Return to Answer

If it's not too late, perhaps it's easier to defer the conversion of Curve to Mesh, and let Geometry Nodes do it for you, if you need to do it at all.

Then, when using the Curve to Points node, you have access to the curve's Tangent and Normal attributes in the GN tree, and the Rotation convenience combination, which interprets the curve's tangential direction at the points as Z:

This also leaves you the option of resampling the curve, changing the curve's own profile if you want to display it as a mesh, and so on.

Align Instances to Curve

If it's not too late, perhaps it's easier to defer the conversion of Curve to Mesh, and let Geometry Nodes do it for you, if you need to do it at all.

Then, when using the Curve to Points node, you have access to the curve's Tangent and Normal attributes in the GN tree, and the Rotation convenience combination, which interprets the curve's tangential direction at the points as Z:

This also leaves you the option of resampling the curve, changing the curve's own profile if you want to display it as a mesh, and so on.

If it's not too late, perhaps it's easier to defer the conversion of Curve to Mesh, and let Geometry Nodes do it for you, if you need to do it at all.

Then, when using the Curve to Points node, you have access to the curve's Tangent and Normal attributes in the GN tree, and the Rotation convenience combination, which interprets the curve's direction at the points as Z:

This also leaves you the option of resampling the curve, changing the curve's own profile if you want to display it as a mesh, and so on.

If it's not too late, perhaps it's easier to defer the conversion of Curve to Mesh, and let Geometry Nodes do it for you, if you need to do it at all.

Then, when using the Curve to Points node, you have access to the curve's Tangent and Normal attributes in the GN tree, and the Rotation convenience combination, which interprets the curve's tangential direction at the points as Z:

This also leaves you the option of resampling the curve, changing the curve's own profile if you want to display it as a mesh, and so on.

If it's not too late, perhaps it's easier to defer the conversion of Curve to Mesh, and let Geometry Nodes do it for you, if you need to do it at all.

Then, when using the Curve to Points node, you have access to the curve's Tangent and Normal attributes in the GN tree, and the Rotation convenience combination:

This also leaves you the option of resampling the curve, changing the curve's own profile if you want to display it as a mesh, and so on.

If it's not too late, perhaps it's easier to defer the conversion of Curve to Mesh, and let Geometry Nodes do it for you, if you need to do it at all.

Then, when using the Curve to Points node, you have access to the curve's Tangent and Normal attributes in the GN tree, and the Rotation convenience combination, which interprets the curve's direction at the points as Z:

This also leaves you the option of resampling the curve, changing the curve's own profile if you want to display it as a mesh, and so on.