3D Solid with progressively increasing opacity along Z-Axis?

Question

Hello community!

I'm working on a 3D comp with a bunch of black tiles scattered along the XYZ axis, which are supposed to get whiter the farther away they are from a camera that moves along the Z axis.

The way I want to achieve this is with some sort of white 3D cube parented to the camera which has 0% opacity at Z position 0, and progressively reaches 100% opacity at its maximum Z position (let's say 5000, AKA the opposite end of the cube). Is there any way to do this? Thanks a lot in advance!

I've attached an image that better showcases what I want to achieve for the cube so that you can get a better understanding of what I mean, & a handmade reference of the final result.

Mylenium · Answer

That makes no sense at all. You would simply measure the distance with length(camera,layer) and tie that into a linear() function or an effect that controls color/ fill opacity internally. The logic is basically just the other way around. you have the layer looking for the camera. something like this would be a simple start:

mCam=thisComp.layer("Camera").transform.position;

mPos=thisLayer.transform.position;

dNear=0; //closest distance

dFar=5000; //farthest distance

oNear=0; //start opacity

oFar=100; //end opacity

mDist=length(mCam,mPos);

linear(mDist,dNear,dFar,oNear,oFar);

Mylenium

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