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Help Drawing a Scalloped Lamp Shade


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It seem to me that the trick is to do it multiple parts. I'd build the top (hemispheric) part as a revolved surface, and then stitch the lower (semi-circular) parts onto it.  Alternatively, you could build a section of the hemispheric top that's a 20-degree revolution, stitch the semi-circle onto that, and then copy-rotate it 18 times, stitching the sections together as you go.

I realize that's not the clearest explanation...let me know if that's not enough to get you started.

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Hello,

Thanks for the morning modeling challenge.  It's always fun to figure this sort of thing out.  Since formZ is powerful in flexibility to do things many different ways, you may find another method more fitting, but here is how I quickly created this in about 5 minutes with some trial and error.

  1. Create a sphere for the diameter of the lampshade (Use the start and stop arrows to create a hemi sphere and skip the need for step 2!)
    image.thumb.png.4ca60d7f751de3999d42b9f1e1b5a0a5.png
     
  2. Or create an extruded box for cutting the sphere and Difference it from the sphere.
  3. Delete the bottom face of the cut sphere and use the Thicken tool to give it a thickness (.125" for example)
  4. Create one of the scallops with 3x the thickness as the lampshade to later use as a splitting shape.
  5. Move the scallop shape up just above the cut edge of the sphere. From the top view, use the Rotate + Mulit-Copy option to rotate enough copies to connect around the 360 degrees of the hemisphere (it took 37 in my example here). Then Union all the copies into one single object.
  6. Boolean Split with Two Way option on the Sphere top and the Scallops.  Delete the extra outside and inside scallop pieces and the sphere piece below the scallops.
  7. Union the remainder together into a single lampshade scalloped object.

image.thumb.png.d2f2493806f7d8bca0c6946d415a360a.png

from the bottom:

image.thumb.png.48df7bb3f21f42aff500f1ea50e39526.png

 

While my method may not be perfect for every use, it should get you going in the right direction.  Good luck!

image.png.275d03101939affbc652ba2e76e0f67c.png

 

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On 10/3/2024 at 5:26 PM, Justin Montoya said:

Hello,

Thanks for the morning modeling challenge.  It's always fun to figure this sort of thing out.  Since formZ is powerful in flexibility to do things many different ways, you may find another method more fitting, but here is how I quickly created this in about 5 minutes with some trial and error.

  1. Create a sphere for the diameter of the lampshade (Use the start and stop arrows to create a hemi sphere and skip the need for step 2!)
    image.thumb.png.4ca60d7f751de3999d42b9f1e1b5a0a5.png
     
  2. Or create an extruded box for cutting the sphere and Difference it from the sphere.
  3. Delete the bottom face of the cut sphere and use the Thicken tool to give it a thickness (.125" for example)
  4. Create one of the scallops with 3x the thickness as the lampshade to later use as a splitting shape.
  5. Move the scallop shape up just above the cut edge of the sphere. From the top view, use the Rotate + Mulit-Copy option to rotate enough copies to connect around the 360 degrees of the hemisphere (it took 37 in my example here). Then Union all the copies into one single object.
  6. Boolean Split with Two Way option on the Sphere top and the Scallops.  Delete the extra outside and inside scallop pieces and the sphere piece below the scallops.
  7. Union the remainder together into a single lampshade scalloped object.

image.thumb.png.d2f2493806f7d8bca0c6946d415a360a.png

from the bottom:

image.thumb.png.48df7bb3f21f42aff500f1ea50e39526.png

 

While my method may not be perfect for every use, it should get you going in the right direction.  Good luck!

image.png.275d03101939affbc652ba2e76e0f67c.png

 

Thank you for such a detailed guide, this worked perfectly! Really appreciate the help and was such a simple solution. 

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On 10/3/2024 at 4:44 PM, Jim_G said:

It seem to me that the trick is to do it multiple parts. I'd build the top (hemispheric) part as a revolved surface, and then stitch the lower (semi-circular) parts onto it.  Alternatively, you could build a section of the hemispheric top that's a 20-degree revolution, stitch the semi-circle onto that, and then copy-rotate it 18 times, stitching the sections together as you go.

I realize that's not the clearest explanation...let me know if that's not enough to get you started.

Thanks for your help, I got there in the end, appreciate all your help!

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Question, how are the scallops created with the same convex surface as the thickened dome prior to unifying them to that object?

Always interested to see how others approach a build.

 

Thanks in advance

Andrew

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18 hours ago, Gyro said:

Question, how are the scallops created with the same convex surface as the thickened dome prior to unifying them to that object?

Always interested to see how others approach a build.

 

Thanks in advance

Andrew

 

2 hours ago, Thommo said:

Question: step 3 / what shape are the scallops

and same question as Gyro

 

Loved that solution.

 

Hi,

The scallop piece is created as an extruded 3d object from a 5 point arc and vector line tool using the extrude 3d option.  Drawn from the front view, and extruded a half inch or so in this example. Then placed just inside the edge of the hemisphere object and multi copied using the rotate tool and the center point of the hemisphere from the top view.

 

 

The Boolean Split with 2 way option is what creates the scallop and dome surface combination.  It also creates extra pieces as well that need to be selected and deleted to get my result.

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