
Debug.Assert(_scratchLOS.Count == 0);
Debug.Assert(_scratchActors.Count == 0);
Vector3 camPos = camera.ActualFrom;
float camRadius = camera.NearClip * 5.0f;
if (CollSys.TestAll(
camPos,
camPos,
camRadius,
_scratchLOS))
{
ActorsFromHitInfo(_scratchLOS, _scratchActors);
}
_scratchLOS.Clear();
}
/// <summary>
/// Test to see if a bleep hit anything, object or terrain.
/// </summary>
/// <param name="shooter"></param>
/// <param name="bleeps"></param>
/// <param name="particle"></param>
/// <returns></returns>
private bool HitSomething(GameActor shooter, Bleep bleep)
{
Vector3 start = bleep.Position;
Vector3 end = start + bleep.Velocity * Time.GameTimeFrameSeconds;
Vector3 terrainHit = end;
bool hitTerrain = bleep.Life - bleep.TTL >= bleep.TTTerraHit;
if (hitTerrain)
{
/// terrain hit is current position
/// - what we've travelled already (vel * (life - ttl))
/// + time from beginning to terrain hit (vel * ttTerraHit)
/// We use end as current position because we've already updated TTL
/// but haven't yet advanced .Position. When we do advance .Position,
/// it will be to "end".
terrainHit = end + bleep.Velocity * (bleep.TTTerraHit - (bleep.Life - bleep.TTL));
}
const float kBleepRadius = 0.25f;
GameActor hitThing = null;
Vector3 hitPoint = terrainHit;
if (CollSys.TestAll(
start,
end,
kBleepRadius,
_scratchHitInfo))
{
for (int i = 0; i < _scratchHitInfo.Count; ++i)
{
GameActor other = _scratchHitInfo[i].Other;
if (!ExcludedHitThing(shooter, other))
{
hitThing = other;
hitPoint = _scratchHitInfo[i].Contact;
break;
}
}
_scratchHitInfo.Clear();
}
if (hitTerrain && (hitThing != null))
{
if (Vector3.DistanceSquared(start, terrainHit) < Vector3.DistanceSquared(start, hitPoint))
{
hitThing = null;
hitPoint = terrainHit;
}
}
if (hitThing != null)
{
OnHit(shooter, hitThing, hitPoint, bleep);
}
else if (hitTerrain)
{
OnHit(shooter, null, hitPoint, bleep);
ExplosionManager.CreateSpark(hitPoint, 3, 0.4f, 1.0f);
}
return(hitTerrain || (hitThing != null));;
}