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 Post subject: Occlusion tip
PostPosted: Sun Feb 17, 2008 11:43 am 
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Personally, I don't find myself doing much texturing or rendering, however I'm as big a fan of occlusion as the next guy, but one thing that always annoys me is how black everything turns out. I recently read about a guy who hates black occlusion on skin, and I had to agree with him, especially given skins translucent nature. His workflow was to colour his occlusion maps to match what it was applied to. For skin he used reds. Metals he used blues. I really thought that made a lot of sense. Something to think about. ;)

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 Post subject: Re: Occlusion tip
PostPosted: Mon Feb 18, 2008 11:08 am 
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Totally right dude!... Occlusion can really hurt skin shading especially. If you dont mind however I have an alternate way of doing this rather colormapping the occlusion shader.

Rather than multiplying in the occlusion ontop of the render, invert it and use it as a mask for correction. Basically you will then be using the image colours itself rather than black <> grey <> white. Ratotouille has such beautiful shading and colour because partly because one of the artists noticed shading was derived from blacks and they changed it. You get much more vibrant effects with all the benefits of contact. Off course if scummy environments are the go... perhaps stick with the good old multiplier technique. Also a per adjustment saturation reduction is required due to the natural decrease of gamma saturating the image.

Note in the image below the difference in the skin coloured cube. Also transpaent objects can really suffer the old way too, but not as an adjustment.

Peace out...


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 Post subject: Re: Occlusion tip
PostPosted: Mon Feb 18, 2008 1:52 pm 
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That's what I'm talkin 'bout! Nice.

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 Post subject: Re: Occlusion tip
PostPosted: Mon Feb 18, 2008 2:12 pm 
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Hehe...

While we are on the subject of using occlusion , Subsurface scattering fake using occlusion baking is something im gonna throw up soon... something I came up with a little while ago and still do not see anybody using in their bag of tricks. Its quick, its dirty, but it works ok. Ahh isn't occlusion so the best thing since sliced bread!?!

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 Post subject: Re: Occlusion tip
PostPosted: Mon Feb 18, 2008 2:30 pm 
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is it bad that this is turning me on? ;-) I am so going to try this. I use occlusion on EVERYTHING mind you my stuff isnt realistic but I never thought of doing it your way. Yeehaaarrr...new skills! I've missed this.

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 Post subject: Re: Occlusion tip
PostPosted: Mon Feb 18, 2008 4:37 pm 
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hell yeah quicky and dirty tricks always turn me on!! - lol - jokes aside... thats what its all about! I should really pdf things like this because cause after a while i'll forget a trick here and there - and it risks being lost forever :(

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 Post subject: Re: Occlusion tip
PostPosted: Mon Feb 25, 2008 7:41 pm 
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I like this idea. I can say that I will definitly be trying this out soon

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 Post subject: Re: Occlusion tip
PostPosted: Thu Aug 07, 2008 3:05 am 
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I might completely be in the wrong here but can't you achieve the same/similar effect by changing the blending mode to Overlay instead of Multiply?


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 Post subject: Re: Occlusion tip
PostPosted: Thu Aug 07, 2008 4:42 am 
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Unfortunately no. Overlay works a bit differently. Darks get darker, Mids have no effect, Lights get brighter. Overlay will therefore brighten most of your scene, except for when things are grey , and darken past any point below that.

My favourite use for overlay is to use it for noise layers - where if I fill an empty layer with 128 grey and add my choice of noise. I am free to process the noise as I wish and i like the look it gives.

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 Post subject: Re: Occlusion tip
PostPosted: Wed Aug 13, 2008 11:30 am 
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this is realy nice. real easy to do in nuke. we looking at incorperating this into our comp pipeline :D

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 Post subject: Re: Occlusion tip
PostPosted: Wed Aug 13, 2008 8:01 pm 
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bushpig wrote:
this is realy nice. real easy to do in nuke. we looking at incorperating this into our comp pipeline :D

Good on ya! :mrgreen:

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 Post subject: Re: Occlusion tip
PostPosted: Sat Dec 20, 2008 11:56 am 
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bushpig wrote:
this is realy nice. real easy to do in nuke. we looking at incorperating this into our comp pipeline :D


Just a guess here....Jeremy??

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 Post subject: Re: Occlusion tip
PostPosted: Tue Dec 23, 2008 8:54 pm 
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wow will definitely try this

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 Post subject: Re: Occlusion tip
PostPosted: Sat Dec 27, 2008 10:44 am 
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can this be incorporated in after effects? as i tried and failed can anyone show me how?


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 Post subject: Re: Occlusion tip
PostPosted: Sun Dec 28, 2008 12:59 am 
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Won't show ya but I can tell ya. Drop the occlusion effect above an adjustment layer containing a curves down and a desat. Set the adjustment layer's "track matte " to use inverted lumi.

This will basically use the occlusion passes luminosity as a mask, and inversion will limit the adjustments to only have affect where the occlusion exists rather everywhere but.

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