Forums > Jitter

jit.anim.drive to control scale and jit.phys.body to control position and rotate


Robin Price
Feb 28 2012 | 11:00 pm

Any idea how I use jit.anim.drive to control the scale (I want to make something pulsate) and jit.phys.body to control the position on rotation of a gridshape?

My efforts crash jitter.


Andrew Benson
Feb 28 2012 | 11:25 pm

Post a patch, so we can better see exactly what you are trying. Also, if you are getting reproducible crashes, please be sure and visit http://cycling74.com/max6-bug-form/ and let us know!


Robin Price
Mar 01 2012 | 4:32 pm 


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Is this right? It seems weird.

Andrew Benson
Mar 01 2012 | 5:00 pm

Try this.



-- Pasted Max  Patch, click to expand. --  





By setting the @targetname , we don’t have to connect directly to the controlled object.  Then you can filter the messages coming from jit.anim.drive and send them where you want.  HTH

Robin Price
Mar 01 2012 | 7:42 pm

Cheers that seems better.


Rob Ramirez
Mar 01 2012 | 7:49 pm

also, if you set @send_scale 1 on your phys.body, you only need to send the scale values to the phys.body, and they will propagate to the gl.gridshape.


Robin Price
Mar 01 2012 | 9:33 pm

Cheers yeah, I unset it because having the gridshape receive scale from both phys and anim understandably made jitter angry.


Robin Price
Mar 02 2012 | 1:04 am

Something’s still not right, I can use jit.anim to make both the phys and the gridshapes change their scales but when I try to move the phys object with an impulse message it moves for a tiny bit then stops.



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Rob Ramirez
Mar 02 2012 | 6:39 pm

simple rigid-body shapes don’t like to be scaled. the engine basically recreates the collision shape everytime you adjust the scale. thus the forces are not working.

however, convex-hull shapes don’t have this problem. so you can achieve this effect by doing the following:



-- Pasted Max  Patch, click to expand. --

Robin Price
Mar 02 2012 | 7:28 pm

Cheers, that really helps.

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