# How to partially raise shape that’s projected onto non-planar cylinder?

**URL:** <https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560>\
**Category:** Modeling Questions\
**Created:** [January 12, 2023, 7:50pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560 "2023-01-12T19:50:23Z")\
**Posts on this page:** 14\
**Page:** 1

<div class="post-metadata">

**Author:** ![Jrm1025](https://avatars.discourse-cdn.com/v4/letter/j/67e7ee/32.png) [@Jrm1025](https://discourse.shapr3d.com/u/Jrm1025)\
**Post date:** [January 12, 2023, 7:50pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/1 "2023-01-12T19:50:23Z")

</div>

Hi, fairly new to shapr, so forgive me if there is a basic solution to this question, but how would I go about raising part of a rounded arm shape that’s been projected onto a cylindrical non-planar object? It’s difficult for me to explain, but essentially I am looking for a method to extrude or offset part of the projected shape so that it’s slanted in a way where the arm’s shoulder fades into the body instead of being extruded equally with all of the rest of the arm and sticking out. I am essentially looking for it to fade into becoming part of the main body that it is projected onto. I will include pictures below that might help show what I mean a bit better.  
I  
I

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/5/d/5dccf1f7365501c94fad73afbd64ea880369d2c0.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/5/c/5c6bee7f1e62eb1b079459e6c62e10d225fd4b55.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/f/0/f05b220ede7af79290346503323baa60993bd536.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/a/3/a3fc30790de073fb05c342b17d8aab8341be5919.jpeg)

---

<div class="post-metadata">

**Author:** ![Stephen](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/stephen/32/16350_2.png) [@Stephen](https://discourse.shapr3d.com/u/Stephen)\
**Post date:** [January 12, 2023, 9:22pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/2 "2023-01-12T21:22:00Z")

</div>

It looks like you extruded the arm as a New Body already. It should be easy enough to rotate it so the upper or lower part goes into the main body.  
Nice concept btw, I like what you are doing.

---

<div class="post-metadata">

**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [January 12, 2023, 9:25pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/3 "2023-01-12T21:25:02Z")

</div>

Yes, the problem with Projecting a sketch on a non-planar surface is that it can become distorted, and, the extrusion is normal to the surface all around which I think is what you don’t want.

In this video I first show the method of projecting a sketch.  
A second approach is to extrude a body into the non-planar surface and use **Replace Face** to bring it flush with the contoured surface. Move it outward, add a fillet radius and adjust the distance to the non-planar surface to suite. Afterwards you can do a union if you like.

[https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/8/0/80a02a4f2307914697a3a98cb7f293e2a77a725a.mov](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/8/0/80a02a4f2307914697a3a98cb7f293e2a77a725a.mov)

---

<div class="post-metadata">

**Author:** ![Stephen](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/stephen/32/16350_2.png) [@Stephen](https://discourse.shapr3d.com/u/Stephen)\
**Post date:** [January 12, 2023, 9:27pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/4 "2023-01-12T21:27:31Z")

</div>

Good work as usual Mike 👍

---

<div class="post-metadata">

**Author:** ![Jrm1025](https://avatars.discourse-cdn.com/v4/letter/j/67e7ee/32.png) [@Jrm1025](https://discourse.shapr3d.com/u/Jrm1025)\
**Post date:** [January 12, 2023, 9:45pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/5 "2023-01-12T21:45:11Z")

</div>

Thank you! Just wanted to play around with a few things and that’s what I came up with. I also attempted to rotate it and that kind of worked as a workaround, but I couldn’t really replicate it if I tried, so I mostly wanted to learn if it would be possible to extrude at an angle on a non planar surface, but it doesn’t appear so. Thank you for the response though!

---

<div class="post-metadata">

**Author:** ![Jrm1025](https://avatars.discourse-cdn.com/v4/letter/j/67e7ee/32.png) [@Jrm1025](https://discourse.shapr3d.com/u/Jrm1025)\
**Post date:** [January 12, 2023, 9:53pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/6 "2023-01-12T21:53:22Z")

</div>

Thank you for taking the time to replicate it and show me a new method! It looks like I may be able to alter that to get my desired outcome. The main thing I’m still confused on is how I could extrude or subtract from my body non-uniformly so that one side of that extrusion protrudes more than the other. I attempted to show this in my screenshot with the detached arm, but it wasn’t a very good angle. I’ll try to show a better angle, but the shape I’m looking for has a bit of an arc, more so than a uniform extrusion that raises the shape equally on all sides. The shape I’m looking for kind of resembles a screw thread, but with a tapered “shoulder” that blends into the mushroom’s body only on one side of the arm. Sorry for the long winded explanation, I’m still new to this!

