Difference between in-canvas and local renders.

[n8bot]

I have a scene that has a lamp, with a lamp shade that has the copper mesh texture. There is an emissive texture with full luminosity applied to a small filament body. It looks great with the in-canvas render, but looks bad in the local background render. See photo.

[ryan.bales]

What are your local render advanced settings?  It's likely that with 9000 iterations and 3000 seconds that the local render CANT compete based on sheer allowance of quality.

[n8bot]

The local background render was performed at maximum settings. The in-canvas render looks better/different even from a very low iteration. It is definitely different in several ways. The orange glow is lacking in BG local, the seeming lack of anti-aliasing, the reflections are different, and some other qualities that are hard to pinpoint.

[ryan.bales]

Are you able to share the file with me for testing? 

[n8bot]

Yes, here is the public link with download enabled: https://a360.co/2S5NGAX
If you need me to add you to the project too, let me know. This was a submission for the coursera course on generative design, so it's not top secret or proprietary in any way.

[ryan.bales]

This is strange. Let me tag @SallyYang in and see if she can provide some insight as to why its doing this. 

[SallyYang]

Hi Ryan,

Thanks for reaching out.

I can reproduce this issue using the model shared and it seems a defect of local render. I've reported it to the development team for a resolution. The ticket ID is FUS-58287.

[GeekFieldGuide]

I can help narrow down where there is a significant issue between the in-canvas render and the local render.

If you create an appearance and alter the absorption distance, the in-canvas render respects that value, but the local render completely disregards it, which can cause major issues when trying to work with translucent objects.
Easy repro method: Create a prism with a translucent colored material, set the IOR to Air, and adjust the absorption to a very thin vs. very thick value, and compare on local and in-canvas.

Thanks!

[SallyYang]

Thanks for your kind suggestion. It's very helpful.

I will let the development team know and update the ticket with this information then. 

[sebB6TUV]

Have there been any updates with regards to this bug?

I'm seeing the same issue (along with countless other bugs) and it is super frustrating to work with something so unreliable.

In my case I'm also seeing different colours on in-canvas vs local render. For example I have some led's that used to be red and changed them to green using stock materials. In-canvas shows green, local render shows red.

UPDATE: I managed to fix this particular issue (red vs green) by deleting some hidden bodies in a linked project which had the same LED's in red which can be seen in the local render as the green is still bleeding through on the edges. This happens all the time, i.e. hidden bodies showing up in some renders. However with regards to this topic you can still see the difference in the purple light source being brighter in the local render vs in-canvas render.

[TrippyLighting]

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@sebB6TUV wrote:

...along with countless other bugs...

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Can you provide some more specifics on those countless bugs?

[sebB6TUV]

Sure can. I didn't want to derail this thread but since you asked..

1) Fusion freezes or takes extremely long to start on poor or no internet connection. I frequently work on the train and opening local projects shouldn't be an issue but trying to open Fusion with no internet connection is sometimes impossible so I tend to keep it open in the background. Disabling all network adapters works sometimes but not always.

2) Trackpad navigation in Fusion often fails, is buggy or some multi-touch features stop working. For example very often pinch zoom stops working and two finger scrolling which normally moves the camera, zooms the camera instead. Since a recent update, whenever a config menu is open for a certain operation, let's say moving a body, results in unbearably slow trackpad navigation, i.e. zooming, moving or rotating the camera is very slow.

3) Rotating the camera using the cube in the top right corner of the viewport gets stuck after releasing the trackpad IF the cursor is wrapping the screen. I.e. if you rotate the camera to the right your mouse/trackpad cursor will go off-screen and appear on the left side of the viewport. At that point Fusion doesn't recognise when you release the mouse/trackpad and moving the the cursor will continue to rotate the camera. This is 100% repeatable. The only way to escape this behaviour is to pan and click somewhere in the viewport.

4) Local renders sometimes do not start until you restart of Fusion. This is documented in another thread as well.

5) Fusion browser overlay showing on the desktop when fusion is minimised or the browser is stuck on another desktop 'Space'. I.e. on MacOS you can swipe between multiple applications that are in fullscreen mode by using a three finger swipe, if you swipe between Fusion and the desktop (for example), the Fusion browser will be stuck on the desktop but is not showing in Fusion.

6) As mentioned above and in other threads, sometimes Fusion shows hidden bodies on local renders but not in-canvas. This usually happens with linked projects.

7) SpaceMouse Horizon Lock is not working on MacOS making the device useless to me. This has been fixed on Windows but not for MacOS. https://forums.autodesk.com/t5/fusion-360-support/3dconnexion-spacemouse-horizon-lock-constrain-orbi...

System config: 16" Macbook Pro 2.4GHz i9, 64GB RAM, Radeon Pro 5500M 8GB

[TrippyLighting]

Thanks for providing that list!

I spend quite a bit of time on this forum, so I've seen most of those issues reported previously, but isolated.

When presented in this bundled form they  accumulate to a pretty unsatisfactory user experience when working mobile!

As it pertains to the rendering side of things, can you share the model? 

Have you tried the native trackpad support in preview right now?

It can be enabled in the preferences:

[sebB6TUV]

Thank you for the quick reply. I didn't know about the native trackpad preview, that sounds promising. Will test and report back!

Re rendering bug, I can't share this particular model but I have attached a simple test project which shows the difference very well.

[TrippyLighting]

I can see the images, but no attachment.

[sebB6TUV]

Sorry, my bad. Should be there now.