How do I scale instances from big to small from top to bottom without using index?

[Yeet]

I have this project of making a tree in geometry nodes. Of course, there were problems along the way since I’m trying to learn geometry nodes with this project. I solved some of the problems. But now I need to scale my branches. For some reason when I use the index node, the instance just disappears. If anyone can help, I will be very grateful. I will try to post my .blend file here. The tree model is named Sakura.

Warning: blender gets very buggy when you start using Main_Branch and Branch as instances.

[zeroskilz]

This thread is full of good resources:

GeoTree: Procedural Trees in Geometry Nodes

And here it is, GeoTree 0.67. I wasn’t able to quite fix the problem with the branch scaling, but I did maybe possibly smooth it up a little tiny bit. Really, I’m going to need to reanalyze my entire scaling approach, since it seems to be fairly easy to break if stretched too far. As for the rest, this tree is now using Stick Power, and is thus constructed slightly differently than the previous trees, with fewer branches on average. I did leave the option to draw the leaves on the sticks to emu…

Basically you’re using the Factor from the 1st curve to control the scale of instances:

Good luck.

[Yeet]

Thank you very much for the advice, it worked. I also needed to change Blender version from 3.1.2 to 3.3.1, but it thankfully didn’t break anything. And also thank you for the thread, I’ll be going on it a lot I think.