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Sweenie · DeleD PRO user Joined: 05 May 2006 Posts: 14

Do you have any plans on adding Ambient Occlusion to the lightmapper?
It's a great way to give the scene/level a more "realistic" look.
Quiet easy to implement aswell, alot easier than radiosity anyway. Wink

Combined with a directional light you can get awesome looking outdoor scenery(it looks great for indoors as well).

I'm sure you know all about it but I'll provide some links anyway. Smile

And by the way, great product you have here.
It's the best tool I bought for a long time.

http://www-viz.tamu.edu/students/bmoyer/617/ambocc/
http://en.wikipedia.org/wiki/Ambient_occlusion
http://www.cs.unc.edu/~coombe/research/ao/

Paul-Jan · Posted: Sat May 06, 2006 9:37 am Post subject:

Hi Sweenie,

Welcome to these forums, and thanks a lot for that very informative post.

The plans are to implement at least some form of (semi-)global illumination into the lightmapper in the future, and ambient occlusion is a good candidate indeed, because it is relatively simple to implement and offers good quality lighting (even though it isn't truely global). Performance is probably not too good, but as the lightmap is relatively low-resolution (compared to raytracing every pixel of an image), that might not be much of an issue.

Ideas like this one are more than welcome, please keep 'm coming Very Happy

.

Sweenie · DeleD PRO user Joined: 05 May 2006 Posts: 14

The last weeks I've been obsessed with ambient occlusion and gave a go at trying to make a lightmapper with ao support myself.

I'm fairly satisfied with the results so far and just wanted to show what a "Deled model" looks like with ao applied.

It produces alot of artifacts, but it's still in an early stage.

This model only has the lightmap texture applied.
It's dark because it's supposed to be a nighttime scene.

Jeroen · Posted: Tue Jun 27, 2006 12:38 pm Post subject:

Thanks for the pic! It really shows what is possible with ambient occlusion. Great stuff! Very Happy

Paul-Jan · Posted: Tue Jun 27, 2006 6:02 pm Post subject:

Looks like an excellent job to me! Very Happy

I have done some early experiments with AO myself in the past, and I must say these results of yours look amazing (I remember having a lot more visible artifacts than I can see in this picture). What are your rendering times?

Care to share your code at some point, or would you rather keep the implementation to yourself?

Daaark · Posted: Tue Jun 27, 2006 8:47 pm Post subject:

That looks awesome.

I don't see any artifacts? Only small things where they are expected because the author of that map didn't delete the hidden surfaces. You make that house look very soft, even though it's hard and all 90 degree edges almost. I would like to see this thing with rounded objects.

1 more time, that looks awesome.
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Mr.Fletcher · Posted: Tue Jun 27, 2006 9:31 pm Post subject:

Very nice

I would like to see that blended together with textures!
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Sweenie · DeleD PRO user Joined: 05 May 2006 Posts: 14

Thanks for you comments Very Happy

Regarding rendertimes...
I never timed the rendering of the cottage but I did some new renders instead...

1 directional light and AO with 32 samples, took 41 seconds

---> lightmap

1 directional light and AO with 32 samples, took 113 seconds

---> lightmap

Rendered using a p4 3.2Ghz with 1gb ram.

The AO code is very unoptimized though so I expect greater performance after some optimizations. Currently I'm doing a couple of Crossproducts, several calls to sinf and cosf and two squareroots(ouch!)...

Regarding sourcecode...
I will gladly share all of my sourcecode, just need to clean it up a bit first...
I'm a messy housekeeper... Wink

Regarding textured model...
Until now I wasn't preserving materalinfo when importing the mesh, but I will implement that any day now...

Nocturn · DeleD PRO user Joined: 08 Aug 2004 Posts: 635

Hi there Sweenie,

These Shots really looking good. Liked always Ambient Occlusion. It gives the Levels / Models a much more Softer & Realistic Look. Thanks for sharing with us Wink

...btw i'm a messy housekeeper too (;

Sweenie · DeleD PRO user Joined: 05 May 2006 Posts: 14

Here is one more...

the warehouse model...

Took 250 secs with AO only.
23280 vertices and 12714 triangles.
approx. 786000 pixels to render x 32 = about 25 million raycasts.
about 0.01 ms per ray.

This model should have been split into several lightmaps though...

the shots...
http://www.svenberra.net/whouse1.jpg
http://www.svenberra.net/whouse2.jpg
http://www.svenberra.net/whouse3.jpg
http://www.svenberra.net/whouse4.jpg
http://www.svenberra.net/whousemap.jpg

Sadly though, "naughty" geometry like T-junctions and overlapping faces really become quite visible.
However, when combined with a texture it becomes less visible.

Also note that the blurpass is to be updated.
Currently I'm just doing an ordinary averaging of neighbour pixels, but I think a gaussian blur(or better yet a selective gaussian blur) would make it look better.

I'm also working on a method to smudge the seams between the texturecharts...

Mr.Fletcher · Posted: Wed Jun 28, 2006 9:27 am Post subject:

...this looks soo great Very Happy

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