public static bool IsPointInMobVisionCone(
Mob mob,
Point3d point)
{
MobType mobType = mob.MobType;
Vector2d mobToPoint = (point - mob.Position).ToVector2d();
Vector2d facingVector = MathConstants.GetUnitVectorForAngle(mob.Angle);
float cosHalfAngle = (float)Math.Cos(mob.MobType.VisionCone.GetHalfAngle());
float cosAngleToProp = facingVector.Dot(mobToPoint);
float pointDistanceSquared = Point2d.DistanceSquared(point, mob.Position);
float minVisionCircleDistanceSquared = WorldConstants.ROOM_TILE_SIZE * WorldConstants.ROOM_TILE_SIZE;
float minVisionConeDistanceSquared = (float)(mobType.VisionCone.distance * mobType.VisionCone.distance);
bool isInVisionCone =
(pointDistanceSquared <= minVisionCircleDistanceSquared) ||
((cosAngleToProp > cosHalfAngle) && (pointDistanceSquared <= minVisionConeDistanceSquared));
return(isInVisionCone);
}