rhlkvr15 Posted January 11, 2013 Share Posted January 11, 2013 good evening forum..... i am rendering an architectural walkthrough and need to add some motion blur to the video.....i tried with VRay Physical Camera but it makes the rendering very slow....does anyone here know how to make motion blur in post production in AE using any pass while rendering......i searched the web for tutorials but didn't got any......please share the link if anybody got the tutorial...... Thank you..... Happy Weekend...... Link to comment Share on other sites More sharing options...
easy3dsource Posted January 11, 2013 Share Posted January 11, 2013 I use Reel Smart Motion Blur, by revision FX. It can create really solid motion blur even without a motion / vector pass: http://www.revisionfx.com/products/rsmb/ Link to comment Share on other sites More sharing options...
rhlkvr15 Posted January 12, 2013 Author Share Posted January 12, 2013 Thank You very much alex for the quick reply.....Very helpful..........but is there any way the velocity pass in 3ds max can be used to create motion blur........ thank you..... Link to comment Share on other sites More sharing options...
Chris MacDonald Posted January 14, 2013 Share Posted January 14, 2013 No, max isn't compositing software. Link to comment Share on other sites More sharing options...
John Dollus Posted January 14, 2013 Share Posted January 14, 2013 The velocity pass rendered out of max is used by reelsmart to determine proper motion blur in whatever post production software you are using (after effects, nuke, fusion etc). Link to comment Share on other sites More sharing options...
rhlkvr15 Posted January 14, 2013 Author Share Posted January 14, 2013 thank you very much for the reply guys...........thank you chris and john........ Link to comment Share on other sites More sharing options...
easy3dsource Posted January 16, 2013 Share Posted January 16, 2013 +1 to what john said. The velocity pass is like any other additional render element (alpha, depth, etc) that provides you with more flexibility in your compositing environment. RSMB can do a motion blur calculation without a velocity pass (it calculates changes in pixels from one frame to the next, or you can provide your velocity pass for a more accurate calculation. Link to comment Share on other sites More sharing options...
rhlkvr15 Posted January 16, 2013 Author Share Posted January 16, 2013 thank you alex......for the information........ Link to comment Share on other sites More sharing options...
thanulee Posted October 10, 2013 Share Posted October 10, 2013 (edited) Hello, I didnt want to start a new topic. Im using rsmb but I have inaccurate motion blur in my video. Maybe im exporting the pass wrong from elements. My main question is: At vray pass, should i change the number in "max velocity" and make it the larger value? Cause i left it at 1.0 though i have way larger values in all my animation. I can assume that this is it and i wanna make it clear before i re render. Thanx ps. Also the shutter speed in my camera, has anything to do with the Velocity pass? In general i control the motion blur from there when i bake it from camera, but i have no clue if shutter speed affects the pass also. Edited October 10, 2013 by thanulee Link to comment Share on other sites More sharing options...
Tommy L Posted October 10, 2013 Share Posted October 10, 2013 (edited) My understanding is that the number should represent the maximum distance in pixels that any object will travel onscreen from one frame to another. So if you leave it at 1 then I assume there is practically no value being rendered in the pass. Is your whole velocity pass grey? If you are using a VRay Cam then the shutter speed will obviously affect the exposure if you have 'exposure' checked. Shutter speed will affect your rendered motion blur, but I assume you are not rendering MB or you wouldn't need the velocity vector pass. I think it will affect your velocity pass if you have MB enabled in Vray cam. A typical workflow would have MB unchecked, so the shutter speed would not affect the velocity pass. Edited October 10, 2013 by Tommy L Link to comment Share on other sites More sharing options...
thanulee Posted October 10, 2013 Share Posted October 10, 2013 no, at 1 is fully colored even if everything standing still! I used now the max value i saw in my frames and it kinda did it. The quality though is still poor. Maybe i should go for 32 bit only with velocity pass? thanx Link to comment Share on other sites More sharing options...
Tommy L Posted October 10, 2013 Share Posted October 10, 2013 oh, yeah, I was thinking about it the other way around. If you leave it at 1 then the velocity will be at 100% for any object that moves one pixel. Figure out the farthest something travels onscreen for one frame, use that as your '100%' MB. If your number is too BIG then everything will be grey. And no, you dont need 32bit. I think RSMB in AE crunches stuff down to 8bit for computation anyway, but I may be wrong there. At 8bit you'll still have 256 degrees of MB which is plenty. Link to comment Share on other sites More sharing options...
thanulee Posted October 11, 2013 Share Posted October 11, 2013 Well, things are like u said. I have one more question though. Should i use the maximum value I see in my scene or maybe something less? My image sequence with the maximum value had very few blur and mostly in the parts that was going very very fast. thanx again Link to comment Share on other sites More sharing options...
thanulee Posted October 24, 2013 Share Posted October 24, 2013 Anyone plz? In the max value field, if i enter tha maximum value i actually have on my scene, then the pass is almost grey. Thus in post i get very subtle to no blur at all. What is the actual number i must enter in max value? Maybe max value represents the shutterspeed? I can enter a random small value and teat, but that is not the case. I need to be know what im doing! Thanx Link to comment Share on other sites More sharing options...
Tommy L Posted October 24, 2013 Share Posted October 24, 2013 The velocity pass is not based on physical values. Its a hack and it is just how I described. If you want more blur then use a lower number or use a stronger effect in post. Link to comment Share on other sites More sharing options...
thanulee Posted October 24, 2013 Share Posted October 24, 2013 According to this tutorial the number you enter is not random http://www.timsportfolio.co.uk/tutorials/velocity-pass-3ds-max/ Everything works as described there, but my maximum value is just not corresponding as should. Its very very subtle though i have a bug that moves its wings like every 2 frames.. The pass doesnt seem to separate the very fast with the almost still items. So if map is wrong, in post cant do shit... It blurs everything if i add too much mb... So anyone knows what max value represents? Thanx Link to comment Share on other sites More sharing options...
Tommy L Posted October 24, 2013 Share Posted October 24, 2013 I didnt say its random, I said its not based on physical values. Its computed in 'screen space', rather like a post effect, or thats my understanding of it. If you have an object you want to blur in isolation then you could render that object seperately. Just geometry, you wont nee lights etc so it will render in 2secs a frame and you can use the blur map in post. Link to comment Share on other sites More sharing options...
thanulee Posted October 24, 2013 Share Posted October 24, 2013 Thats what i ve been doing but its kinda stupid and its not 2 secs per frame when u got a full HD project Plus its a heavy post process which doesnt quite rendeds in AE that fast in my 6 core computer... Well, i guess i keep experimenting till my deadline drops thanx mate Link to comment Share on other sites More sharing options...
Tommy L Posted October 24, 2013 Share Posted October 24, 2013 Thats what i ve been doing but its kinda stupid and its not 2 secs per frame when u got a full HD project Plus its a heavy post process which doesnt quite rendeds in AE that fast in my 6 core computer... Well, i guess i keep experimenting till my deadline drops thanx mate turn off lights, GI, materials and reflections globally in the Vray panel and it will be 2 seconds a frame. Link to comment Share on other sites More sharing options...
thanulee Posted October 24, 2013 Share Posted October 24, 2013 Ye, as said, thats what i ve been doing... And its not its actually around 16-20 sec in order to be sharp in 720p in a 6 core i7! U cant have alising on ur edges cause then ur mb pass is even worst in post... Link to comment Share on other sites More sharing options...
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