zandronum, example code

        case PCD_GETACTORX:
        case PCD_GETACTORY:
        case PCD_GETACTORZ:
            {
                AActor *actor = SingleActorFromTID(STACK(1), activator);
                if (actor == NULL) {
                    if (playeringame[consoleplayer] == true && NETWORK_GetState() != NETSTATE_SERVER) {
                        actor = players[consoleplayer].camera;
                    }
                }
                if (actor == NULL)
                {
                        STACK(1) = 0;
                }
                else if (pcd == PCD_GETACTORZ)
                {
                    STACK(1) = actor->z + actor->GetBobOffset();
                }
                else
                {
                    STACK(1) =  (&actor->x)[pcd - PCD_GETACTORX];
                }
            }
            break;