Wanted to share this tutorial I made on realistic reflection in the new Advanced 3D renderer.

Hope it’s helpful!

https://www.youtube.com/watch?v=uuQNiLdPCvM

Here’s the Final Version of the expression I came up with in case it helps someone.

// ---------------------------------------------------------
// Replicate Auto-Orient > Along Motion Path
// Apply Expression to 3D 'Orientation'
// ---------------------------------------------------------

// FUCNTIONS //
function arraysEqual(a, b, eps){
    for(var…

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Here’s a cleaner expression of the 3D version I replied earlier:

// Auto-Orient along Motion Path //
var eps = 0.0001;
var step = thisComp.frameDuration;
var deltaT = step;
function len(v){return Math.sqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);}
var v = position.velocityAtTime(time);
// --- Case 1: Layer is moving this frame ---
if(len(v) > eps){
…

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Is there an expression that mirrors the behavior of Auto-Orient > Along Motion Path? It appears to be more than just lookAt(position, next potision + velocity).

Is there one that mimics the behavior exactly?

Mike

In case anyone is interested, I made a graphic to show the pixel/mm relationship

I know this is an old thread, but I recently made a script called Tracker Solver that allows you to add 3D nulls in custom locations after solving the camera in After Effects.

Here’s a short video on how it works:
https://www.youtube.com/watch?v=YZnQF2DVhc8

1-Minute Demo: https://vimeo.com/1088205886

Download the script: https://www.mikesevigny.com/scripts

Give it a try and let me know what you think

In After Effects 2025, you can “Save as..” and select “Save a Copy as 24.x”

I’m attempting to track Alexa Mini LF footage with Cooke Lenses without the metadata (*.dat) that is usually provided with this setup.

It was shot as ‘LF Open Gate ProRes 4.5K’ (4480 x 3096) with a x2.0 anamorphic squeeze. Lens info was also lost but I know that they were all Prime Cooke Lenses (still some guess work on that front). The sensor…

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