Hi!
Maybe this post will be useful: Steam engine modelled after a real-world kit - #27 by prisoner849
2 Likes
For the uninitiated: this little wheel is part of a bicycle rear wheel gear shift mechanism:
As such, it is a variant of a roller chain sprocket, albeit on a special small scale (pitch = 1/2").
If you want to eventually animate this, I’d like to advise to be very precise with the surfaces which come into contact with other (moving) parts, like for instance the chain. The “gaps” of this jockey wheel could be modeled more generously, imo. I used a self written little .js script for the contour, while making it 3D in Blender. Maybe you’ll want to view the opening post of the above linked thread.
2 Likes
You can create it from a 2D shape, an SVG or canvas drawing like, then extrude it with ExtrudeGeometry.
1 Like
Hey,
First of all…thank you very much for inspiration and ideas - very nice people Here in the Forum!
The examples you showed me - this goes definitly in the right direction allthough i have too add some more elements. Actually i am quite new in three.js and IT
seem to be easy to use but fore more.qualitity you have to have a lot of experiences.
Maybe i can geht one or two more hints …but i have to say what i want to do. I am Just doing this funny Figures from old table-soccer-balls (www.elockis.com). There i combine old bicycle stoff with the Balls and the result you can See here in the Picture. Mostly i combine the ball with a jolley and on the top i put some Material as hairs. So this ist the Basic Form and this i want to build with tree.js.
The example you send me ist yery close to thing i want to build (can i re-use the.code?) but i have no Idea how i can put a ball (spheregeometry?) directly on IT so i have the basic “elocki” -figur for using in a Game. (Eyes , nose and mouth will come later).
Oh, I see. 
I was hoping for another entry into our unofficial roller chain animation challenge. Apparently, you are not that interested in precision modeling but rather into the “fuzzy” stuff - no offense intended!
Still I recommend the “Model in Blender - export/import as glTF file - visualize in Three.js” workflow. Be aware, that both Blender and Three.js come with a learning curve, though.
2 Likes
Hey, after spending a lot of time in visual Studio and studying the examples i am now a little bit futher. I got a sphere for the.corpus and some Basic geometries for the parts but now i am in a stuck state. I really spent a lot of time with the examples tree on a ball but maybe i am to stupid for the aspect of the cordinates and x,y,z Handling. ( I have no Problems with color, Material or things Like that ONLY with positioning the Elements in the surface!).
As you can se in the pictures i added i want to add ears and eyes ON the surface of the sphere but it does not work. Maybe you can give me a hint or an idea or another example - i am really frustrated now.
The eyes and parts (as a cylinder or a sphere) shall:
- sit In the surface
- shell move and Turn with the Corpus
- ears shall be exactly in the other Side
- eyes shall be in the Front …Same height but a little bit away from each other
- nose in the middle of the eyes but a little bit more in the Center
- the base exactly under the Corpus
And -this ist really important- the whole figure should Turn around the Axis around the two ears (as an table-Soccer-Figure…shurely you know what i mean. (IT IS The blue Line in the Picture)
So …any help is perfect also for only a Part of my Problems. I know IT IS a way 
Thanks krungle
I’m not sure how this request adheres to the topic of the thread. Usually a new topic should start a new thread.
However, the illustration is beautiful and very clear. The ring at the bottom could be replaced by a smashed torus for a more 3D-ish effect. Otherwise all other components are correctly identified.
As for finding the exact position of the elements, this is relatively easy. Would you be willing to make the first attempt? For example, make a sphere and make both ears - even if they are not correctly positioned, it will be no problem to fix them. The ears could be one long cylinder crossing the whole head … or two short cylinders. Both ways are OK for now.
3 Likes
hey, i did something but i looks horrible…
i have no idea how to position the “cylinder” exactly in the middle (blue ones) and how to position the eyes in the front (yellow - big). !
here is my code…
body{ overflow: hidden; margin: 0; }
6 Likes
hello prisoner849, this is really perfect …i worked for hours and did not get it. But now the question - do i get the code too ? (or is it in the video?).
The link is added below the video. 
2 Likes
okay…thank you so much !
Well i am allmost there where i want to be. The only thing i am missing is a 360’ rotation (at the same place) after i hit a key. Is Rotation the right way ?
Hey, i Just want to say thank you for.your Help. I continued working and got the Rotation and the Change of color.
Krungle
5 Likes
This is good news. Would you show a snapshot of the final version of the head? I’d love to see how it looks like.
hey, i did not change to much…just the colors a little bit. I am just thinking about how to make a ball rolling in the direction of my figure. And then - via Space Key - shoot the ball (after a rotation - still having it) back into where it comes from. Quite difficult for me :-).
elocki in purple
Well i am still struggeling :-(.
I found a lot of examples but in a way i could not Bring IT together with my Idea.
In General i want to Copy the “goaly-war-game” (Bad wording at These Times😔) of the tablesoccer (Football) Community. Here only the two Goalkeeper are Shooting and defending their Goal. But i want to do IT with only ONE Goalkeeper (which ist my Figure).
As you can See in the Picture :
i have some things (thanks to prisoner849!) marked in green
I think i can do the things marked in blue / black
I am struggeling with some things (especially the.rolling ball (should come from downside - shoot by backspace from the User(still implemented) and the pole (fix not moving - only the Axis for my Figure to Go left and right) marked in red.
So…any help (Tips - hints - examples) is appreciated - actually i am at a frustrating Point🥴).
What difficulty with the pole? 
https://codepen.io/prisoner849/full/gbOeLag
2 Likes
