Can 3D midtex lines let projectiles pass?

[Enjay]

When using Line_SetIdentification to make a line have 3D midtex blocking, I have come up with a problem. I want the 3D blocking effect to act like a normal impassable line but I can't see anything that allows that. Perhaps I missed it?

To explain my scenario I have made the attached test WAD (requires GZdoom). I need the the player and enemies to be able to walk under and over the bridge. The sides of the bridge are made using a midbars texture. These need to block the player or enemies passing through and falling off the bridge. All shots, however, need to be able to pass through the bridge side bars like normal impassable walls - and that's where the problem arises.

I can't figure out how to do it. The test WAD shows how far I have got. It looks alright and, as far as player/enemy movement is concerned, it works as I want it. However, whilst you are on the bridge, you cannot use projectile based weapons to hit the imps and, equally, you are protected from their fireballs. Hitscan weapons, however, act exactly how I want them to and can shoot through the bars.

Switching on and off line blocking depending on the player location is not an option for me so... any ideas?

[Graf Zahl]

3DMIDTEX lines are solid geometry - with all implications this normally has - including blocking all actors not having the NOCLIP flag.

[Enjay]

Yeah, I figured that the 3DMidTex lines probably have to be like that to allow them to be walked on if they are used for 3D bridges or whatever. Given that the 3DMidTex property doesn't do what I'm looking for, is there an alternative method that would?

[Graf Zahl]

Sorry, but currently there is no solution for your problem. It could be added as a new flag but considering the messy state of this for the old binary map formats it'd probably be UDMF-only and knowing your preference for an editor it wouldn't help you much.

[HotWax]

Given that this would benefit other people besides Enjay, I'd say it's still useful to put in.