Geometry Nodes Random Bezier Instance on Points

Question

I'm just trying to instantiate some varying Bezier segments on the points of a mesh. I've figured out how to get different values for the loft paths I am instantiating.

I'm having problems rotating the loft profile in the direction I want (away from the center).

I generate the loft paths using these nodes. Basically, I instantiate 2 point-Bezier on a Poisson disk and then offset them to randomize them.

Here is a picture showing the loft paths:

This is my simple curve to mesh:

I'm using this loft profile:

And I want the loft profile to point in the same direction as my loft paths, but all I seem to be able to do is make them point in the same direction:

---

LAST UPDATE: Here is the complete node tree in a screenshot. It allows for a really wide variation of plant like single stalked clumps.

Answer 1

To align the individual curves in the right direction, you would have to work with the Curve Tilt of the curves in this case.

You can solve this as follows:

1. Capture the position of the instantiated curves with Capture Attribute in the attribute domain Instance. In your case this is relative to a certain other object.
2. Then simply calculate the angle between these vectors and any other vector. In this case I use $(1,0,0)$. Since these two vectors are in 2D space, this can be done using $arctan2$.
3. The generated angle can then be used directly in the node Set Curve Tilt, which will rotate the curve profile to the center accordingly and use it with Curve to Mesh.

_{(Blender 3.4+)}