Weird artifacts when showing hidden edges

[robduarte]

Hi all,

I'm almost certain this is a problem that's just appeared as I view hidden edges all the time and have never encountered this until recently. As you can see in the attachments, I am getting weird artifacts (gradients that appear to be surfaces that don't actually exist, and phantom edges that don't exist) when I turn on Shaded with Hidden Edges OR Wireframe with Hidden Edges. These errors only appear when looking from certain sides: for example it appears like this for the RIGHT and LEFT view but not the FRONT view (or a random orbit view) - even though the model is symmetrical and should appear the same from all sides. It's definitely a bug of some kind and I'd expect someone to say that it's related to a graphics card driver, except that the SAME behavior occurs on a Thinkpad T430 with Windows 10 and an iMac with Sierra. I can file this as a bug but I figured I'd post here first to see if anyone else noticed when it started appearing.

[masa.minohara]

Hi Rob,

Thank you for posting! That does look weird to me. Would you be able to share a public link to the design with me? I'd like to take a closer look and will log the issue with the development as required.

[robduarte]

Anyone should be able to reproduce the problem in about 20 seconds with a new design. Here is a screencast showing the problems: https://youtu.be/9OgB4PTwHUc  and here is the public link to the design in the video: http://a360.co/2dn5en9

Thanks!

[PhilProcarioJr]

@robduarte

I don't have the artifacts you do.

[PhilProcarioJr]

@robduarte

I even turned on all effects and made it a little more complicated to check. What video cards are you seeing this with?

[robduarte]

That's interesting - I assumed that it'd be common to everyone since I'm seeing the same thing on two very different systems... one is a Thinkpad T430 with on-board Intel graphics and the other is an iMac with NVidia GT750M. Maybe the thing they have in common is that they both have low-end graphics cards and that Fusion 360 is rendering accordingly. Maybe you're not seeing it because you have a better graphics card and Fusion 360 isn't operating with all the limitations shown in the attachment below...

[PhilProcarioJr]

@robduarte

That's possible although I have a laptop with low end gfx and it doesn't have it either.

What happens if you turn off AO and ground shadow? Does it still show the artifacts?

[robduarte]

I just turned off every effect and it still looks the same.

[masa.minohara]

Phil  - Thank you for checking this!

Rob - I tested in Mac and was able to reproduce it. (I don't see this in my Windows environment)  I am sorry for the inconvenience but I am not sure how to work this around at the moment. I have logged this issue with the development (FUS-27921) and they will review it. 

Thank you for reporting the issue!

[keqingsong]

@robduarte Good news, we have a fix for this in the Jan update!