Ambient Occlusion Demo

BlindSide · Post by **BlindSide** » Wed Nov 26, 2008 3:19 am

XEffects renders the depth map for you correctly (By transforming the vertices first, as you are supposed to do), and provides a screen quad post processing interface. Take a look if you are interested.

dlangdev · Post by **dlangdev** » Wed Nov 26, 2008 5:46 pm

Thanks Blindside, I did add the XEffects code in there and will start playing around with. Though I still need that additional front-pass integrated into the processing pipeline.

I have two screen rtts (1024x768) going on in there and surprisingly the FPS went up to 120.

Here's the screenshot showing XEffects in the postprocess.

512x512 screen rtt

1024x768 screen rtt

No Post Process

dlangdev · Post by **dlangdev** » Wed Nov 26, 2008 7:53 pm

dlangdev, speed up Blender's AO by changing it to approximate. It wont look quite as good, but its ALOT faster, (because you dont need raytrace turned on)and it will blend with a realtime AO'd objects better

Wow, that was nice, I had no idea there's another Occlusion tab hiding in there (Blender248). So I played around with approximate then went back to default tweaking the settings.

Definitely, I learned a lot from there and probably found the sweet spot for my taste.

Thanks a lot, oldSkool...that was nice.

dlangdev · Post by **dlangdev** » Thu Nov 27, 2008 6:43 pm

Here is the depthmap pass in SSAO1...

and here is the adjusted color...

dlangdev · Post by **dlangdev** » Thu Nov 27, 2008 7:23 pm

dlangdev · Post by **dlangdev** » Fri Nov 28, 2008 7:21 am

Blindside, need your help here.

I got the normal saved in the gl_fragcolor as well. My intention is to render another color value using the normal. But the actual occlusion variable will be implemented using the ray-hemisphere method. I can only do that by sampling the normals and figuring out the occluders and escapers.

Can you post your comments, I need them badly. Thanks.

By the way, here is the screenshot of the 'bent' normal blended with depth. That's for show only, tho.

Ref:

http://www.gamedev.net/community/forums ... _id=469124

http://delivery.acm.org/10.1145/1290000 ... EN=6184618

http://www.gamedev.net/community/forums ... _id=420469

http://perumaal.googlepages.com/

ftp://ftp.research.microsoft.com/pub/tr/TR-2006-81.pdf

BlindSide · Post by **BlindSide** » Fri Nov 28, 2008 10:11 pm

You're on your own mate, I haven't looked into bent normals or ambient aperture lighting yet.

dlangdev · Post by **dlangdev** » Sat Nov 29, 2008 12:18 pm

Thanks much for the help, really appreciate it. XEffects worked wonders and it pushed me farther up. So yeah, it's definitely cool.

I'm going to stop doing more research and coding and just focus on setting-up the next demo. I'm thinking of setting up a sample scene similar to Gears of War and put some of what I learned in there.

Screenshots shown below. I'll will mainly setup the ambient map first and focus on the diffuse and specular maps later.

dlangdev · Post by **dlangdev** » Sat Nov 29, 2008 10:42 pm

oldSkool: Quick question, I know you use Blender and would like to know how you setup a scene. Mine, I create the scene in Blender and export it to B3D. I'm wondering if there's any other way of doing it.

I'm interested in your comment.

Thanks.

BTW, here's the new sample scene made in Blender...

Halifax · Post by **Halifax** » Sat Nov 29, 2008 10:56 pm

I like the look of that test level dlangdev, it looks very professional. I can't wait until you get it textured.

oldskoolPunk · Post by **oldskoolPunk** » Sun Nov 30, 2008 2:10 am

yep b3d just like you

I bake color, shadow, and AO separately so I can work post on them, then blend them together in Gimp.

Here is a scene with only one texture. (color+AO + shadow). Notice to try to get the nice, prerendered lighting and shadows to match the fast ugly realtime lighting and shadows of the ball.

Very nice AO on your level there!
I can still see the speckles tho !

dlangdev · Post by **dlangdev** » Mon Dec 01, 2008 1:43 am

Interesting stuff.

Thanks for the comment, I'll try that later.

I'm still working on setting-up the next test demo.

Eigen · Post by **Eigen** » Mon Dec 01, 2008 6:11 am

This is looking great! There's definitely an progress with your results from when you started. I mean, dang it .. !

Mel · Post by **Mel** » Mon Dec 01, 2008 4:30 pm

The ambient occlusion works miracles when correctly applied!

After it is mixed with the specular and diffuse, it should have an impressive looking!

dlangdev · Post by **dlangdev** » Mon Dec 01, 2008 6:42 pm

Thanks guys. I'm almost done modeling the scene and will switch to diffuse and specular textures next. I found one interesting tutorial that will help me, link shown below.

http://www.moddb.com/tutorials/building ... -photoshop

Basically, what I'm trying to do is learn how the textures in Gears of War were created.