class MyHandler : RenderEventHandler
{
    Actor a;
    int camera;

    override void RenderFrame()
    {
        camera = 0;
    }

    override void RenderCamera()
    {
        camera++;

        ThinkerIterator ti = ThinkerIterator.Create('TestActor');
        TestActor mo;
        while (mo = TestActor(ti.Next()))
        {
            // if camera is not #0, make the actor translucent 50%
            // otherwise 100%
            mo.alpha = (camera == 1) ? 1.0 : 0.5;
        }
    }
}

class TestActor : Actor
{
    Default
    {
        +NOBLOCKMAP;
        +NOGRAVITY;
        +WALLSPRITE;

        RenderStyle 'Translucent';
    }

    States
    {
    Spawn:
        TNT1 A 1;
        loop;
    }

    override void BeginPlay()
    {
        Super.BeginPlay();
        A_Log(String.Format("picnum = %d", picnum));
        picnum = TexMan.CheckForTexture("M_DOOM", TexMan.Type_Any);
        if (!picnum.Exists() || !picnum.IsValid())
        {
            A_Log("failed");
            Destroy();
            return;
        }
        A_Log("ok");
        //A_Log(String.Format("picnum = %d", picnum));

        // test: register handler
        MyHandler hndlr = MyHandler(EventHandler.CreateOnce('MyHandler'));
        if (hndlr)
        {
            hndlr.a = self;
            EventHandler.Register(hndlr);
        }

        SetOrigin((pos.x, pos.y, pos.z+48.0), false);
    }

    override void Tick()
    {
        Super.Tick();
        //A_Log(String.Format("picnum = %d", picnum));
    }
}