No 3D rendering(black area) on macOS

[HuguesDelorme]

Reported by @grexe in issue #151

However when trying to load a sample STEP file from nist.gov, namely this one, and opening nist_ftc_06_asme1_rd.stp, I only get a black canvas. The same file opens fine with e.g. CAD Assistant, which also uses OpenCascade.

Notice that some other user(@livigni) mentionned Mayo to run correctly on macOS(see https://github.com/fougue/mayo/issues/67#issuecomment-1137480691)

[HuguesDelorme]

@grexe Is there any OpenGL error prompted in the terminal when running Mayo ? Can you please post here Mayo's console output on your machine ?

As a workaround you can comment the if() block between lines 350-363 in src/app/main.cpp : https://github.com/fougue/mayo/blob/e41d872be90744e9c8efd890e163f09f1d7c8c01/src/app/main.cpp#L350 Build and run again

[grexe]

This is the output I get (using MacOS 12.6 (21G115)):

gregor@Gregors-MacBook-Pro mayo.app % ./Contents/MacOS/mayo
DEBUG: OpenCascade settings file doesn't exist or is not readable [path=opencascade.conf]
INFO: OpenGL v2.1
WARNING: Back buffer dpr of 2 doesn't match <_NSViewBackingLayer: 0x60000170cb40> contents scale of 1 - updating layer to match.
WARNING: Back buffer dpr of 2 doesn't match <_NSViewBackingLayer: 0x60000170c270> contents scale of 1 - updating layer to match.
WARNING: Back buffer dpr of 2 doesn't match <_NSViewBackingLayer: 0x60000171a820> contents scale of 1 - updating layer to match.
WARNING: Back buffer dpr of 2 doesn't match <_NSViewBackingLayer: 0x600001718120> contents scale of 1 - updating layer to match.

will try the code change later.

[zambetti]

Hello @HuguesDelorme & @grexe

I was experiencing this same issue on MacOS 13.0.1 (22A400), I followed your advice to comment out the block in main.cpp under the comment "// Use QOpenGLWidget if possible"

All is working fine now. Looking good.

[jhillhouse92]

@HuguesDelorme comment fixed it, on OS X Big Sur. Thanks!

[HuguesDelorme]

@zambetti and @grexe Please try new option Force OpenGL fallback widget to tweak OpenGL support.

[zambetti]

@HuguesDelorme I have just downloaded and built the latest version, and I can confirm the fallback widget works on my machine. Compliments on this nice application.

[andrsd]

Hi!

I had the same issue with the black screen. I tried the fallback widget option (i.e. I turned it off and restarted mayo), but that did not work for me. Commenting out the whole block in src/app/main.cpp, i.e.:

#if OCC_VERSION_HEX >= 0x070600
...
#endif

(roughly lines 392-408) fixed my problem. Now, I can see the model.

I am on Ventura 13.1, Apple M1 chip, built mayo against Qt 6.2.4 (IDK if that matters).

[HuguesDelorme]

@andrsd The "fallback widget" option should be set to ON. Please check again with that option turned ON(and without the comment of course) Let me know your feedback!

[andrsd]

The fallback widget was originally ON. I believe that's the default (?). That's when I had the issue with black screen, so I went to look for the cause and found this issue. I can try again. I forgot to mention I built the this version: c85fe27fbfa27ba9b163b01bb54036473fa31e4f

[andrsd]

I tried a clean build of c85fe27fbfa27ba9b163b01bb54036473fa31e4f, made sure the Fallback widget was ON and all works as expected. Hmmm... 🤔

[HuguesDelorme]

@andrsd I confirm the forceOpenGlFallbackWidget option is set to ON for macOS by default. https://github.com/fougue/mayo/blob/c85fe27fbfa27ba9b163b01bb54036473fa31e4f/src/app/app_module_properties.cpp#L87

I don't like this option, it's preferrable to fix the OpenGL framebuffer rendering with Qt for macOS But until this gets fixed, seem like for macOS this workaround is required.

[andrsd]

This is a pure guess and I might be totally wrong, but could it be that because MainWindow is created before appModule->settings()->resetAll(); is called, then on a clean machine (i.e. machine where mayo was never run before) for the first time the setting is not applied which would cause the black screen?

[HuguesDelorme]

@andrsd You might have spotted a potential issue, I need to check this. The forceOpenGlFallbackWidget setting is explicitly loaded here: https://github.com/fougue/mayo/blob/925403f13a3c5f6642c4f3812000ea4b8551514c/src/app/main.cpp#L394 But for some reason this could fail on the very first execution of Mayo