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I've made an Object containing three points. Via GN I've generated an Arrow by sampling index 0 and 1 as you can see in the screenshot.

I want to switch the direction of the arrow by changing die Index at the sample index node.

  • 0, 1 = everything works fine
  • 1, 0 = no line at all
  • 1, 2 = messy result

Maybe you have an idea?

enter image description here

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  • $\begingroup$ You can upload the file here: blend-exchange.com and follow the instructions there to edit it into your question. $\endgroup$
    – Gordon Brinkmann
    Commented Oct 17 at 7:50
  • $\begingroup$ Code review and bug hunting are off-topic to this site, try asking on blenderartists.org or discord. I know this is harsh but a post like this doesn't benefit future visitors. $\endgroup$
    – Markus von Broady
    Commented Oct 17 at 8:07

1 Answer 1

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I suppose, you use Curve Line node in direction mode, while inputs are global coordinates. To make a direction, subtract the second position from the first.

enter image description here

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  • $\begingroup$ Thank you. Exactly that was the Problem. I used the secon vector as Direction vector. Embarrassing :( $\endgroup$
    – tilation
    Commented Oct 17 at 19:10

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