Return-Path: Received: from mail-yw0-f41.google.com ([209.85.213.41] verified) by media-motion.tv (CommuniGate Pro SMTP 4.2.10) with ESMTP-TLS id 4804555 for AE-List@media-motion.tv; Wed, 08 Aug 2012 04:10:18 +0200 Received: by yhr47 with SMTP id 47so278603yhr.28 for ; Tue, 07 Aug 2012 19:10:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=3N4+LOtb0j8tu6yhz+yNsmsBLEvkljjnTgie3dPUM4k=; b=wo2AjvH8QkHlNuGY/6elkZ33Zpd0NImjkVw8JFmH/1jFZDnIpqaQvFHasWXLn7lRuv AyfyeOJ21iLy7sIvS63o9LFFbygaSw4qAOcWIHaAMppl5xso7RArjWC7CB77dXQNtz8t 0/u6qPzA7/C+r/ZOSgt8mBmaqWsxfRD0pN8iKN+tPaYSsunMmDSVm07eubiF6fV+NduG rjdkC7VGBSVaA92rlZqogNbgyvJB/bRNs24xe7W6sfbOyCSJZi24fRSmx6mN/U+AhY/w duItbWDH9O9iimRBWaLJocIJUhJZj4+QxShZhUJSdCvK0b+zR4o6OAiGMNBwYlHf1jSL grSw== MIME-Version: 1.0 Received: by 10.50.159.196 with SMTP id xe4mr405461igb.43.1344391824751; Tue, 07 Aug 2012 19:10:24 -0700 (PDT) Received: by 10.64.165.228 with HTTP; Tue, 7 Aug 2012 19:10:24 -0700 (PDT) Received: by 10.64.165.228 with HTTP; Tue, 7 Aug 2012 19:10:24 -0700 (PDT) In-Reply-To: References: Date: Tue, 7 Aug 2012 19:10:24 -0700 Message-ID: Subject: Re: [AE] Compositing 3D render passes in AE From: Darby Edelen To: After Effects Mail List Content-Type: multipart/alternative; boundary=14dae934059b273b8a04c6b79da8 --14dae934059b273b8a04c6b79da8 Content-Type: text/plain; charset=ISO-8859-1 AE will simply convert the image to 8bpc (introducing some diffusion noise) and clip values outside of the 0-1 range. This can cause some differences in the render. I've especially noticed problems in saturated superbrights. I recommend adding an adjustment layer at the top of your render comp. Make it a guide layer and add a Levels effect with the clip white and black options both 'on.' This should give you a preview of how the clipped render will look. You can make adjustments under this layer to adjust for the conversion. On Aug 7, 2012 3:31 PM, "Teddy Gage" wrote: > ah no, it's output from mental ray. Not clamped, full 32 bit. but that did > start me thinking. I realized the gamma for the blended passes was probably > the issue - set it to 2.2 and now it looks good. > > This brings up another question though - when rendering from a 32bit > project to an 8bit h264, how does AE tonemap the values? Does it tonemap? > is there a way to change this, or a filter to use? > > On Tue, Aug 7, 2012 at 5:03 PM, Greg Balint wrote: > >> What program are you rendering from? C4d? >> >> Are your luminance values clamped at 1.0 in the EXRs or do they go much >> higher? >> >> >> If they are clamped, I've read you need to disable straight alpha in your >> render if you're using C4D, to get what you need. >> >> I've done nothing like this before, so this answer is purely off of some >> quick research and googling. If it doesn't make sense, it's because of >> that. >> >> ///Greg Balint >> //Art Director / Motion Graphics Designer >> /321.514.4839 >> delRAZOR.com >> >> On Tuesday, August 7, 2012 at 4:31 PM, Teddy Gage wrote: >> >> Hello, I am working on a project with some rendered realflow fluid >> sims, and I'm at the final stages. I have my multilayer EXRs imported as >> layers, and I'm trying to reconstruct the beauty pass from spec, refract, >> reflect, shadow, diffuse, AO, vector, motion blur and indirect passes. >> (output from Mental Ray) I am getting pretty close by using add modes on >> spec, refract, and reflect, and then multiplying the shadow pass, but when >> recomped with the background it is way off, and especially once I add >> ambient occlusion. It looks extremely burned out. I am in a 32bit project. >> I haven't found any tutorials that are too good about how to layer and >> blend these passes in AE. Usually I would do this in Toxik / Composite or >> Nuke, but I prefer AE's layer and keyframe handling better. Especially >> because I'm going to strip each layer away for a demo animation. Anyone >> have ideas or can point me to a good tutorial? Thanks, >> TG >> >> -- >> Animator & Editor >> www.teddygage.com >> Brooklyn >> >> >> > > > -- > Animator & Editor > www.teddygage.com > Brooklyn > > --14dae934059b273b8a04c6b79da8 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

AE will simply convert the image to 8bpc (introducing some diffusion noi= se) and clip values outside of the 0-1 range.

This can cause some differences in the render.=A0 I've especially no= ticed problems in saturated superbrights.

I recommend adding an adjustment layer at the top of your render comp.= =A0 Make it a guide layer and add a Levels effect with the clip white and b= lack options both 'on.' This should give you a preview of how the c= lipped render will look. You can make adjustments under this layer to adjus= t for the conversion.

On Aug 7, 2012 3:31 PM, "Teddy Gage" &= lt;teddygage@gmail.com> wrote= :
ah no, it's output from mental ray. Not clamped, full 32 bit. but that = did start me thinking. I realized the gamma for the blended passes was prob= ably the issue - set it to 2.2 and now it looks good.

This brings up= another question though - when rendering from a 32bit project to an 8bit h= 264, how does AE tonemap the values? Does it tonemap? is there a way to cha= nge this, or a filter to use?

On Tue, Aug 7, 2012 at 5:03 PM, Greg Balint = <greg@delrazor.com> wrote:
What program are you rendering from? C4d?

Are your luminance values clamped at 1.0 in t= he EXRs or do they go much higher?


= If they are clamped, I've read you need to disable straight alpha in yo= ur render if you're using C4D, to get what you need.

I've done nothing like this before, so this answer = is purely off of some quick research and googling. =A0If it doesn't mak= e sense, it's because of that.=A0

///Greg Balint
//Art Director / Motion Graphics = Designer
/321.514.4839
delRAZOR.com

=
=20

On Tuesday, August 7, 2012 at 4:31 PM, Teddy= Gage wrote:

=A0=A0 Hello, I am working on a project with some rendere= d realflow fluid sims, and I'm at the final stages. I have my multilaye= r EXRs imported as layers, and I'm trying to reconstruct the beauty pas= s from spec, refract, reflect, shadow, diffuse, AO, vector, motion blur and= indirect passes. (output from Mental Ray) I am getting pretty close by usi= ng add modes on spec, refract, and reflect, and then multiplying the shadow= pass, but when recomped with the background it is way off, and especially = once I add ambient occlusion. It looks extremely burned out. I am in a 32bi= t project. I haven't found any tutorials that are too good about how to= layer and blend these passes in AE. Usually I would do this in Toxik / Com= posite or Nuke, but I prefer AE's layer and keyframe handling better. E= specially because I'm going to strip each layer away for a demo animati= on. Anyone have ideas or can point me to a good tutorial? Thanks,
TG

--
Animator & Editor
= www.teddygage.com
Brooklyn

=20 =20 =20 =20
=20




--
Animator & Editor
www.teddygage.com
Brooklyn

--14dae934059b273b8a04c6b79da8--