Hello I have a little an issue with motion blur quality in vray 3.0 using the physical camera. 1) i can’t find the “subdivisions” setting. the are not (as suggested by the help file) in the vray camera rendering settigns, nor in the camera settings itself. 2) the quality is controlled by the imag…

It’s not the shading rate that’ll sort out the smoothness of the motrion blur, it’s more your max AA settings. If you pop in to the adaptive subdivision settings which are min -1, max 2, it’s the max AA setting which you want to look at.

Now I have a different issue: alpha chanel is pitch black… where the glitch in my logic? thx for any hint.

See if you can use the colour picker on pixels that are filled in the rgb - it might just be very weak.

yes they are very weak, which is completely useless.

Right - what do you intend to do with this in the end? For something like a light trail, you can just additively blend this over any bit of footage and it’ll be nice and bright. The alpha will likely always be weak since you’ve a very small object that only takes up a small amount of screen space fo…

yes - exactly thats my intention. but the object has a vray light shader assigned. therefore its pretty bright in the buffer (intensities from 1 to 90 tested). It seems that the alpha ignores the RBG values, which is logical but confusing a little… so I’d have to compute the alpha based on RBG in po…

render in passes, ignore alphas & use additive blending modes.

Yeah indeed. What’s happening is that you’ve got a white alpha for a solid object, but if your white alpha is only appearing in part of the frame for maybe a tenth of the motion blur duration for the entire frame, it doesn’t have enough time to “build up” into solid white, and you end up with a ten…

coming back to the original question. is there really no option other than raising the max aa setting? in an animation you are wasting a lot of render time on frames which happen to have not so much motion, right?

vray 3.0 motion blur

V-Ray V-Ray for 3ds Max Issues

vlado April 3, 2014, 12:25am 19

No, you are not wasting anything. The moblur subdivs did exactly the same thing as raising the AA samples.

Best regards,
Vlado

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vray 3.0 motion blur

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