Using IK Blend Keeps Crashing Maya 2020

[tkr.k]

When I use the IK Blend function, Maya 2020 stops working.

I just made a joint chain, made an IK handle and tried to use IK Blend.

I think it's a bug or dose anybody experience this too?

Case 1

Case 2

[kelly_hynes]

Hello,  

I'm not able to reproduce this.  Could you send a few more details.  Are you on 2020, or a 2020 update release?  What platform are you using (win, mac, linux)?  Also, do you have a CER number and/or call stack you could send me.

Kelly

[tkr.k]

I use Maya 2020.4 with Windows 10 Home.

I tested both Single-Chain and Rotate-Chain Solver and got the same issue.

My IK handle settings are set as a default(clicked "reset tool" and made the handle).

I noticed after I keyed an IK blend attribute, changing the attribute number by holding a middle mouse button and sliding left and right stopped working.

[mspeer · Accepted solution]

Hi!

I can't say anything about the crashing, but the middle mouse update issue in the Channel Box reminds me of a bug in Maya that should be fixed in Maya 2022.

Please try Evaluation Mode "DG" instead of "Parallel" or even better try Maya 2022.

[tkr.k]

Thanks for your input, @mspeer

I did set Evaluation Mode as Parallel while doing the test.

DG Mode seems working fine. I have encountered neither the IK blend bug nor the middle click issue.  It's a good workaround.

I tested the same scenario in DG and Parallel with Maya 2018 and there was no problem.

I say this is a bug. Parallel Evaluation has been a default since Maya 2016.

Do Autodesk intend to fix this or Maya 2020 bugs in general?

Or they focus on only Maya 2022 updates? 

Could @kelly_hynes give me the answer?

[mspeer]

Hi!

If I remember correct this was a bug introduced in a Maya 2020 update, maybe even it's only in Maya 2020.4, so you could try a previous Maya 2020 version.

I recommend to upgrade to Maya 2022, especially if there also other bugs in Maya 2020 that you want to have fixed. (Further updates for Maya 2020 are extremely unlikely.)