Filter Forge - Hard Shadows by jitspoe

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Sphinx.

Filter Optimizer

Posts: 1344
Filters: 38

Hard Shadows by jitspoe
http://www.filterforge.com/filters/9464.html

Njyldgarkn sample cache!

Posted: March 9, 2011 5:24 am

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Sphinx.

Filter Optimizer

Posts: 1344
Filters: 38

Finally in!

This filter is much welcome - I will return with further comments when I understand what the heck is going on in there - good work!

Njyldgarkn sample cache!

Posted: March 9, 2011 5:25 am

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jitspoe

Posts: 187
Filters: 27

Thanks. It's pretty simple. I just do a dot product with the normal for basic lighting (made a separate snippet for HDR normal maps for those who just care about that) and walk along a ray from each sample toward the light source and check if the heightmap is ever higher than that ray. If so, value = 0. Multiply blend the result with whatever your surface color is, then throw the whole thing into FF's lighting with a lot of ambient light to get the ambient occlusion.

Posted: March 9, 2011 9:51 am

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jffe

Posts: 2761
Filters: 88

Variation #1 looks pretty realistic, and variation 6 reminds me of some old filters I was making a year or two ago, making *fake* shadows for a 3-D look without using the HDR lighting mode. Cool stuff. smile:)

jffe

Filter Forger

Posted: March 9, 2011 11:22 am

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Betis

The Blacksmith

Posts: 1100
Filters: 73

This combined with the new Satellite Image filter could do wonders.

Roses are #FF0000
Violets are #0000FF
All my base are belong to you.

Posted: March 10, 2011 8:29 pm

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jitspoe

Posts: 187
Filters: 27

Sure, why not? Too bad it takes like an hour to render, and the mountains are a bit rough, so the shadows are all spiked. I'm tempted to make a shadow-friendly satellite filter now. smile:)

Posted: March 11, 2011 2:06 am

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jitspoe

Posts: 187
Filters: 27

Did another test with some slight blur - looks better and renders faster, too!

Posted: March 11, 2011 2:08 am

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Betis

The Blacksmith

Posts: 1100
Filters: 73

are you rendering it on top of the diffuse map or the already surface-lit product of the satellite? But I can see that it doesn't look as great as I had imagined. Try a more "solid" terrain? Wait I can do this, why am I ordering you to haha

Roses are #FF0000
Violets are #0000FF
All my base are belong to you.

Posted: March 11, 2011 5:42 pm

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jitspoe

Posts: 187
Filters: 27

More solid like this?

I think there's just too much noise in the trees for this to work well. It wasn't designed with shadow casting in mind.

Posted: March 12, 2011 1:04 am

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Betis

The Blacksmith

Posts: 1100
Filters: 73

it's a little hard to tell where the shadows are but when you look closely it actually looks pretty good. smile:)

btw you inspired me to create your anti-filter, ambient occlusion

Roses are #FF0000
Violets are #0000FF
All my base are belong to you.

Posted: March 12, 2011 1:13 am

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jitspoe

Posts: 187
Filters: 27

I dropped the heightmap down to 25%, and I think it looks a little better - less noisy, more like trees.

Attached the original w/o shadows for reference.

Posted: March 12, 2011 1:15 am

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jitspoe

Posts: 187
Filters: 27

Aww, thought editing would allow me to attach 2 images. Here's the lowered heightmap version:

Posted: March 12, 2011 1:17 am

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Betis

The Blacksmith

Posts: 1100
Filters: 73

def better smile8)

Roses are #FF0000
Violets are #0000FF
All my base are belong to you.

Posted: March 12, 2011 1:36 am

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Betis

The Blacksmith

Posts: 1100
Filters: 73

I modified your filter to accept already-AO'd images, color the light source, and control exposure. My ambient occlusion filter is used on the image/height initially, saved then used the result as the image into your filter, using the same height map, where I have your filter generate it's stuff and simply use an add component to combine the two. Pretty good huh? I love Qbert.

Roses are #FF0000
Violets are #0000FF
All my base are belong to you.

Posted: March 12, 2011 2:28 pm

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jitspoe

Posts: 187
Filters: 27

Qbert 3.0? Looks like it's still a little rough around the edges... literally. smile:)

Posted: March 13, 2011 7:42 pm

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Betis

The Blacksmith

Posts: 1100
Filters: 73

Yeah I think that's due to jpeg compression artifacts or something, but then again it gives it a little realistic feeling hehe

Roses are #FF0000
Violets are #0000FF
All my base are belong to you.

Posted: March 13, 2011 10:38 pm

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jitspoe

Posts: 187
Filters: 27

Kind of looks like a giant stack of pool cue chalk. All we need now is radiosity. smile:)

I'm not sure I understand the need to render AO separately. Are you doing that in a different program or something?

Posted: March 14, 2011 12:13 am

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Betis

The Blacksmith

Posts: 1100
Filters: 73

Funny you mention that. I made my own filter to do AO to save render time, but then I combined them because the light math was actually incorrect, and my AO filter was really fast (2 seconds for a full 1080p image). It looks better now and is about 50x more convenient hahaha. I'm working on an "export HDR" filter that clamps all positive values to 0-1. That's the easy part ( x/sqrt(x^2 + 1) ), but I need a formula that will reconvert those numbers into their original HDR values.

Roses are #FF0000
Violets are #0000FF
All my base are belong to you.

Posted: March 14, 2011 12:27 am

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Crapadilla

lvl 52 Filter Weaver and Official "Filter Forge Seer"