Dots on Spheres

matthew_tung

Im trying to make write dots on the pirannah plant using wrap. Does anybody know how? I also have the same problem when trying to make mushrooms from mario. I can't make it with white dots on the sphere.

Matt_Shields

One option is to extrude the circles as surfaces and then do a split face.  Then color the faces.

Evan_Reese

Here's how I'd do it. https://cad.onshape.com/documents/6f0cb58cfd784d46dcfaf8ed/w/d88dfe80aeabdac020f88c84/e/913728b15d59747951cd2b95

I'm using some custom features that I wrote, but there might be ways to do similar things using native features. It'd just take a lot more work.

1. Use my 3D points to place points all over the sphere. I'm moving some of the points farther away from the main sphere, which will change the size of the dot later on. Note, I was running into some issues with 3D points failing when I already had the mouth cut in there. It's not as good as if Onshape made the same feature, but it works.
2. I use my Spheres feature to make them around each point. The intersection of two spheres is always a perfect circle, so that's where we're getting the dots from.
3. use the Split feature to make the dots, and color the faces differently.
4. Optionally delete the spheres to clean it up.
5. If you're doing a color 3D print or something, maybe you'd want to actually use the thicken command on each dot so they are an actual 3D shape, not just a break in the face.

martin_kopplow

I'd probably create something that swivels on the sphere center, such as an angled plane, then sketch my circle(s) there and project them onto the sphere. That allows to easily re-adjust the dots on the surface later, without the need to design dot objects first.