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Having opacity of objects be controlled by camera position
Greetings,
I have scene where there are floating screens (all objects are 3d layers) with a camera. What I’d like to happen is the following… the closer I move the camera to any object, the more opaque it becomes. When the camera pulls away from it, the object becomes transparent. Let’s say, it never drops below 20% opacity and never goes over 90%.
If this makes sense, please let me know if and how this is possible. I’m sure there’s an expression that controls it all, but I’m not very good at code. I did a search on the interwebs, but didn’t quite find the solution for what I need.
Any help, links, tutorials, etc. are welcome! Thanks everyone,
Redpandavfx
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5 Replies
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Here’s something to start with. Copy and paste this code to your layer opacity.
20+1.1*thisComp.layer(“Camera 1”).transform.position[2]
As long as your camera’s z-position is greater than 0, you’ll get a minimum opacity of 20%. You can adjust the “1.1” property in the code to change the rate of opacity change in relation to camera distance.
I’m not sure how to set the maximum opacity to 90%. I’m kind of a newbie to expressions.
Hope this helps a little.
Bob
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The example expression in the “Expression example: Fade opacity of a 3D layer based on distance from camera” section of After Effects Help should do what you want. Just replace the 100 and 0 in the last line with 90 and 20.
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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Hi Todd, someone’s been messing with one of the links from the page that you provided – https://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-7a16a.html
The link is from the position between two layers thingy.
Cheers
RoRKbroadcastGEMs – AEPro Volume 02 (Professional Adobe After Effects Project Files – Now Available).
Adobe After Effects Training in South East Asia.
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You guys are awesome! Thank you very much… the combo of the above methods totally helped me.
Super thanks!
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Andrew Kramer also has a neat preset called 3d Falloff on his website.
https://www.videocopilot.net/tutorials/3d_falloff/
it work pretty well, you might want to give that a shot
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