I was playing with creating objects on a spline (following the Dominoes.blend example file) Something I did crashed blender. I reopened the file and I can no longer connect the purple spline socket to a purple spline socket. ??? I tried closing blender and starting from a new file. I opened the dominoes file and added new nodes (spline from object, get spline length) and was unable to connect the purple sockets. sockets!

What does it mean when a socket is faded (transparent)?


  • $\begingroup$ Transparent mean it expects a list of splines, semi transparent means it expect both lists and single elements (The socket is vectroized). $\endgroup$
    – Omar Emara
    Aug 27, 2017 at 10:07

1 Answer 1


The Splines from Object outputs a list of splines by default because a curve object can have multiple splines in Blender. You can see that it outputs a list by looking at the socket transparency.

You have two options:

  • Use a Get List Element node to get the first element from the list.
  • Open the advanced settings of the Splines from Object node and switch the Import Type to Single.

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