Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: danio1011 on 2017-11-29, 09:35:23
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Hello - I've recently started to use lights + motion blur to generate headlight streaks (archviz) in the occasional render. Unfortunately I'm finding it a little unpredictable when it comes to results. With keyframed lights that should blur past the camera I often get no result at all (black VFB). I have to turn on and off motion blur, start and stop the render, move the keyframe around, and then 'bam' it renders as it should. Then I move the keyframe slider or some other minor variable and the lights disappear altogether (i'm rendering them isolated with a direct viz override of black, so I can composite the beauty pass right on my base render.) If I change the value back to where it was, they still are gone. It then takes more fiddling to get it to reappear. It really seems a little random.
Any ideas? Would love to use this technique more in the future, it's just not proving reliable. Probably user error.
Thanks!
Daniel
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Sounds more like a bug. Can you provide more info? Is this happens with interactive or with regular rendering? Couls you recplicate that in simple scene and attach it for devs to look at?
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A general note, not sure if it applies here: if those lights and their streaks are small (a few pixels and less) it might be that it's just the sampling not picking them up and you need to wait longer. I had a scene where I needed this and ended up rendering elsewhere. Raytracers like Vray/mental ray will produce better results, as strange as it sounds.
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Thanks both. Yes I have a stripped down scene I can send. And I also get different results (sometimes) between IR and final. It may be what you're saying, just need to wait longer. But I have given it some time and not seen anything show up. I tried UHD vs Path and also tried disabling the new light solver. I probably should do the streaks in PS but these look so nice...
Anyway, I'll send the scene tonight.