Vray Velocity Pass not recognizing opacity

[gkolln]

I have seen a few posts in the past about this issue but I couldn't get a clear idea of whether this is supposed to work or not.

We have some trees with opacity mapped leaves on basic poly's and we move quite close to them in an animation.

Does anyone know if the Vray velocity pass supposed to recognize the opacity map? I have also tried in refraction and this doesn't work either.

We are using Max 2011 & Vray 2.20.03.

[jacksc02]

have you got the "all channels" selected in the "affect channels" pulldown in the material of the leaves?

[vlado]

It looks like it's not working for the moment; it's something that we have to fix. A quick solution would be to use the water-level feature of the VRayDisplacementMod modifier.

Best regards,
Vlado

[gkolln]

Yes we did have all channels selected.

Thanks Vlado. Let me know when it is fixed.

[PEgaz]

hi
Any solution to that issue? (MAX2012/Vray 2.20.03)
I just need velocity pass to ReelSmart Mblur and I have leaves of a tree flying quite near the camera - and it's more than noticably that mblur picks whole geometry of a leaf for the effect

regards
PEgaz

[3LP]

We had that same issue last week.
We had to use normal RSMB to solve the problem on the frames where we had the problem.

Hope it's gonna be fixed
Stan

[Morbid Angel]

I know its not a solution, but could not just render them with 3d motion blur?

[miguelortega]

the problem with the "transparency" slowdown in vray is either way youre screwed because
1. its slow as hell to render transparency/ opacity
2. since its slow as hell without Motion Blur, rendering it WITH motion blur is not even an option. my render times with transparency goes from 1 1/2 hours to 14 hours a frame.
3. so the next solution is veloctiy blurs but these dont work either...leaving us screwed on every front.

[Morbid Angel]

are you rendering trees? In any case, I think there could be an issue with filtering/opacity. I am in the process of doing a forest render in maya, and the rendering there is fine, with motion blur at 2k I get 3-4 hours per frame for a good half of the frame filled with forest (motion blurred).

Could you post maybe an example scene that people can look at?

[miguelortega]

thanks for the reply dmitry, what are your filtering settings?
are u using adaptive subdivision or adaptive dmc ?
what are your min max settings?

thanks man

[Morbid Angel]

Im rendering a setup test right now which I can show later. Basically I have two sided materials on the leafs, where all the bitmap blur is set to 0.01 in the alpha (of the leaf). This appears to speed up the rendering, I am also using vray hdr loader with custom filters that it offers though in 3ds max it appears not to make much difference, the main speed difference is bitmap blur. Will show tomorrow.
Dmc sampler is at 3/8 noise .85, 0.005, motion blur subd 24. Render time about 3 hours.

Edit:
I must correct my statement here. With these settings the motion blur is much cleaner then the image below, but takes about 7 hours to render. Image below is rendered with 0,85, 0.01 and subdivs 16 for mb.

[miguelortega]

thanks again man, i have been reading your other posts and you seem to be a lifesaver for many, cheers

[Morbid Angel]

Here is a quick render I did as an example. The settings are the ones I described earlier I had one dir light and a dome light with 64 subdivs, this is a single tree from evermotion tree library instanced some 100 times and camera moving quite fast I would say. You can see there is still grain in the render which can be refined, though the render time will go up. For my actual scene, its between 3-5 hours for a frame like this, thankfully there isn't too many frames like this

[3sgteMKI]

Nevermind!