How to set rotation of gradients on beams?

I want to have the bottom half of the beam be brown, and go to white towards the top. However, it only goes left to right.

Simple: add another keypoint at the end and make it brown, then add a keypoint in the middle and make it white.

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That’d just make the ends brown, and the middle white. I don’t want horizontal, I want vertical. So the bottom of the beam should be brown, top white

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Except obviously a smooth gradient between

You can only make it go left to right, you cannot make it go top to bottom.