DeleD Community Edition

adr · Member Joined: 23 Jul 2005 Posts: 165

lol I hate posting bugs, never know if its a bug or a mishap on the user side=) Any case, I have 2 lights running one acting like a sun and another acting like a light. They both shoot (the light) past walls and under them like in the pics:

http://adr2.50megs.com/lightpast1.jpg
http://adr2.50megs.com/lightpast2.jpg

Mr.Fletcher · Posted: Thu Jan 31, 2008 9:48 am Post subject:

That's not a bug. This happens when the user choses a too small lightmap resolution. You should either make it higher or split up the large polygons into smaller ones.
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Paul-Jan · Posted: Thu Jan 31, 2008 11:12 am Post subject:

To expand on what Mr Fletcher just said, those walls continue onderneath the floor, right? That's kinda 'incorrect' modeling (t-junctions), you should split the wall up it so there is an actual edge where floor and wall meet. There is a nice discussion on the topic going on here

When you get down into details, a lightmap is nothing more than a bunch of texture pixels (texels). The coarser your lightmap, the bigger those pixels. Currently, your floor hits the wall half-way such a pixel (because of the way the geometry is constructed), so the light/darkness of the unseen half of the pixel shiness through.

Grandmaster B · DeleD PRO user Joined: 03 Jul 2007 Posts: 218

I pictures are not working anymore but i think we have the same problem.

I realy LOVE DeleD but the lightmapper is not good enough to be used in production. It has a small bug which lets polygons leak light at some polygon edges.

First a picture of correct lighting:

Now try the other edge:

The leak is always there, no matter how small the lumels are. Heres a picture with a bigger lightmap:

The solution would be to adjust the lightmap uv by one lumel (maybe a half).

The error is easy to reproduce, but heres the scene i used:
http://www.odagames.de/lightmap_error_scene.dxs

elementrix · Posted: Sun Feb 03, 2008 1:50 pm Post subject:

I prevented this by placing a rectangle just outside of the wall that casts shadow...

but ofcourse it would be better if It doesn't occur anymore Smile

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Grandmaster B · DeleD PRO user Joined: 03 Jul 2007 Posts: 218

I wonder if not more people have this problem and do not complain about it because they think its their fault (i first did). Some may of course use "incorrect" geometry decribed above.

Maybe most people do not need and use the lightmapper intensively enough to notice the leak. Do people need the lightmapper?

I personaly wanted to use DeleD levels in my pipeline but this prevented me from doing it.

elementrix · Posted: Sun Feb 03, 2008 2:20 pm Post subject:

I notice it alot, just forgot to ask Laughing

and if you would make a rectangle, that doesn't recieve any lightmap but only casts shadow and you delete it later there is nothing wrong right? untill the bug is fixed you could do it like that...
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Grandmaster B · DeleD PRO user Joined: 03 Jul 2007 Posts: 218

Im not sure if i understand where to place the rectangle but ill try it. Thanks for the hint!

However if you have a rather huge level this is something you cant do practically.

elementrix · Posted: Sun Feb 03, 2008 2:35 pm Post subject:

you can place the rectangle here: (place it very close to the wall, you need to set the snap method to none to get close enough otherwise it will cast some light at the cornor)

also I thought this mayb be caused by the smooth in the lightmap, but even with a lightmap with 0 smooth you still get a white line.
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Grandmaster B · DeleD PRO user Joined: 03 Jul 2007 Posts: 218

Ok, i tried it. When i place a rectangle beside the wall that casts the shadow the leak is gone!

When i delete the actual wall polygon and merge the rectangle with the room object the problem is the same as before. But if the wall exists as seperate object it works.

The easiest way to fix those light leaks seems to "extract" the walls from the rooms.

elementrix · Posted: Sun Feb 03, 2008 2:39 pm Post subject:

also if you don't want the rectangle too get a lightmap (which will cost some lost memory in your lightmaps) you'll have to place another texture on it (like floor02) and then in the material editor you'll have too unselect "enable lightmap" for the texture, but leave "cast shadow" selected.

EDIT:

Grandmaster B · DeleD PRO user Joined: 03 Jul 2007 Posts: 218

I've solved the leak by extracting the polygons below into another object. The shadows are then correct Smile

This may not work in all cases ...

EDIT: "Remove original polygons" can be turned ON.

elementrix · Posted: Sun Feb 03, 2008 2:56 pm Post subject:

I don't know if this has anything to do with it, but a long time ago I also had the same kind of problem with texture's (looks like the uv's aren't placed correct) the texture's here were done by "fit texture size to face" but as you can see the green of the cornors also get's in the middle?

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Grandmaster B · DeleD PRO user Joined: 03 Jul 2007 Posts: 218

This has todo with texture border filtering, this is normal and should be fixed by hand. However the lightmap leak may also related to filtering.

But im not sure because earlier i also made this rendering which seems strange because the leak seems to have "perspective":

I was not able to reproduce it.

Btw. Nice model.

Daaark · Posted: Sun Feb 03, 2008 3:14 pm Post subject: