-
Fractal Noise Stars – Parent tracking data issue
Hi there,
I am compositing a night time sky replacement in After Effects.
The replacement sky I am comping in is a black solid, with a fractal noise configured to look like stars. The stars slowly twinkle, using two key frames on the rotation field in the fractal noise effect. As per many AE and found online.
The shot is motion tracked successfully. The position tracking data is on a null in the comp.
This is where it gets weird. As soon as I parent the black solid (containing the fractal noise stars) to the tracking data null – The stars all fire around the place erratically when the comp is played down.
Pre compositing the solid does not help.
I’ve even tried rendering the black solid with twinkling stars as a .mov. When I parent that instead of the solid it does the same thing! I’m baffled.
Both the solid and .mov play fine when not parented to the tracking data null.
Any help would be incredible. I am sure it is something silly and obvious!
replied 1 week, 1 day ago 3 Members · 6 Replies
-
6 Replies
-
hey man! in order to solve this 100%, i just need to know:
is the tracking null itself parented to anything, or does it have Scale/Rotation values in addition to Position?
If you tell me how you created/applied the track (e.g. Mocha, AE 3D Camera Tracker, point tracker, position track) and whether the null has Position only or Position + Scale/Rotation.
Lemme know, don’t panic, i’ll give you the solution after your response.
Or if you can, send me the projet file, and i’ll send it back fixed for you in a minute. thx!
-
Hey John, thanks for the response!
Project file attached. The main asset (BG Plate) will be offline of course but shouldn’t matter for seeing the problem. Super interested to see what you think.
-
hey Matt i recorded a tutorial with the solution and attached the fixed project file in the description, i hope you like it! 🔥
-
You sir are an absolute legend! Thank you so much. I really appreciate the lengths you have gone to solve this for me. Can’t thank you enough.
-
Adding on to the above, your tracking is fine, you just have a very very large composition. if you zoom out the shot out to 100%, the stars stop jumping around. If you put this composition into your final comp, if it’s standard aspect and used as the background, it will look fine.
-
Yes thank you John C. John M above went through several fixes in his video above – all of which explain the resolution / comp size issue. Thanks for the responses guys!
Reply to this Discussion! Login or Sign Up