Welcome to the world of After Effects! I hope you enjoy it.
You will enjoy it a lot more if you learn the basics first before you start trying to do complicated things, just so you know. AE is a professional program that requires a lot of learning. Here is the bit in the manual for your issue.
www.videocopilot.net/basics and http://library.creativecow.net/tutorials/adobeaftereffects are both good places to find tutorials. Start with the basics, read the manual, then work your way up. That way it'll be fun instead of frustrating.
You'll need to change the keyframes to have a spatial interpolation type of linear instead of the default bezier. Here is a good document in the AE help:
Thanks for your answers and Yes, I will learn the basics.
But the tip about Spatial... and set it to Linear worked great. But now another problem arrised:
Im moving my camera backwards in high speed away from an object. Then I set a keyframe and move the camera further away slowly so at first it moves backwards fast and then slows down and then I add a last keyframe so it stands still.
BUT... it works fine til in the middle of the two KF where it goes slowly backward but then it suddenly moves forward and then stops..!!?? This only occurs when I forst move camera fast and then slow. It looks something like this in the timeline:
KF----------Moves fast backward---------KF------Moves slowly backward------KF(stops)
But in the middle of "Moves slowly backward" it turns and moves slightly forward and stops. Why is that?
I'm not sure I understand the exact problem,
but if there's unexpected motion -
make sure that there aren't more keyframes in the timeline than you think there are?
You can select one and then hit delete
It sounds like you still need to change the interpolation of some of your keyframes to "spatial".
- Select all of your keys in the timeline
- Right-click on any one of the selected keyframes
- Choose "Keyframe Interpolation"
- Selecte "Linear" in teh Spatial Interpolation pulldown menu
You can do this in the graph editor as well as mentioned by Szalam.
You select keys in the Value Editor, and hit the "Convert selected keyframes to linear" button.
If you haven't already changed the default behavior in the general preferences, you may want to do so.
Changing the preference only effects keyframes created after you toggle the preference.
You may need to set the temporal interpolation to linear as well, or adjust the tangents in the graph editor. Bezier curves can "overshoot" in cases when you go from very fast to slow or vice versa.