---

<div class="post-metadata">

**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [January 13, 2023, 6:47am UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/7 "2023-01-13T06:47:15Z")

</div>

Does this help?

[https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/5/c/5c4dad4db977077b8e1ca114d740331f6233d253.mov](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/5/c/5c4dad4db977077b8e1ca114d740331f6233d253.mov)

---

<div class="post-metadata">

**Author:** ![Jrm1025](https://avatars.discourse-cdn.com/v4/letter/j/67e7ee/32.png) [@Jrm1025](https://discourse.shapr3d.com/u/Jrm1025)\
**Post date:** [January 13, 2023, 3:45pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/8 "2023-01-13T15:45:02Z")

</div>

Sort of - this reference picture might help explain it a little better than I can. I’m basically looking for the top of the arm to fade into the body. I guess another way I could describe it would be that the arm is almost just a contour or slight raise on the body rather than a separate entity. I’m open to any suggestions on how to achieve this look though! Thank you again for your help!

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/0/6/062d0a78c299a03831f5e29f6962bbf3e676c945.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/e/2/e25fc8bb24fce03b8a1b7f96325e3520059a7225.jpeg)

---

<div class="post-metadata">

**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [January 13, 2023, 6:14pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/9 "2023-01-13T18:14:14Z")

</div>

Here I used **Sweep** with a few tweaks along the way. I think that adding separate arm bodies are a better way than trying to extrude from the original.

---

<div class="post-metadata">

**Author:** ![Stephen](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/stephen/32/16350_2.png) [@Stephen](https://discourse.shapr3d.com/u/Stephen)\
**Post date:** [January 13, 2023, 6:41pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/10 "2023-01-13T18:41:35Z")

</div>

Mike, at 00.05 when you rotated the circle and then it moved to the projected line, did you drag the circle over or move it some other way?

---

<div class="post-metadata">

**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [January 13, 2023, 7:06pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/11 "2023-01-13T19:06:31Z")

</div>

I used the **Move-Rotate** tool to tweak the position of the circle before I used **Sweep**. I eyeballed making it somewhat normal to the curved line used in the sweep. Afterwards I moved the new body inwards and then used Scale (not shown) at the top surface to narrow the top of the arm (an aesthetic thing).

---

<div class="post-metadata">

**Author:** ![Jrm1025](https://avatars.discourse-cdn.com/v4/letter/j/67e7ee/32.png) [@Jrm1025](https://discourse.shapr3d.com/u/Jrm1025)\
**Post date:** [January 13, 2023, 7:18pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/12 "2023-01-13T19:18:53Z")

</div>

That is exactly what I’m looking for! I attempted this idea at one point, but your execution of it makes it a lot easier and cleaner for sure. Just out of curiosity, if I were to attempt a similar idea for the feet, it seems like it wouldn’t work well because a line can’t really be projected onto the lower part of the body without curving underneath, but would you suggest a different method, or still sweeping? Or even a whole new base with the extruded feet included in it? I’ll include a picture for reference, thanks again for the video explanations as well!

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/7/2/725fc58f6e0a9e77632263614c61676189e5786d.jpeg)  
As you can see on this image, the feet barely poke out of the body and are slightly arc’d extrusions from the body

---

<div class="post-metadata">

**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [January 13, 2023, 7:35pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/13 "2023-01-13T19:35:37Z")

</div>

This is a bit Q&D but I extruded a body from an ellipse with an enlarged draft angle to make a foot. Then I embedded it to the main body, mirrored the other foot, did a Union followed by a fillet radius.

---

<div class="post-metadata">

**Author:** ![Stephen](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/stephen/32/16350_2.png) [@Stephen](https://discourse.shapr3d.com/u/Stephen)\
**Post date:** [January 14, 2023, 5:26pm UTC](https://discourse.shapr3d.com/t/how-to-partially-raise-shape-that-s-projected-onto-non-planar-cylinder/23560/14 "2023-01-14T17:26:58Z")

</div>

Thanks Mike.