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Lighting on textures doesn't fade gracefully..
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 Re: Lighting on textures doesn't fade gracefully..
Posted by Warren on Sat Nov 4th at 7:08am 2006

Some images in this post have been automatically down-sized, click on them to view the full sized versions:

Some images in this post have been automatically down-sized, click on them to view the full sized versions:

A minor issue with lighting. I have a large, moderately complex room lit by a variety of low intensity spotlights. The problem I'm having is that textures that are hit by very dim light towards the point where light becomes negligable, become discolored and "blotchy."

You can observe the same thing often in games like Deus Ex, although it might depend on monitor and ingame brightness settings. (I wonder) Here's a couple screenshots of one of the more noticeable instances:

The top screenshot here is unaltered and in the bottom one I boosted the brightness and contrast in Photoshop to illustrate the problem. Where you can see it go blue in the bottom shot is where the problem lies.





I hope the problem is visible in the top shot - it's hard for me to even see a problem myself, but in-game it was very noticeable.

The light fading degradation if I may call it that was more severe before I changed the lightmap scale on all the room's textures to 4, which is what they are set at in these shots.

Is there anything else I can do? Or, is this related to an unusually high brightness setting within HL2 or from my monitor? (That means for other people it should look fine)




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 Re: Lighting on textures doesn't fade gracefully..
Posted by fishy on Sat Nov 4th at 11:30am 2006

the top picture is almost black for me, although the bottom-right corner of it seems to have a little bit of light that evenly fades out to black.


i eat paint



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 Re: Lighting on textures doesn't fade gracefully..
Posted by Orpheus on Sat Nov 4th at 1:29pm 2006

I can see both.. IMO you're a bit premature in your concern. The room/area consists of vacant wall textures. /methinks that once the compiler tools have a bit of useful detail to work with that the light issue will play itself out.

/opinion





The best things in life, aren't things.



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 Re: Lighting on textures doesn't fade gracefully..
Posted by Dark_Kilauea on Sat Nov 4th at 7:30pm 2006

Yes, this is an artifact caused by not enough light on certain textures. You can reduce the effect somewhat by decreasing the light scale. Another technique is to use so called "black lights." Make several lights of low intensity that have a color value of 0,0,0. Cubemaps do not help though.

Usually, this artifact is not a problem due to the final texture being diverse enough that the effect is never noticeable.


Dark_Kilauea
DVS Administration
http://www.dvstudio-production.com/



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 Re: Lighting on textures doesn't fade gracefully..
Posted by reaper47 on Sun Nov 5th at 1:19pm 2006

These effects are almost impossible to avoid. You'll find some dark, ugly spots in professional maps as well. It's RAD not calculating light bounces correctly (every wall reflects a tiny amount of lighting and bounces it around to make shadow areas not so pitch-black [Doom3]).

Adding more or brighter lights might work, but it will also kill the nice contrast between dark and shady spots.

A VRAD compile with "-final" (which takes about 3 times as long) also adds a bit of quality. But the artifacts won't be gone completely.

If you work on your brush-architecture and texturing no-one will blame you for this, probably even won't notice it at all. Be happy with it.

PS: Dark_Kilauea: Black lights? Never heared of that! Interesting! Do they make the room darker?


Why snark works.



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 Re: Lighting on textures doesn't fade gracefully..
Posted by Dark_Kilauea on Sun Nov 5th at 5:59pm 2006

I have yet to use them myself, but apparently, yes they do paint an area darker, but don't use them with high intensities <img src=" SRC="images/smiles/icon_smile.gif">


Dark_Kilauea
DVS Administration
http://www.dvstudio-production.com/



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 Re: Lighting on textures doesn't fade gracefully..
Posted by midkay on Sun Nov 5th at 8:17pm 2006

Just curious - have you got a leak in your map?

I used to have this on one of my maps in a dark room - it was terrible. There was this red and blue weird blotchiness on the walls. I realized I had a leak, fixed it, recompiled and the entire map was much more evenly-lit (vrad calculating radiosity) and as a result of radiosity, the blotches were gone.


-- midkay



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 Re: Lighting on textures doesn't fade gracefully..
Posted by Orpheus on Sun Nov 5th at 8:24pm 2006

*whispers*

Wouldn't it be fullbright and hence no shadows at all?





The best things in life, aren't things.



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 Re: Lighting on textures doesn't fade gracefully..
Posted by midkay on Sun Nov 5th at 8:37pm 2006

*whispers back*

Not at all. Vrad still runs when you have a leak, just "not as well" (doesn't do the whole radiosity bit that takes all of about 2 seconds).


-- midkay



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 Re: Lighting on textures doesn't fade gracefully..
Posted by Orpheus on Sun Nov 5th at 8:54pm 2006

*Whispers, inhales spittle and coughs uncontrollably*

*glares at midkay for causing scene*

I wouldn't know really. I don't create leaks. Have not actually had one since my second or third release.





The best things in life, aren't things.



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 Re: Lighting on textures doesn't fade gracefully..
Posted by Warren on Sun Nov 5th at 10:06pm 2006

Orpheus: the area is almost fully textured. I've used a placeholder texture in the above screenshots because I'm about to build a door and hallway through it. But there's similar artifacts on even the detailed textures.

Dark_Kilauea: I will give that a try.

midkay: no leaks. <img src=" SRC="images/smiles/icon_smile.gif">

Thank you for the help gentlemen.




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 Re: Lighting on textures doesn't fade gracefully..
Posted by midkay on Sun Nov 5th at 10:10pm 2006

*whispers back at Orph*

Ah, fine excuse, fine excuse indeed.


-- midkay




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