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I have a question here.

I'm doing an animation where there's a glowing line coming out from a globe (like what in the video down below), but i don't know how to do the exact effect in Blender. Glowing Line

I tried some glowing shader on a curve but how do I make the line move from spot to spot? do i have to make a trace or something? thank you guys.

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Animating the front of the curve

Assuming, as you say, that you have already created your Bezier Curve, all you need to do is:

  • make sure that the Curve has a Fill Type = Full and a Bevel Depth greater than zero

  • animate the Bevel End value using keyframes, from 0 at the start frame to 1 at the end frame.

enter image description here

Shading

You say that you have already found a shading solution. Let me share my solution anyway:

  • Enable "Use UV for mapping" in the Curve properties.

  • Use this node setup (the "Add" node is from "Converter > Vector Math").

    enter image description here

  • Animate the Y coordinate of the Combine XYZ node. This will allow you to create the moving blobs of light along the line.

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  • $\begingroup$ Thank you for your amazing demonstration! That is very clear and well-explained!! I learned a lot from you and thank you a lot! :-) May I have another question here? Can I remove the shadow of the curve on other objects? $\endgroup$
    – Bowei Yang
    Commented Jan 11, 2019 at 12:41
  • $\begingroup$ Glad it helped! For the shadow, there is a "Ray Visibility" panel in the "Object" properties window. Uncheck "shadow": done! $\endgroup$
    – Nicola Sap
    Commented Jan 11, 2019 at 12:48
  • $\begingroup$ You are a lifesaver, Nicola! Thank you so much :-) $\endgroup$
    – Bowei Yang
    Commented Jan 11, 2019 at 23:02

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