Jump to content
The Dark Mod Forums

Something wrong with "fit" on decals?


Recommended Posts

Why is blending even necessary? Tiling textures should already be designed to blend seamlessly.

 

The texture-draw in the hardware will "blend" the pixels because the texture has only so many pixels and it selects a "blend" of certain pixels for each pixel on the screen. So if you use a 32x32 pixel texture, you still get a 1024x768 screen drawn.

 

The "blending" happens to certain rules explained here https://en.wikipedia.org/wiki/Texture_filtering

 

The problem with the decal is, that it is not designed to blend seemlessly in the vertical direction. Which means when drawing pixels near the edge, it is wrong for the shader to select pixels from the "other" side of the texture.

 

I'm not sure if there is a way to stop this (my mind is spotty these days), but I think the "clamp" keyword might be what you are looking for.

"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man." -- George Bernard Shaw (1856 - 1950)

 

"Remember: If the game lets you do it, it's not cheating." -- Xarax

Link to comment
Share on other sites

Looking at this:

 

http://www.iddevnet.com/doom3/materials.php

 

"clamp" should be the one that works - so I'm not sure if it is not working, or you maybe did not apply it at the right place or maybe forgot to reload materials? Did you try it in the engine or in DR? (I'm not sure if DR really supports clamp)

 

Btw, "forceOverlays" might be what you are looking for alpha textures for the AI - wasn't there a problem with decals on AI disappearing for certain stages?

"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man." -- George Bernard Shaw (1856 - 1950)

 

"Remember: If the game lets you do it, it's not cheating." -- Xarax

Link to comment
Share on other sites

That's indeed what clamp is for. Quoting from Real-Time Rendering: "This function is useful for avoiding accidentally taking samples from the opposite edge of a texture when bilinear interpolations happens near a texture's edge". But even if we get it working I think it would suffer from the problem that grayman mentioned: you'd only get one repetition of a decal on a 1x4 wall, for example, and the other 3 squares' worth of wall would be filled by straight bands formed by repetition of the edge of the decal. Could you place your clamped decal on square patches and duplicate them to fill the space?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recent Status Updates

    • Ansome

      Finally got my PC back from the shop after my SSD got corrupted a week ago and damaged my motherboard. Scary stuff, but thank goodness it happened right after two months of FM development instead of wiping all my work before I could release it. New SSD, repaired Motherboard and BIOS, and we're ready to start working on my second FM with some added version control in the cloud just to be safe!
      · 0 replies
    • Petike the Taffer  »  DeTeEff

      I've updated the articles for your FMs and your author category at the wiki. Your newer nickname (DeTeEff) now comes first, and the one in parentheses is your older nickname (Fieldmedic). Just to avoid confusing people who played your FMs years ago and remember your older nickname. I've added a wiki article for your latest FM, Who Watches the Watcher?, as part of my current updating efforts. Unless I overlooked something, you have five different FMs so far.
      · 0 replies
    • Petike the Taffer

      I've finally managed to log in to The Dark Mod Wiki. I'm back in the saddle and before the holidays start in full, I'll be adding a few new FM articles and doing other updates. Written in Stone is already done.
      · 4 replies
    • nbohr1more

      TDM 15th Anniversary Contest is now active! Please declare your participation: https://forums.thedarkmod.com/index.php?/topic/22413-the-dark-mod-15th-anniversary-contest-entry-thread/
       
      · 0 replies
    • JackFarmer

      @TheUnbeholden
      You cannot receive PMs. Could you please be so kind and check your mailbox if it is full (or maybe you switched off the function)?
      · 1 reply
×
×
  • Create New...