[Closed] DECALDEFS colors - does this even do anything?

[Nash]

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decal BloodSplat1
{
   pic "graphics/decals/bsplat1.png"
   colors "FF FF FF" "00 FF FF"
}


The decal doesn't get translated at all. Does this feature even work?

1) Load test file
2) bind mouse1 "spray bloodsplat1"
3) click mouse while standing in front of wall

[Nash]

Sorry, I have to bump this because even though this thread was moved to the Bugs forum as requested, it was silently done so therefore it had no chance of being noticed.

[Graf Zahl]

This looks like a dead feature. The generated translation doesn't seem to be used for anything. Looking at the changelog, the code seems to originate in 2001, and I'm sorry to say I don't have any idea what this was supposed to do.

[Nash]

Sorry for the bump. I'd like to make this feature work. So what exactly is missing? From what I understand, the translation data does get created, but nothing on the render side is using that data, am I right?

I took a look at HWDecal::DrawDecal and see this line:

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state.SetMaterial(tex, CLAMP_XY, decal->Translation, -1);
 

Isn't this supposed to work?

[Graf Zahl]

and I'm sorry to say I don't have any idea what this was supposed to do.

Wasn't this part clear enough?

[Nash]

I suppose I did not explain myself clearly. I'd like a way to draw blood decals that are opaque, but using the actor's blood colour as a translation instead. Will most likely have to end up creating a new DECALDEF keyword, probably just called OpaqueBlood or something. So what I am curious about is not actually the original 2001 feature - I honestly don't even care about that anymore. I am asking on how do I get translations on the decal to work render-side.

[Graf Zahl]

I cannot help you with this "feature", because nothing of it exists. It's just a leftover definition with nothing backing it.

[Gez]

I guess it was already dead in 2004. Nash, you should feel free to reuse the keyword and give it a purpose.

If I had to guess, I'd suppose the intent was to have the given colors be the two edges of a gradient that the decal would then match, kind of like how fonts work.

[Nash]

Thanks for the info Gez. Yes, that was the other idea I had, to basically complete the feature - my guess was similar to yours with regards to the gradients.

That was why I made questions in this thread. As I said earlier, it appears that there is translation data being assigned to the objects being made so I am unsure why it isn't working.

It's quite confusing as the code is spread everywhere.