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I have been trying to animate a concept logo in a complicated way, but I am not sure what search terms I would use to find the appropriate tutorials on this. Below I have an example setup that highlights the issue.

Let us say that I have an SVG of a donut (a 2d torus) that I imported in, extruded out, and then converted to a mesh. What I want to do is to have a glowing ball draw out the mesh torus.

What I mean, imagine the torus as an analog clock. At frame 0, the ball is at 12'o clock, and I see 0% of the torus. At frame 30, the ball is at 3'o clock and I see 25% of the torus, so on until frame 120 where the ball disappears and I see the 100% of the torus.

I know the basics of Blender well as I have been playing with it for weeks, but I can't seem to figure out how to do this. For the ball, I suspect it will be a simple follow path that I could draw out and sync with the torus growth (I can do this). For the torus, I originally tried to use Boolean Modifiers against the sphere, but the torus does not stay shown once the ball passes over (that would violate "Boolean").

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    $\begingroup$ If I understand correctly, you want some kind of sonar/radar effect where the mesh is revealed by the sweeping motion ? Have you explored a custom shader instead of trying to modify the mesh ? $\endgroup$
    – Gorgious
    Aug 23, 2021 at 8:51
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    $\begingroup$ how does your torus look like? could it be made with an array along a curve? $\endgroup$
    – moonboots
    Aug 23, 2021 at 9:33
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    $\begingroup$ screenshots or a sketch what you like to have would be a great help. And your blend file would help too. $\endgroup$
    – Chris
    Aug 23, 2021 at 11:14
  • $\begingroup$ @moonboots I. have tried the array method prior but it crashed my machine and when it did work, the effect was a bit choppy. Chris's answer below is what I am looking for $\endgroup$
    – TrulySpectacle445
    Aug 24, 2021 at 0:24

1 Answer 1

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  1. Shift-A -> Curve -> Circle

  2. uncheck cyclic

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  1. Tab -> select point -> R -> Z -> rotate like so

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  1. select point -> R -> Z -> rotate like so:

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  1. E -> Shift-Z -> move like so:

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  1. R -> Z -> rotate like so:

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  1. tab

  2. give some depth

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  1. select cirlce -> R -> Y -> 180

  2. keyframe factor end 0 at frame 0

  3. keyframe factor end 1 at frame 120

result:

enter image description here

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  • $\begingroup$ Thanks! Exactly what I am looking for $\endgroup$
    – TrulySpectacle445
    Aug 24, 2021 at 0:25
  • $\begingroup$ You are welcome $\endgroup$
    – Chris
    Aug 24, 2021 at 1:40

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