Expression not updating on time change

[chaneyx]

I would expect my expression to update everytime there is a time change as per the docs "By default, an expression also executes whenever the current animation time or frame changes"

But this MEL expression only prints once : 

int $f = frame;

print $f;

Here is the output : 

90// Result: expression1 //
currentTime 54 ;
currentTime 39 ;

Is this a bug? 

[rajasekaransurjen]

Hi,

In Time Slider preferences Select Play Every Frame.

[chaneyx]

That is my setting. It still does not work. 

Thank you, 

Chris 

[chaneyx]

Definitely a bug with the "Serial" and "Parallel" evaluation mode in 2019. It does not occur when the evaluation mode is set to "DG" in 2019. It does not occur in 2018.

Another odd behavior is when the expression is first created or edited, it executes the print statement for every frame on the time slider. So if I have a playback range of 1-120, it prints 120 times. This only occurs when another object is included in the expression as shown below. 

currentTime 47 ;
expression -e -s "ry = frame; \nprint \"S\";" -o pSphere1 -ae 1 -uc all expression1;
S// Result: expression1 //
SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS

[tony.su · Accepted solution]

Please switch to DG, the print will work. I report this issue to our develop team.

[chaneyx · Accepted solution]

Tony, 

Thanks for the info. Marko S. also assisted me. Disabling the cached playback had some success with the other modes as well. 

Chris