How to rotate each instance individually based on its index in the list?

Question

I can rotate instances by a specific amount. What I can't figure it out, is the way to rotate each instance, around its own normal with a specific amount for its rotation. I want to rotate each cube in this example by 5 degrees, this means, the first index(0) should have rotation = 0, and index(1), should have a rotation amount of 5, and so on. This rotation only happens around instance normal, or local axis. I don't know how to create a for loop in the Geometry node and for each instance apply something like (i + 5 degree). I appreciate any help here.

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And here is the example that I tried to incorporate index:

Answer 1

The easiest way might be to simply use a curve created with Curve Circle as a base and convert it into points. This way you get the necessary rotation as a starting point.

The circle is best created with a defined number of points, and if you divide $2\pi$ by this number of points, you get an angle that you can multiply directly with your index.

If you then combine the previously obtained rotation with this calculated angle in the node Rotate Euler (Local), you will get exactly the rotation you are looking for for your instances.

_{PS: I've hidden the sockets/options here to save space, in case you're wondering where the inputs/outputs went.}

_{(Blender 3.1+)}

Answer 2

Here I found it. Multiply the index with the degrees you wanted in the y-axis

Hope it helps.