# Specify distance between planes along an arc

**URL:** <https://discourse.shapr3d.com/t/specify-distance-between-planes-along-an-arc/7153>\
**Category:** Modeling Questions\
**Created:** [April 10, 2020, 8:06pm UTC](https://discourse.shapr3d.com/t/specify-distance-between-planes-along-an-arc/7153 "2020-04-10T20:06:17Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![NetWhiz](https://avatars.discourse-cdn.com/v4/letter/n/dec6dc/32.png) [@NetWhiz](https://discourse.shapr3d.com/u/NetWhiz)\
**Post date:** [April 10, 2020, 8:06pm UTC](https://discourse.shapr3d.com/t/specify-distance-between-planes-along-an-arc/7153/1 "2020-04-10T20:06:17Z")

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I saw [this thread](https://discourse.shapr3d.com/t/combine-loft-and-sweep-tool/5988/2) about making a design plane to a point along an arc. How would you go about making sure each plane is a specific distance from another one? So when you add an object to each plane they match the plane angle and are the specific distance? As you can see, I am trying to make eyelashes around the eye along a curve.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/a/a02d730c9cc9fc421d93124a2cef632dea16cae4.png)

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**Author:** ![brandon-ase](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/brandon-ase/32/34791_2.png) [@brandon-ase](https://discourse.shapr3d.com/u/brandon-ase)\
**Post date:** [April 10, 2020, 8:19pm UTC](https://discourse.shapr3d.com/t/specify-distance-between-planes-along-an-arc/7153/2 "2020-04-10T20:19:07Z")

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Did you mean to ask me or SHAPR?

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**Author:** ![DanielR](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/danielr/32/582_2.png) [@DanielR](https://discourse.shapr3d.com/u/DanielR)\
**Post date:** [April 10, 2020, 8:22pm UTC](https://discourse.shapr3d.com/t/specify-distance-between-planes-along-an-arc/7153/3 "2020-04-10T20:22:49Z")

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Hey

1. Create rectangles
2. Lock in their dimensions and make them horizontal/vertical
3. Lock the distance between two of their points
4. Snap their mid-point to the arc

here is a video: [https://share.getcloudapp.com/OAubK8rZ](https://share.getcloudapp.com/OAubK8rZ)

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**Author:** ![Gelphyn](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@Gelphyn](https://discourse.shapr3d.com/u/Gelphyn)\
**Post date:** [April 10, 2020, 9:07pm UTC](https://discourse.shapr3d.com/t/specify-distance-between-planes-along-an-arc/7153/4 "2020-04-10T21:07:25Z")

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@NetWhiz  
I interpret your requirement slightly differently and again this is only another way of achieving an objective.

Assuming that you have a Circular Curve [Circle or Segment of a Circle] and you wish to divide it equally and add Planes at a specific Angle.

This is one way of achieving the objective.  
In this case it is dividing one quarter of a Circle into 8 equal parts, 90º ÷ 8 = 11.25º. Sketch a Radius Line and use **Transform \> Move/Rotate** \> Hit the **✚ Icon** to pivot the Line from the Centre of the Circle typing in the Angle.  
Repeat as necessary:

 ![IMG_1746](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/5/5ed02b52ded5be5673446fbbc1e4bae7dce8b7f7.jpeg)

Use **Add \> Construction Plane** [CP] \> Choose **Perpendicular from Point** place a CP on the end of each Radial Line:

 ![IMG_1747](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/0/0e17cc09ec7c49db7101c852a37cdc50407349dd.jpeg)

Use **Transform \> Move/Rotate** To adjust the angle of the Plane(s) to the desired degree, these have been set to 40º:

 ![IMG_1744](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/4/42e04439852827c68328564b701396e817f94271.jpeg)

Assuming the need is to divide a Curve/Arc equally, S3D provides sufficient information for the maths to be done:

 ![IMG_1748](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/8/83fd5b0e69d8bf212b04c91eb7096382f27d45df.jpeg)

If the task involved something more complex I would divide a combo Curve using a series of Circles on a trial and error basis, but this would only provide an approximation:

 ![IMG_1749](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/5/5d6985035ba61360a19d94511741792a81a199a0.jpeg)

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<div class="post-metadata">

**Author:** ![NetWhiz](https://avatars.discourse-cdn.com/v4/letter/n/dec6dc/32.png) [@NetWhiz](https://discourse.shapr3d.com/u/NetWhiz)\
**Post date:** [April 10, 2020, 9:45pm UTC](https://discourse.shapr3d.com/t/specify-distance-between-planes-along-an-arc/7153/5 "2020-04-10T21:45:34Z")

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In the image I posted, I want the spacing between the centers to be the same. I want the center vertical line of the each rectangle to be perpendicular to the arc.

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**Author:** ![Gelphyn](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@Gelphyn](https://discourse.shapr3d.com/u/Gelphyn)\
**Post date:** [April 10, 2020, 10:42pm UTC](https://discourse.shapr3d.com/t/specify-distance-between-planes-along-an-arc/7153/6 "2020-04-10T22:42:14Z")

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@NetWhiz  
Choose the Arc and move the Point as required