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Please have a look at this video. My question is, how can I make the animation in the video? Of particular interest is the selection of the region between two curves (delimited by the two parallel lines) and then extruded with rotation. Thank you in advance.

Here is a screenshot of the effect on video: video screenshot

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    $\begingroup$ Hello please don't right in capitals. You could do this animation with the Screw modifier for example $\endgroup$
    – moonboots
    Commented Sep 9, 2022 at 19:58
  • $\begingroup$ Thank you foryour suggetion.Anyway How to select the red region , because only after selecting the region I can apply the Screw modifier.Please helpme to select the red region.Thank you. $\endgroup$ Commented Sep 9, 2022 at 20:05
  • $\begingroup$ You'll need to create the 4 curves (for the 4 colored lines), a mesh that is the red shape, and a second mesh that is a copy of the red shape except you don't fill the face. Give the Screw modifier to this last object $\endgroup$
    – moonboots
    Commented Sep 9, 2022 at 20:12
  • $\begingroup$ Honestly I'm not able to make this Animation , because I made 2 bezierCurve and for strait line I use 2 NurbsPath ,now I can't fid the way to intersect them i order to get the region to select .So please help me out. $\endgroup$ Commented Sep 9, 2022 at 21:09
  • $\begingroup$ What do you mean by "intersect"? The red object is just a new object. For the curve animation (growing) use a bevel object and the Start and End Mapping values: youtube.com/watch?v=L9O14_6wALk $\endgroup$
    – moonboots
    Commented Sep 9, 2022 at 21:16

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Once you've created your 4 curves, duplicate them, join the duplications with CtrlJ, right click > Convert to > Mesh:

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In the Options panel enable the Auto Merge option and Split Edges & Faces (if you don't find this panel open the N panel > Tool > Options):

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Now press G and Enter right away, it creates 4 vertices at the intersections of the edges:

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Remove the useless vertices:

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Duplicate the mesh, fill one version, use the other version to create the revolution effect with the Screw modifier (make sure to place the origin of the object at the center of the rotation, keyframe the Angle value to animate:

enter image description here

For the growing effect of your 4 initial curves, use the Bevel and the Start & End Mapping values as explained here.

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