Why are some material nodes connected to themselves?

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Here's a small thing I've been wondering about for a while: Occasionally, when I import models from other sources (e.g. 3ds Max -> FBX -> Blender), I see in the Node Editor some nodes which are apparently connected to themselves. Like so:



enter image description here



Can somebody explain what's up with that? How is this self-connection useful? How can I do it in Blender?




materials nodes




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    up vote
    8
    down vote

    favorite












    Here's a small thing I've been wondering about for a while: Occasionally, when I import models from other sources (e.g. 3ds Max -> FBX -> Blender), I see in the Node Editor some nodes which are apparently connected to themselves. Like so:



    enter image description here



    Can somebody explain what's up with that? How is this self-connection useful? How can I do it in Blender?




    materials nodes




    share|improve this question






















      up vote
      8
      down vote

      favorite









      up vote
      8
      down vote

      favorite











      Here's a small thing I've been wondering about for a while: Occasionally, when I import models from other sources (e.g. 3ds Max -> FBX -> Blender), I see in the Node Editor some nodes which are apparently connected to themselves. Like so:



      enter image description here



      Can somebody explain what's up with that? How is this self-connection useful? How can I do it in Blender?




      materials nodes




      share|improve this question












      Here's a small thing I've been wondering about for a while: Occasionally, when I import models from other sources (e.g. 3ds Max -> FBX -> Blender), I see in the Node Editor some nodes which are apparently connected to themselves. Like so:



      enter image description here



      Can somebody explain what's up with that? How is this self-connection useful? How can I do it in Blender?





      materials nodes





      share|improve this question











      share|improve this question




      share|improve this question










      asked Aug 8 at 8:19









      Nam-Quang Tran

      685




      685




















          1 Answer
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          The node is not connected to itself, it is muted. You do that to a node by pressing M. The red line indicates a "pass-through" - the input goes straight to output and the node is disabled.



          I would guess the script that creates the node network always makes the full tree and just mutes the nodes that are not used in the original material, like normal mapping in this case.






          share|improve this answer
















          • 1




            Wow, muting nodes is really useful :-D
            – Nam-Quang Tran
            Aug 8 at 9:33










          • Oh, that's right. A node connected to itself would show the connection line a bit differently. That would be wrong. Muted nodes make a lot more sense.
            – Martin Z
            Aug 8 at 13:12










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          1 Answer
          1






          active

          oldest

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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes








          up vote
          12
          down vote



          accepted










          The node is not connected to itself, it is muted. You do that to a node by pressing M. The red line indicates a "pass-through" - the input goes straight to output and the node is disabled.



          I would guess the script that creates the node network always makes the full tree and just mutes the nodes that are not used in the original material, like normal mapping in this case.






          share|improve this answer
















          • 1




            Wow, muting nodes is really useful :-D
            – Nam-Quang Tran
            Aug 8 at 9:33










          • Oh, that's right. A node connected to itself would show the connection line a bit differently. That would be wrong. Muted nodes make a lot more sense.
            – Martin Z
            Aug 8 at 13:12














          up vote
          12
          down vote



          accepted










          The node is not connected to itself, it is muted. You do that to a node by pressing M. The red line indicates a "pass-through" - the input goes straight to output and the node is disabled.



          I would guess the script that creates the node network always makes the full tree and just mutes the nodes that are not used in the original material, like normal mapping in this case.






          share|improve this answer
















          • 1




            Wow, muting nodes is really useful :-D
            – Nam-Quang Tran
            Aug 8 at 9:33










          • Oh, that's right. A node connected to itself would show the connection line a bit differently. That would be wrong. Muted nodes make a lot more sense.
            – Martin Z
            Aug 8 at 13:12












          up vote
          12
          down vote



          accepted







          up vote
          12
          down vote



          accepted






          The node is not connected to itself, it is muted. You do that to a node by pressing M. The red line indicates a "pass-through" - the input goes straight to output and the node is disabled.



          I would guess the script that creates the node network always makes the full tree and just mutes the nodes that are not used in the original material, like normal mapping in this case.






          share|improve this answer












          The node is not connected to itself, it is muted. You do that to a node by pressing M. The red line indicates a "pass-through" - the input goes straight to output and the node is disabled.



          I would guess the script that creates the node network always makes the full tree and just mutes the nodes that are not used in the original material, like normal mapping in this case.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Aug 8 at 9:25









          Jaroslav Jerryno Novotny

          36k164147




          36k164147







          • 1




            Wow, muting nodes is really useful :-D
            – Nam-Quang Tran
            Aug 8 at 9:33










          • Oh, that's right. A node connected to itself would show the connection line a bit differently. That would be wrong. Muted nodes make a lot more sense.
            – Martin Z
            Aug 8 at 13:12












          • 1




            Wow, muting nodes is really useful :-D
            – Nam-Quang Tran
            Aug 8 at 9:33










          • Oh, that's right. A node connected to itself would show the connection line a bit differently. That would be wrong. Muted nodes make a lot more sense.
            – Martin Z
            Aug 8 at 13:12







          1




          1




          Wow, muting nodes is really useful :-D
          – Nam-Quang Tran
          Aug 8 at 9:33




          Wow, muting nodes is really useful :-D
          – Nam-Quang Tran
          Aug 8 at 9:33












          Oh, that's right. A node connected to itself would show the connection line a bit differently. That would be wrong. Muted nodes make a lot more sense.
          – Martin Z
          Aug 8 at 13:12




          Oh, that's right. A node connected to itself would show the connection line a bit differently. That would be wrong. Muted nodes make a lot more sense.
          – Martin Z
          Aug 8 at 13:12












           

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