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Author Topic: Forest placed car's generate no motionblur  (Read 1744 times)

tg

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Forest placed car's generate no motionblur
« on: October 08, 2019, 02:31:16 PM »
I try to use Railclone and Forest to place (and later animate) Car's. This is explained in Parking Cars Tutorial
https://www.itoosoft.com/tutorials/parking-cars?back=page%3D8

To animate the placeholder Arrows in Railclone, I started another thread in the Railclone Forum
https://forum.itoosoft.com/railclone-pro-(*)/macro-animate-along-path/
Thanks Itoosoft Team this works fine now.

Now i run into a new problem when rendering the scene, the cars are moving, but there's no motionblur.
We need to render a timelaps, so motionblur is essential needed. When rendering the Railclone-object (after disable "use instancing engine") motionblur is applied.

Any idea how to solve this?

Rokas

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Re: Forest placed car's generate no motionblur
« Reply #1 on: October 08, 2019, 04:09:13 PM »
When rendering the Railclone-object (after disable "use instancing engine") motionblur is applied.

Is it not the solution?
Rokas
iToo Software

tg

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Re: Forest placed car's generate no motionblur
« Reply #2 on: October 08, 2019, 04:50:53 PM »
It's the solution to render the Railclone object in Vray, but it not solve the problem for Forest.
Eyervday another challenge... ;)

Perhaps there's no motionvector transfered to vray?

It would be really nice to solve this because to me it seams to be a smart solution.
At the moment i do the animation by hand and that isn't really fun.
« Last Edit: October 08, 2019, 04:55:15 PM by tg »

iToo

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Re: Forest placed car's generate no motionblur
« Reply #3 on: October 09, 2019, 08:44:02 AM »
Hi, unfortunately there is not a simple solution for this problem.

As you pointed out, V-Ray requires that motion vectors are defined explicitely.  But in Forest motion depends of the position of each item at different time intervals.
That means we should compute the full distribution at least two times: one at the current frame, and other at the next frame, to get the difference between them.
That effectively doubles the processing time, besides adding an extra level of complexity to the Forest workflow (which is very complex already).

Carlos Quintero
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Rokas

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Re: Forest placed car's generate no motionblur
« Reply #4 on: October 09, 2019, 08:50:21 AM »
I would add that it is possible to have motion blur when using Particle Flow as distribution mode:
Rokas
iToo Software

tg

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Re: Forest placed car's generate no motionblur
« Reply #5 on: October 11, 2019, 09:50:41 AM »
Thank you for your reply's.
At the end we used Railclone to finish the job. I placed the cars with RC and animate them with the "animate along path" macroscript. If RC instancing engine is off and the cars are vrayproxies which are visible as meshes.

Thanks for the Tipp with the animated particles. I tried this a few times but got no reliable result using particles along a path. So RC was the best option.