PRB: Incorrect Behavior from an Expression-Affected Element
  
PSS ID Number: Q176595
Article last modified on 11-26-1997
 
IRIX:3.7; WINNT:3.7
 
IRIX winnt
 

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The information in this article applies to:
 
 - Softimage 3D for IRIX, version 3.7
 - Softimage 3D for Windows NT, version 3.7
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SYMPTOMS
========
 
You have saved keys for an object's explicit translation, then plotted the
object's velocity. The object with the plotted velocity is then used as an
Expression element with a 'velx' Fcurve (exp_element.velx).
 
The problem is apparent when the Y rotation of the affected element does
not behave according to the velocity Fcurve of the Expression element.
 
CAUSE
=====
 
Although the velocity of the object used as the Expression was plotted, the
velocity Fcurve in reality is not a true one.
 
RESOLUTION
==========
 
1. Apply a QStretch property to the Expression element (Velocity -> flex
   with a maximum of 0.0 and sensitivity of 0.0).
 
2. Plot the velocity for the Expression element.
 
3. Playback the animation or translate the Expression element. The
   affected element now behaves according to the Expression's velocity
   Fcurve.
 
STATUS
======
 
This behavior is by design.
 
REFERENCES
==========
 
If you have any questions concerning the information contained in this
article, contact support@softimage.com by e-mail.
 
Additional query words: si si3d si3dmot
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Keywords          : si si3d si3dmot
Version           : IRIX:3.7; WINNT:3.7
Platform          : IRIX winnt
Issue type        : kbprb
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Copyright Microsoft Corporation 1997.