PDA

View Full Version : Video Tutorial: RSMB compatible motion vector buffer from LW using DP Filter



dwburman
10-24-2012, 03:56 PM
I just posted a video showing my experimental set up for getting a Motion Vector pass out of LightWave that will work with the ReelSmart Motion Blur plugin. I don't know if it is 100% correct, but it seems to be giving me useable results... at least in my simple test scene.

This uses the DP Filter plugin (Thanks, Denis!) to combine LW motion vectors into one color buffer.


http://youtu.be/vUX6F7-BQnA
http://youtu.be/vUX6F7-BQnA

Links:
http://dpont.pagesperso-orange.fr/plugins/nodes/DP_Filter.html
http://www.revisionfx.com/products/rsmb/

RebelHill
10-25-2012, 01:01 AM
I'll def give this a pop at some point on a project in my pipe. Ive still been using the ol MotionVecotrs0.4 plugin to do this... so it'll be good to compare.

Cheers.

djwaterman
10-25-2012, 02:54 AM
Will it work on a rotating wheel?

dwburman
10-25-2012, 01:50 PM
I hope it works out. There seemed to be a lot of stuff in the RSMB and other LW plugin documentations that I sort of ignored. I'm guessing that anything I missed is just in the conforming or mapping of values to what RSMB wants since I'm just working with the motion buffers that LW gives. :)

Here's a test for rotations: http://www.youtube.com/watch?v=VrCWM4jWSic

It's not perfect. Maybe adding a few motion blur passes in the render will help shape the blur better.

Cageman
10-25-2012, 04:11 PM
I have an exrTrader preset that generates RSMB-compatible mblurvectors. :)

Celshader
10-25-2012, 05:40 PM
If the wheel rotates slowly enough, sure. I learned last week that RSMB Pro Vectors does more than a straight vector blur -- it actually seems to analyze the frames before and after the current frame and curves its post-process motion blur.

I doubt it will work on fast-spinning wheels, propellers and helicopter blades, though.

lardbros
11-06-2012, 06:01 AM
Thanks for the video... I have followed it (and all your other vids... thanks for those too), but this doesn't appear to work on my own demo scene, that definitely worked using the plugin here http://www.richardnichols.net/rsmbexport/


Anyone know if the above nodes should work in all situations? I will post my demo scene when I get back home... see if anyone else can get it to work using the above nodes. I may well have missed one little setting, but followed it carefully.

- - - Updated - - -


I have an exrTrader preset that generates RSMB-compatible mblurvectors. :)

I have EXR trader... any chance you could possibly share? :D

lertola2
11-07-2012, 12:02 PM
It is not working for me either. You can see what is happening in the attached image. The left is Lightwave's photo real motion blur. The middle image uses Real Smart Motion Blur in After Effects which looks good but has some artifacts. Avoiding these artifacts is the reason I am very eager to find a way to use motion vectors to produce motion blur. The right image shows the results of using dwburman's setup. The blurring looks like it is working for the foreground objects but the blurring on the farther objects does not look like it is related to their direction of motion. I have tried saving the motion vector file in different formats and played with different color space settings but that seemed to make no difference. I would love to find a solution for this (that works on a Mac).

-Joe

dwburman
11-07-2012, 09:20 PM
I was hoping this technique would work, but it may indeed need some improvement.

@lardbros I take it the result doesn't match the plugin. Do you have any images?

@lertola Can you tell if this is a problem with the output, LW's vector buffer, or perhaps just a limitation of trying to do motion blur in post? I'm looking at this on my phone and I can't see the pic you posted.

erikals
11-08-2012, 02:04 AM
might wanna check gerardo's trick too... > http://forums.newtek.com/showthread.php?71751-Extra-Buffer-nodes&p=1268096&viewfull=1#post1268096