After Solution Exception (Rhino 8)

[victorlin (Yu Chieh (Victor) Lin)]

I’m encountering an issue where my component works fine in Rhino 7 (left), but when loaded in Rhino 8 I get 1. After Solution exception:Object reference not set to an instance of an object.(right)

I’ve tried to run Rhino 8 in debug mode with /netfx switch, but the exception isn’t being caught.

The component is basically a “custom preview component”, it inherits GH_CustomPreviewComponent, so that I can override DrawViewportMeshes and AppendRenderGeometry, I think inheriting GH_CustomPreviewComponent is causing the issue, as I’ve commented out all the code logic so that it’s barebone, and it’s still showing the exception.

Functionally speaking, the component works fine, as far as i can tell, but I would like to know what the exception is.

[p-e-t-e-r (Petr Klimenko)]

It seems we are writing about the same problem.

Error in Component for custom type preview after moving to Rhino 8

The component was written for a plugin in Rhino 7 (.NET Framework 4.8) and worked correctly. After the plugin with this component moved to Rhino 8 (.NET 7), the component started throwing an error. The error that the component displays sounds like “After Solution exception: Object reference not set to an instance of an object.” It is important that the component still produces the correct result, but at the same time shows an error regardless of whether the wires are connected to it or the input…

[victorlin (Yu Chieh (Victor) Lin)]

Yes, it’s basically the same issue, but for me, after disabling “Enable Just My Code” the exception occurs in the the GH_CustomePreviewComponent class, for some reason the base seems to be null in base.AfterSolveInstance()?

My current temporary fix is to override AfterSolveInstance, and let it do nothing

override protected void AfterSolveInstance()
{ }

Would be nice if there’e a more proper solution.

[Alain (Alain Cormier)]

Hi, I can’t reproduce this problem. Do you have code that you could share?
Thanks

[victorlin (Yu Chieh (Victor) Lin)]

hum, interesting, now I’m not able to reporduce this problem on my personal computer.
I will check again on my work computer tomorrow

[p-e-t-e-r (Petr Klimenko)]

The Custom Preview component has lost shadows in Rhino 8

[Screen] The component inherits GH_CustomPreviewComponent and overrides the AppendRenderGeometry method. I followed the recommendations of @andy and @DavidRutten in the thread @enmerk4r However, this does not work, the debugger does not hit the breakpoint, and the AppendRenderGeometry method is not called. I suspect something has changed in Rhino 8. The component worked fine in Rhino 7, but stopped working correctly in Rhino 8. I have attached a test cs file of the Component, as well as 3d…

here I posted the files with this problem

[victorlin (Yu Chieh (Victor) Lin)]

So I’m having a bit of an interesting situation, on my work computer, this exception shows up
on my personal computer, with the same gh and gha files, everything is fine

Both computers have the latest Rhino 8 installed, I have a bit more plugins installed on my work computer, but I don’t think that would be the cause (maybe)?

Do you have any suggestions on what I can do to pinpoint the issue?

[Alain (Alain Cormier)]

I don’t see what the problem is right now.
I logged the issue here.

[kiteboardshaper]

Just dropping a note here so I can follow this thread. My plugin is showing this same error in R8.

Cheers

DK

[kike (Kike Garcia)]

Hi @victorlin,

This will be fixed on the next RC.

[victorlin (Yu Chieh (Victor) Lin)]

out of curiosity, could you briefly explain what the issue is? and why it’s not happening on some computer but not others?

[kike (Kike Garcia)]

It happens on components that inherit from GH_CustomPreviewComponent and implement BeforeSolveInstance without calling base type implementation but do call AfterSolveInstance base type method.

If you override BeforeSolveInstance and call base type, you should call base type also on AfterSolveInstance or don’t call base type in any of these two overrides.

Previous versions of Rhino where immune to this issue, but calling those methods in pairs or not calling them at all should work on any version of Rhino.

[kiteboardshaper]

Ok, this sounds exactly the issue we have been seeing, looking forward to testing the new update when available

Cheers

DK

[Alain (Alain Cormier)]

Hi,
Is this working for you now?

[kiteboardshaper]

Hi Alain,

Tho I first thought this issue was sorted, Unfortunately I’m still getting the error code on loading of my plugin:

Any further ideas on where I might be able to find the issue/solution? It does cause my plugin to randomly crash in R8 Win for my test user.

R7 Win/MacOS and R8 MacOS (tho not tested a lot) dont seam to show the issue.

Thanks

DK

[kiteboardshaper]

OK - After doing the above test Rhino 8 updated itself and I have re tested with NO error coming up.

This is the new version that it updated too.

I’m going to test again now - just to be sure.

Cheers

DK

[kiteboardshaper]

OK - that launched without the display pipeline error! THANKS! Not sure what has changed in the latest version but that is looking good from my end.

Cheers

DK

[Alain (Alain Cormier)]

Great! Thanks for reporting back.

[kiteboardshaper]

Opps - spoke to soon - error is back:

This is a new build from today, only changes I’ve done is some clean up in my bake/export code.

The source is edited/built in R7 - I’m going to open the source in R8 now to see if I can find the issue.

Cheers

DK

[kike (Kike Garcia)]

Hi @kiteboardshaper,

This error is a different one, it happens during the display and not during before-after solution methods.
Do you mind enable stop on Exceptions on Visual Studio and send a screenshot of the call stack when this happens?