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Effects optic movement speed help

Posted: Sat, 6th Sep 2008, 12:30am

Post 1 of 11

Mefuneakira

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Hi all.

Goal: To match tail lights with car while moving away

Problem: Effect optic movement delays as it moves, instead of a constant speed. (Example Below)

Question: Why does Effect optic movement start slow, speed up and then slow down towards the last origin point? How can I adjust/change the optic speed of the moving effect to be constant?

Thanks for any help!

Mefune Akira

Example:

Posted: Sat, 6th Sep 2008, 1:50am

Post 2 of 11

Qbeck

Force: 1210 | Joined: 16th Apr 2007 | Posts: 117

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you key framed the first and the last frame i'm guessing, and then car doesn't go straight up, it slowly goes at an angle, with the optic doesn't know that. If you only did 2 keyframes, try to add more
Posted: Sat, 6th Sep 2008, 2:19am

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Axeman

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SuperUser

Its a matter of perspective. If you were actualy to physically measure the distance the car's light travels from fram 1 to frame 2, and compare that to the distance between frames 21 and 22, you would see that when the car is closer to you, it moves farther in 2-dimensional space. The farther they are from you, the smaller distances appear due to perspective. The answer is indeed to add more keyframes. For perfect results, you are probably going to need to do every frame, as the distance the light travels will get incrementally smaller for every frame that passes.

If you had a shot from directly over the car, looking down on it, you could keyframe the first and last shots and be done. Perspective makes everything a bit trickier.
Posted: Sat, 6th Sep 2008, 3:09am

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Qbeck

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yay i feel smart that i got it right biggrin
Posted: Sat, 6th Sep 2008, 5:19am

Post 5 of 11

Mefuneakira

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Thanks for taking the time to reply! Much appreciated.

The issue is still why does movement (side to side and up and down) with FXHome start slow, accelerate, then slow down again as it approaches the final origin point? Even if the Effect remains the same size throughout the frames.

Example:
(66 Frames/Same size)




Example 2:
(Effect is same size and merely needs to move diagonally, but again starts slow, then accelerates)



When I utilize each frame, the effect shakes extremely due to imperfections of trying to maintain the correct position on the car by eye. This confirms for me that the problem is inconsistant speed.

If the effect moved at a constant speed, matching the movements of the car and effect would be easy. So again, is there an option I'm missing that sets the effect movement to begin at one side of the screen and move to the other at a constant speed?

Ive tried to make the effect's duration longer than the footage, but the effect movement slows in the middle frames. Ive tried to 'right click faster speed' the effect, but is still an inconsistent speed.

Am I missing something here?

Thanks again.
Posted: Sat, 6th Sep 2008, 5:29am

Post 6 of 11

Axeman

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SuperUser

For general animating and motion graphics type of work, there is a built-in 'smoothing' control that mimics the 'slow in, slow out' technique used in traditional animation since the 30's. Especially when an effect is changing direction, adding more frames closer together around the feyframes tends to make the movement smoother and more visually pleasing.

As you have discovered, this is not always the case. There are some instances where it is preferrable to prevent this. The "Tween Strength" control is where you can alter this behavior to suit your needs.
Posted: Sat, 6th Sep 2008, 6:27am

Post 7 of 11

Mefuneakira

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Axeman wrote:

For general animating and motion graphics type of work, there is a built-in 'smoothing' control that mimics the 'slow in, slow out' technique used in traditional animation since the 30's. Especially when an effect is changing direction, adding more frames closer together around the feyframes tends to make the movement smoother and more visually pleasing.

As you have discovered, this is not always the case. There are some instances where it is preferrable to prevent this. The "Tween Strength" control is where you can alter this behavior to suit your needs.
What/How exactly do I adjust the "Tween strength"? The only options I see in "Effects optic movement" is a variable of 1 or 0. Origin 1 (1) to Origin 2 (1) = Same result. Origin 1 (0) to Origin 2 (0)= Same result. Origin 1 (1) to Origin 2 (0)= Same result. Origin 1 (0) to Origin 2 (1)= Same result.

( ( ) = Tween variable )

I see no difference with the available Tween option.

Help? lol

Last edited Sat, 6th Sep 2008, 6:57pm; edited 1 times in total.

Posted: Sat, 6th Sep 2008, 3:38pm

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Mefuneakira

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Anyone?
Posted: Sat, 6th Sep 2008, 7:37pm

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Axeman

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SuperUser

Sure enough, seems to be a bug. The Tween (short for inbetween) Strength setting seems to have no effect at all.
Posted: Sat, 6th Sep 2008, 8:01pm

Post 10 of 11

Mefuneakira

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Axeman wrote:

Sure enough, seems to be a bug. The Tween (short for inbetween) Strength setting seems to have no effect at all.
So now what? Nothing can move left to right in FXHome in one constant speed?
Posted: Sun, 7th Sep 2008, 10:11pm

Post 11 of 11

Mefuneakira

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Hello all!

Im still looking for an answer to the problem.

(Movement at a constant speed)