How to make highlights have a sense of direction?

First half of the video: What I want. The little rectangular prisms look like they’re pointing down.

Second half of the video: What I have now. It looks flat and two dimensional, I can’t tell which way they’re going.

So how could I make it, so the highlights have a sense of direction? Or maybe something else can be done? Thanks!

The ‘FillTransparency’ property of the highlight has one color only, meaning it will look flat. Although if I’m not wrong, you could achieve the effect that I believe you wanted with Cel Shading techniques:

I don’t think those fog settings exist, at least I couldn’t find them :p
Thanks for the suggestion though :D

maybe change the shape? Make them more like triangles that get thinner on one side? (or perhaps use arrows?

I think when they are semitransparent, it allows for a decent sese of depth.