+FORCE[X]YBILLBOARD for some things' zscripts

[axredneck]

I propose to set FORCEXYBILLBOARD for:

• flying/floating things, fireballs especially
• effects like RocketSmokeTrail, Blood, TeleportFog etc.
• spherical powerups like InvulnerabilitySphere or Megasphere
• floating items from Hexen/Heretic, e.g. mana and bombs
• flying/floating monsters maybe (Cacodemon etc.)

Also i propose to set FORCEYBILLBOARD for torches, poles and other tall things, and also to add options to "Display Options -> OpenGL Renderer -> Sprite Billboard" to "force" and "prefer" FORCEXYBILLBOARD or FORCEYBILLBOARD.
Sadly all this is not achieveable with "replaces" Decorate/ZScript keyword because it changes name of class and so causes some bugs, e.g. fireballs not leaving decals when hitting walls.

[Pixel Eater]

I too think this is necessary- I have an incomplete mod on hold that does it the Decorate way. I wasn't aware of the decal issue though and if I recall, it prevented the Icon of Sin from spawning demons as well.

[Graf Zahl]

You forget that this may break Dehacked mods which replace these items with something non-standard, like additional monsters.
Not to mention that FORCING this is a no-go. Something like PREFERXYBILLBOARD, maybe but it needs to be switchable for compatibility with old mods.

[axredneck]

Something like PREFERXYBILLBOARD, maybe but it needs to be switchable for compatibility with old mods.

Totally agree.
Also ability to "extend" classes which are defined somewhere in gzdoom.pk3 can be good alternative.

[Rachael]

Not to mention that FORCING this is a no-go. Something like PREFERXYBILLBOARD, maybe but it needs to be switchable for compatibility with old mods.

I was pretty much going to say exactly this.

Doesn't sound like it should be too hard for me to do, and in fact, it might be really useful.

[Nash]

Not to mention that FORCING this is a no-go. Something like PREFERXYBILLBOARD, maybe but it needs to be switchable for compatibility with old mods.

I was pretty much going to say exactly this.

Doesn't sound like it should be too hard for me to do, and in fact, it might be really useful.

Seconded. You handled it pretty well with the "vanilla transparency" issue; I think a similar solution can be applied here.