Rendered Motion Study is Jumpy

[brysonwhitedesign]

I'm having trouble getting my motion study to render correctly. It has rendered correctly before for this design, but it is not rendering correctly now.

I'm using Fusion 360 version 2.0.5338 on a Mac with MacOS Mojave version 10.14.2.

Please see the Motion Study Screencast that I've included with this post first. That shows the motion study that I have set up. It's a pretty simple motion study. Notice that the cylinder expands and contracts once as the projectile moves through it.

Then see the attached video which is the rendered motion study. Notice that the cylinder jumps in and out as the animation progresses.

I have tried several things including:

• Editing the motion study.
• Making a new motion study.
• Deleting all motion studies, saving, restarting Fusion 360, and making a single fresh motion study.
• Making a motion study with points all along the way to "hold" the cylinder in the correct location as seen in the attached image.

I have tried several of these things over and over, first cloud rendering a still image, then using the image to render a video. I continually get this same jumpy result, though, the jumps are at different times in different attempts.

This project is for a client who is in need of the animation as soon as possible, so any help would be greatly appreciated.

Thank you,

Bryson White

[brysonwhitedesign]

I included this screencast with the original post. I'm not sure why it didn't post.

This screencast is the motion study that I'm attempting to render. Notice that the cylinder expands and contracts once as the projectile moves through it.

Thanks in advance.

[karina.harper]

Hi @brysonwhitedesign 

Do you think you could share the design?

I'd like to try and reproduce this on my computer. It's hard to say exactly how you could fix this without messing around with it. If you are concerned about confidentiality, you can always DM me the password or the file.

[brysonwhitedesign]

I'm sorry, but I'm not sure what you mean by DM you the password or file.

[karina.harper]

Hi @brysonwhitedesign 

Sorry about that - here are directions to create a public link to your file, in the last image there is a place to add a password to the file. There you can set a password and then you can private message (here on the forums) me the link and the password and then I can access it.

Does that make sense? Let me know if I can explain further.

[karina.harper]

Hi @brysonwhitedesign 

Thanks for sharing your file. I'm seeing the same behavior on my end - I'm not exactly sure what's causing it but I think it has to do with the spring. I'm noticing that area is a little buggy. I'm still working on it, but do you mind if I put gifs/images of the file here on the forum post? 

[karina.harper]

Hi @brysonwhitedesign 

So I've spent most of the day working on this one. Unfortunately I haven't been able to get it to work correctly - Slider 62 works without Slider 77, but even after re-making the motion link, together they trigger the bug.

I have created a case internally that will try and figure out what Fusion is doing wrong here. (RAAS-16927)

[brysonwhitedesign]

Thank you for working on this. I'm sorry I took so long to reply. I've been at work. Yes, feel free to post GIFs.

I've attached a couple earlier attempts that actually worked. The timing wasn't quite what my client was looking for. So did some adjusting of the timing within the motion study, and now I can't get it to work at all.

Did you try deleting the motions studies and adding your own?

[SallyDong2005]

Hi,

I am Sally from cloud rendering team, I forwarded the issue to our developer team to check it. I played with your model for a while and find a workaround for you. you could try to remove the duplicated key frame, just keep the key frame which have position change. For example, I edit the motion study and just keep the key frame which has red arrow and the motion study will work good. 

[karina.harper]

Hi @brysonwhitedesign 

I did create some new ones but I didn't adjust the timing too much. I'm glad to know that little adjustments work - I'm very curious as to why that specific timing breaks the render.

Great note from @SallyDong2005 - looks like adding a transition frame works well. That's awesome! I'll stick that in my back pocket as well.

[brysonwhitedesign]

I'm sorry--not trying to be difficult--but this doesn't really help. I've tried this. I started out with key frames only at the change positions. As I mentioned in my original post, I only tried adding additional key frames after running into problems.

I've tried it with key frames only at change positions, at various frames, and at every single frame. None of these are working now.

Any additional feedback would be greatly appreciated as my client is getting very antsy.

Thank you for looking into this!

[SallyDong2005]

Hi Bryson,

I rechecked the model and found that the motion study is still inconsistent even after just keep the key frame. it looks like the fusion translator have problem to translate the motion study data to cloud rendering. Our developer is checking it. Any solution will let you know.