Use Reduce Keys to decrease
key density. Animating with inverse kinematics, or creating any
complex animation, can result in many keys, which can make editing
the animation difficult. In the case of applied inverse kinematics, 3ds Max Design generates
a key on nearly every frame. Often, the same animation can be produced
with fewer keys. Having fewer keys in a track makes it easier to
change your animation.
Reduce Keys analyzes
the pattern of keys in a block of time and creates a new pattern
of fewer keys that produces nearly the same animation. You specify
how closely the new animation matches the original.
The Reduce Keys button,
depicted above, appears on the Keys Toolbar only in Curve Editor,
but you can add it to a Dope Sheet toolbar with
To reduce keys:
- Select an animated object.
- Right-click the object and choose Curve
Editor or Dope Sheet from the quad menu.
- In the Hierarchy list, highlight the
tracks whose keys you want to reduce. Reduce Keys works only on
- Optionally, in the Key window, specify
a time range within which to reduce keys. Highlight a key at either
end of the range to reduce, or drag a selection rectangle around
the keys you want to reduce. Alternatively, in Dope Sheet mode,
highlight specific tracks and then use
Select Time to
designate a block of time within which to reduce keys. If no keys
are highlighted in a highlighted track, Reduce Keys works on all
keys in that track.
You can use any of the
above methods to specify different ranges for different highlighted
- From the Keys menu, choose Reduce Keys.
3ds Max Design opens the
Reduce Keys dialog. This dialog has a single Threshold parameter.
Raising the Threshold
setting will increase the number of keys that are reduced. The higher
the threshold, the greater the reduction.
- Click OK to reduce the keys.
Observe the results.
If you are left with too few keys, press Ctrl+Z to
undo, then lower the threshold and reduce the keys again. If too
many keys remain, increase the threshold and reduce keys again.
Tip It will take repeated
experimentation to find exactly the right threshold for your particular
- Reduce Keys
Displays the Reduce Keys dialog.
Sets a threshold value. Higher
values will result in fewer keys.
Accepts the Threshold setting
and reduces keys as follows:
- Keys are reduced only in highlighted
- If any of a track's keys are highlighted,
reduction is performed only within the indicated range (that is,
between the leftmost and rightmost highlighted key for each track).
If no key is highlighted, reduction is performed on all keys in