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enter image description here

I want to model pagoda roof like this picture by using modifier, not by manually placing each rafters one by one.

anyone have idea about this?

P.S : don't recommend array, curved array, object offset.

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For the moment, this is just an 'in principle' suggestion, to create a mesh, proportionally edit it to shape, and extract the relevant edges from it to be converted to a curve.

The curve's native bevel can be adjusted to the width of the ridges.

How you construct the original mesh, its topology, will depend on whether the ridges should splay, or be parallel, whether they are allowed to curve along their length, etc.

If you want help with that, maybe you could put up a reference image.

enter image description here

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What you could do is use Instancing (Duplifaces in 2.7), a bit different from a simple Array + Curve as it won't distord your object:

  • Create a curve that follows the roof shape, put its origin at its beginning.

enter image description here

  • Create a plane, scale it as necessary, apply scale and rotation, make it follow the curve with Array + Curve modifiers.

enter image description here

  • Keep your plane selected and in the Properties > Object > Duplication (Instancing in 2.8), choose Faces. It means that the object that will be parented to the plane will be duplicated on its face.

enter image description here

  • Create your trunk, put its origin on one of its extremities, then put it on the exact same point as the curve origin, parent it to the plane, it will duplicate along (in my case it would need more plane to stick to your example though).

enter image description here

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You can use an Array Modifer to help place most of the rafters by creating a curve that the rafters can array onto.

First, add a curve to the scene and shape it the way you want. Second, build a rafter. Third, add an Array Modifer to your rafter. Next, add a Curve Modifer. Select your "object" as the curve you added to the scene. The rafters should array onto your curve now. You will probably need to have multiple different curves to achieve the structure shown in your photo.

Starting at 4:45, this video shows the process: https://www.youtube.com/watch?v=YQ8chdrYn-8

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    $\begingroup$ you can't. it will distort mesh. and rafters in pictures are not arranged in same distance. $\endgroup$ – Yeon Nov 18 '19 at 2:53

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