Models (planes) billboard?

Logan MTM · Post by **Logan MTM** » Wed Oct 14, 2020 4:11 pm

There is any change to bring models billboard back? I know its seems useless but trust me, modders always find a way to use everything.
There is the thing: I did pbr for all dropable guns but, as you know, sprites don't work with pbt, Models does. The big problem is the fact that plane models needs to billboard.
I did some tricks to emulate this behaviour creating new actors that modeldef calls plane models with the gun sprite as skin. The A_FaceTarget do the magic but isn't perfect.

SanyaWaffles · Post by **SanyaWaffles** » Sat Oct 17, 2020 8:50 pm

I wasn't aware that models even could billboard like a sprite.

I don't recall that even being a thing.

Do you know what the flag/feature was called by chance? I could try looking around.

Post by **Graf Zahl** » Sat Oct 17, 2020 11:43 pm

No, models cannot billboard, the sprite related projection math is not run for them. And "modders will find a way to use everything" is not a good justification for a bad feature.
The problems this may cause down the line cannot simply be discounted for some shortsighted convenience reasons.
And the one you mention is not good enough. The reason why sprites cannot do PBR is because they have no dimension and no orientation in the world. A billboarded model also has no dimension and no orientation in the world so it'd be subject to the exact same problem, i.e. PBR would have to be disabled.

Logan MTM · Post by **Logan MTM** » Sun Oct 18, 2020 4:14 pm

SanyaWaffles wrote:Do you know what the flag/feature was called by chance? I could try looking around.

No. Thank you dude.

Graf Zahl wrote:The reason why sprites cannot do PBR is because they have no dimension and no orientation in the world. A billboarded model also has no dimension and no orientation in the world so it'd be subject to the exact same problem, i.e. PBR would have to be disabled.

I got it.
There is any way to emulate BILLBOARD? I'm almost there

Post by **Gez** » Mon Oct 19, 2020 3:03 am

Some model formats (in other engines; not talking about GZDoom here) allow to have parts of the model billboarded -- it's often used for trees, where the trunk and branches are regular 3D geometry but foliage is billboarded, creating a dense foliage look from any direction without having to actually have thousands upon thousands of polygoned leaves.

Logan MTM · Post by **Logan MTM** » Fri Oct 23, 2020 3:55 pm

Well I don't know if officially is possible to do that in GZDoom, Graf said No but unoficially is done.

ZDoom