the source code is on nukepedia as well. cheers, Vincent 2016-10-28 17:14 GMT+02:00 Erwan Leroy <er...@erwanleroy.com>:
> Ah, got to get my hands on that c44matrix so that I can see the result. > Is Ivan still in the mailing list? Any chance to compile a new one? Or is > the source code somewhere? > It's an interesting challenge. > > > On Friday, October 28, 2016, Vincent Langer <m...@vincentlanger.com> > wrote: > >> Hi Erwan, >> >> ah I did not know about cx and cy - good to know- BUT the whole thing is >> for a deep tool and cx and cy do not work in deep expressions. this also >> answers the question I am why not using the DepthToPosition node. >> >> focal length and aperature size is considered by the c44Matrix node in >> projection mode. >> >> cheers, >> Vincent >> >> 2016-10-28 12:33 GMT+02:00 Erwan Leroy <er...@erwanleroy.com>: >> >>> Hi >>> Maybe you are doing it for the challenge, but is there a reason why you >>> would not use the DepthToPosition node built into Nuke? I seems to do >>> exactly what you are trying to do (I get a very small error which I believe >>> is due to rounding). >>> For the fun of it I looked into your expressions, but couldn't go all >>> the way through because there is no current build for the C44Matrix for >>> Nuke 9 on windows. >>> I have 2 things that I believe might be affecting your result (but I >>> can't verify): >>> >>> - I don't see you consider the focal length anywhere? That would have a >>> big impact. >>> >>> - Now this might not apply for every renderer, and Nuke's built in node >>> ignores that point as well: In your first expression, you generate a >>> "default" position point cloud, with X and Y as planar coordinated, while >>> possibly using a "curved" Z_Depth for you Z input. In real world (and Vray >>> for exemple) the distance a of a card right in front of a camera would not >>> have a single value, as the distance on the sides of the frame would be >>> greater than right in front of the camera. >>> See attached pictures that illustrate this point. >>> >>> (Also, for that first expression, why not using cx and cy instead of >>> that complex expression) >>> >>> >>> Cheers >>> >>> *Erwan* LEROY >>> www.erwanleroy.com >>> >>> On Fri, Oct 28, 2016 at 4:04 PM, Vincent Langer <m...@vincentlanger.com> >>> wrote: >>> >>>> Hi there, >>>> >>>> I am trying to get the math right calculating the worldpositions from z >>>> information + camera matrices. >>>> >>>> my result is close to the rendered position pass - but does not line up >>>> perfect. >>>> >>>> Maybe one of the brains out there can tell me what I am missing/doing >>>> wrong >>>> >>>> This is just a proof of concept for the right math and I use the >>>> C44Matrix node from Ivan Busquets. >>>> >>>> cheers, >>>> Vincent >>>> >>>> -- >>>> Vincent Langer >>>> Uhlandstr. 29 >>>> 71634 Ludwigsburg >>>> +49 176 965 177 61 >>>> www.vincentlanger.com >>>> >>>> _______________________________________________ >>>> Nuke-python mailing list >>>> Nuke-python@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python >>>> >>>> >>> >>> _______________________________________________ >>> Nuke-python mailing list >>> Nuke-python@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python >>> >>> >> >> >> -- >> Vincent Langer >> Uhlandstr. 29 >> 71634 Ludwigsburg >> +49 176 965 177 61 >> www.vincentlanger.com >> > > > -- > *Erwan* LEROY > www.erwanleroy.com > > > _______________________________________________ > Nuke-python mailing list > Nuke-python@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python > > -- Vincent Langer Uhlandstr. 29 71634 Ludwigsburg +49 176 965 177 61 www.vincentlanger.com
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