The mirrored camera is the best choice because you can maintain a true pass system in the reflection(you will have diffuse, gi, etc.) , which you can't do otherwise.
If you are feeling adventurous, you could try projecting a velocity pass on your geo, from a previous render, and then rendering the reflection. Your vertical vector will be inverted, but that's easy to fix in comp. Personally, I would stick to motion blur in camera. Lazy, I know. Ryan On Sep 28, 2013 2:50 AM, "matt estela" <[email protected]> wrote: > I'm no v-ray expert either, but knowing that vray can be treated as a pure > path-tracer like arnold, and getting motion blurred reflections from a > pathtracer is down to spreading your reflection samples over time, I'm sure > v-ray could do this happily, albeit slowly. Did a quick google, found some > images that imply it can do it fine: > > http://www.cg-blog.com/index.php/2013/04/11/vray-motion-blur.htm > > (the first overly-streaky motion blurred image, you can see matching > streaked reflections on the floor). > > You might have misremembered in terms of exporting motion vectors and > applying blur in comp, in which case yes, there's no easy way to capture > that in the render, and you'd need to do the cheats you've described. > > Another way would be to take your render camera, duplicate it, mirror it > on the ground axis, render your reflections through that second > 'reflection' camera. That way you could still export motion vectors, and > keep it all in comp. Depends how clever you wanna be, vs just brute force > render your way though it, which is becoming the norm these days. > > > > > On 28 September 2013 16:18, adam jones <[email protected]> wrote: > >> Hey hey >> >> I ask this question with the feeling I might have over looked some thing. >> >> I know this is not a vRay forum but I just want to give you the complete >> story >> >> Ok am about to commence comp work on a TVC I have a mechanical object >> moving across a mirror like ground surface, this object will have various >> types / directions of MB going on some from its direction of movement but >> also spinning wheels and cog with MB. >> >> Now from what I remember (might be different in newer version of the vRay >> render) the MB is a vary post task being that it will not be shown in the >> reflections on the ground. >> >> I have a couple of ideas of how to get this MB into the ground >> reflections but they don't feel to elegant. >> >> one thought I had was…. >> >> there use to be a gizmo floating around that you could cast ground >> shadows with a projection camera, I just can't remember if it required I >> piece of geo or and alpha to do it, does an you remember this gizmo. >> >> also if any one has some ideas and or pointer that would be cool. >> >> keeping in mind that the ground surface will need to produce some what of >> a clean reflection. >> >> thank you all >> >> -adam_______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >
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