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Track Motion Changing Speed
Let’s assume I want a person jumping from a building and landing at the street, let’s assume he can fly.
What I want is the whole fall is fast but when he approaches the ground, he starts speeding down till land very soft.
I set two key frames(start falling + on the ground) and obviusly he follows that patch BUT how could I make him at some point of the fall starts speeding down till land on the ground very soft?
Are there some kind of markers we can add controlling speeding like % as an example?
Thanks.We have so much time and so little to do! / Willy Wonka
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9 Replies
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Insert a Velocity Envelop.
Grazie
Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge -
How?
In that track?
In key frames?We have so much time and so little to do! / Willy Wonka
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Right Click on Event and choose “Insert Envelop” and choose Velocity.
G
Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge -
But if that guy who jumped is just an image and not a video with movement, it means its moviment is created by keyframes so I guess I can’t change an image speed cause it has no moviment, key frames added movement so I guess I have to change key frames speed and not that image speed cause it has no moviment, got it?
We have so much time and so little to do! / Willy Wonka
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Could you just space out the keyframes toward the end of the clip so that it takes longer to move the image from a few feet from the ground to the point where it touches the ground? So keyframe at the top of the building, then another, and the final keyframe. You can also right click on the keyframe to get options other than linear, like slow.
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Spacing out only two keyframes(start/end points) will change the whole speed, the whole fall will be slower or faster and not only in a specific part like middle till the end.
Plus choosing linear/slow etc won’t gimme any speed(acceleration) control, they’re fixed settings.
Even if I added a keyframe in the middle and chose SLOW for it and for the ground one still I’m not controlling speed, it’ll suddently become slow and won’t look like speeding down from 100 to 0 😉We have so much time and so little to do! / Willy Wonka
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What you have in mind is, I believe, the person should jump at normal or greater speed from the top and touches the ground in slow motion.Well, to achieve this split the clip at the point where you want the slow down should start and place it in Track two. Apply diff velocity envelopes to both the tracks.
You can control the speed of track 2 by rendering it separately and importing the rendered clip again and applying velocity envelope.
See my video clip “Still Slower” in Creative cow vegas forum posted two months ago. -
Yep I rendered/imported and changed its speed with velocity envelope BUT what I asked if is there a way to control keyframes speed.
Having to render/import/adding envelop etc is not handy, a simple velocity line to keyframes would be VERY handy 😉We have so much time and so little to do! / Willy Wonka
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There is no “speed” to change. There is the amount of change between the keyframes or the amount of time between the keyframes. You were properly told that to “slow down” the change, make the keyframes farther apart or the amount of change smaller.
This may require adding more keyframes to achieve what you want to do. For example, I’m wanting to go from X to Z over thirty seconds. However, I’m wanting the last little bit to go slower. That’s where you’d add a “Y” keyframe. Once easy way to do this would be to place the “Y” keyframe close to the “Z” keyframe. Then move the “Y” keyframe left so that it’s farther away from Z.
If you do what I just mentioned, you will then see that the speed between X and Y is now faster than the speed from Y to Z. Then you can change the type of keyframe Y is to smooth the transition from the fast speed to the slower speed.
So essentially, start like this:
FFFFFFFFFFFFFFFFFFFF
X ZYou have two keyframes with him falling fairly quickly. Now add keyframe Y
FFFFFFFFFFFFFFFFFFFF
X Y ZNow move the “Y” keyframe left
FFFFFFFFFFFFFSSSSSSS
X Y Z“F” = Fast, “S” = Slow
Edward Troxel
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