Panda3D Forums

by **rdb** » Fri Mar 06, 2009 10:13 am

Hi all,

Aurilliance and me have been working on Volumetric Lighting in Panda. The algorithm we used is based on this one:
http://http.developer.nvidia.com/GPUGem ... _ch13.html
It's at the moment fully integrated into CommonFilters (and thus compatible with shader generator)

Some screenshots: (yes, taken in Panda)

Credit goes to aurilliance for sharing this beautiful shader with us

[size=0]suppress-screenshots[/size]

by **aurilliance** » Fri Mar 06, 2009 10:16 am

Credit goes to pro-rsoft for taking the time to get it working *properly*

.

For everyone's information, I'm throwing together a demo to show off the shader. You should be able to download it here in a few days max (depending on how much study I need to do

).

by **SylHar** » Fri Mar 06, 2009 10:25 am

impressive !

I'm eager to see what can be done with this

by **lethe** » Fri Mar 06, 2009 11:07 am

Sweet, especially that it is in the common filters system:-)

How does it handle the light exiting the view/being just outside the view?

by **rdb** » Fri Mar 06, 2009 11:12 am

Well, right now, the rays disappear once the sun is out of view. We'll need to find a solution for that.

by **birukoff** » Fri Mar 06, 2009 12:16 pm

Amazing! Awesome! Great! Incredible!!!

PS:Does it also include shadows? I need shadows badly...

by **aurilliance** » Fri Mar 06, 2009 12:36 pm

EDIT: My mistake, ignore this info and see below

As of 1.6 I believe there will be shadows in the auto shaders, and this effect is in the auto shaders atm. So yes, it should work with shadows in 1.6.

by **rdb** » Fri Mar 06, 2009 1:00 pm

Hmm, wishful thinking?

I don't think there will be shadows in 1.6.0, unfortunately. Maybe for a later release.

But to answer your question, birukoff, yes, since this is a postprocessing filter (and requires just one additional rendering pass, which is with all objects black, for occlusion) you will be able to use this with *any* kind of shader without any problems.
But this technique doesn't offer shadows itself, you do need a separate shader for that.

by **astelix** » Sat Mar 07, 2009 6:05 am

jaw down here, outstanding teamjob - looks like I can't wait the upcoming Panda birth

by **rdb** » Fri May 01, 2009 12:39 pm

How about correct occlusion on complex objects?

by **astelix** » Fri May 01, 2009 3:04 pm

uber quality
is this achievable with 1.6.x then?

by **rdb** » Sat May 02, 2009 12:39 am

Yep, since 1.6.0. The problem currently is that all reflecting light is also directed away from the sun, so in a bright scene that will get noticeable.
I've already solved this problem with a second occlusion pass (as shown in the screenshot) but it's still very hacky, so I'm looking for a way to cleanly integrate that.

by **radu** » Tue Dec 08, 2009 2:10 pm

In launchpad, Volumetric Lighting is shown as "in progress" and seems to be the last thing to be solved before 1.7.0. Is that true or is this thread outdated?

and yes, I am impatient about 1.7.0

. it should be just around the corner, right?

by **rdb** » Tue Dec 08, 2009 3:37 pm

It's in already since 1.6.0, but I've been meaning to add some extra functionality for a long time now. Never got to doing it though.
But yeah, it's usable already. :-)

by **ditus** » Tue Dec 29, 2009 5:08 am

wohaa , looks pretty nice!!!

by **morgul** » Wed Jun 02, 2010 7:04 pm

Is there a sample, or tutorial for this?

I'd love to start playing with it, but haven't messed with shaders at all with panda yet.

by **croxis** » Wed Jun 02, 2010 11:21 pm

Search for the demomaster thread, it has a couple samples.

by **rdb** » Thu Jun 03, 2010 1:25 am

http://www.panda3d.org/phpbb2/viewtopic ... 6203#36340

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