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Date: Thu, 27 Jul 1995 03:45:42 -0400 (EDT)
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Subject: Easy key-frame deletion?
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I need to delete a LARGE number of keyframes from a scene, without
affecting other keyframes around them.

Here's the situation...while playing around with the new version of
Impact!, I've been able to come up with some VERY cool scenes...but, one
of the problems I've run into is that I need to increase the frames per
second sampling rate in order to allow Impact! to detect collisions
correctly...since Impact! generates a keyframe for EVERY frame, I end up
with a LOT of extra keyframes in the scene that I have to manually delete.

A scene I'm currently generating required me to up the frames per second
sampling rate to 120 frames per second....the simulation is 20 seconds
long, so when it's done I'll have an animation that is 2,400 frames
long...obviously, all I need to do is render every 4th frame in order to
get an accurate 30fps playback rate, but if I want to incorporate this
simulation into another scene, I'll need to delete 3 out of every 4
keyframes and then scale the scene down to the proper 600 frames.

The reason Impact! needs this increased frames per second sampling rate
is because if an object passes through another object during the
simulation, it will really screw things.  So, if an object is too far
away from another object for collision detection to register at frame 40,
but it is intersecting the other object at frame 41, then there is going
to be a problem.  To get around this, I need to increase the frequency
with which Impact! checks for collisions and the only way to do that
(right now) is to increase the frames per second value.

It would be great if LightWave could elliminate keyframes when the Scale
All Keys function is performed...then if I need to cut every other
keyframe, I could just enter a scale value of .5 and chop the scene in half.

Anyone have a simpler way to delete these extra keyframes than manually
deleting each one by hand?

                                     -David Warner
                                      Event Horizon Graphics

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