MPH in Tempo
<First, set up the path as you would expect (probably with <a key at points A,
B, and C). Make sure there are plenty <of frames in the animation (path), scale
time if necessary.
<Go into TEMPO and enter the velocity curve editor. Set the <velocity curve to
be flat at 55 mph for the entire <animation. Click OK to apply it (make sure
fit to path is <NOT on).
<Now go into the preview dialog to see at which frame the <car passes point B.
We'll call this frame f.
<Now go back into the velocity editor and set the start of <the active segment
to frame f and place a node there at <55mph (Make sure the end of the segment
is the last <frame). Add another node somewhere between the previous <node and
the last node at 45mph.
<Switch edit mode to 'Move Point' and click on the node you <just made. Now
what you want to do is move this node <horizontally (leaving it 45 mph) to get
the 'New Track <Length' to equal the 'Original Track Length'. When you get <it,
click OK. Again, make sure 'Auto Fit To Track On Exit' <is OFF.
This is the response you sent me to my message on using tempo. Here's what I
have done.
I did what you indicated. Set the path of the car and added key grames at point
A, B and C. In tempo I set to 55 mph constant. Then I noted where the car
crossed points a and b. (38 and 71 respectively) Set velocity curve to active
segment start at 38. Added a point at 38 at 55 mph. Added another point at 71
going 44 mph (speed at point of initial impact which occurs at frame 71).
You then told me to move this 44 mph point horizontally to set the new track
length = to original. Moving it horizontally didn't change new length at all. I
had to add another point between C and the end fram and move them to 0 mph
(moving both hor. & vert) to get new track = to original.
Everything seems to have worked out OK. Just wanted to tell you what I wound up
doing differently to see if you told me wrong, or if I ran into a different
problem then you thought.
Interested in hearing more from you. Thanks for the help.
Paul