Hello, I was not sure where to post this, so I hope that here is ok. Please move it if needed.

I am trying to figure out how to tell how to draw thicknesses on the inside of a ring shape. I think I am fairly close, but I was wondering if anyone could tell me the thought process and/or technique for how to do this. I am including a (very rough) sketch of what I have in mind.

Thanks in advance!
hunneebee

[attachmentid=9178]

Sorry, let me try the attachment thing again.

[attachmentid=9179]

You've got a good start! I can see that this is a whole, cut into a surface with some thickness. I was a little distracted by the straight angular lines (I suppose a box of some sort?).

Maybe a little more uniformity in the dark arc at the bottom of the ring. that would make it feel like more of a flat surface.

Keep at it! these types of practice drawings are wonderful technique builders for other larger projects.

Well now, its going to depend on if you're drawing a circle or oval and which angle you're viewing it from as to how you draw it.

I'll presume that what is in your illustration here is the angle that you're viewing it and that's about right for what you'd see of the inside of the circle or oval, but it really would depend on where you're viewing it.

You really need a reference to be able to accurately draw how much of the inside of the ring that you would see, as well as highlights, shading, etc.

Google image search is helpfull, you have to try a lot of searches and set the image size to medium or larger for high resolution pictures
Holes
http://www.webpanda.com/white_pine_county/...nball-hole1.jpg
Ring
http://s7ondemand4.scene7.com/is/image/Sig...36;detail$
http://images.etsy.com/all_images/6/6bf/5a...0xN.8307399.jpg
http://www.todiamonds.com/ring_109new.jpg
http://www.freepatentsonline.com/7107789-0-large.jpg
http://www.wcburnsart.com/stereograms/gold..._stereogram.jpg


Hole
http://www.thewarfields.com/cnccookbook/im...op/P7083543.JPG
http://www.myonlinediary.com/wall-insulati...ll-exterier.JPG
http://www.jasongraphix.com/archive/images...ia_patch_01.jpg

port hole
http://melindawebster.com/pitchers/porthole.jpg
http://www.tomservations.com/Pictures/Hone...%20porthole.jpg

Machined holes
http://www.stangpro.com/html/projects/84gt...stfull-67cc.jpg
http://www.cartech.com/news/sturmruger.jpg

Hole in the wall
http://www.qmul.ac.uk/alumni/formerstaff/i...lesden_wall.jpg
Thick wall
http://www.made-in-china.com/image/2f0j00z...S-PIPE-TUBE.jpg
http://www.pondsolutions.com/images/self-w...-air-tubing.jpg
Thick wall hole
http://sugarmtnfarm.com/blog/uploaded_imag...allArchBack.jpg

Hope something in there is helpfull for you!

At the following site there is a video tutorial on how to draw wheels in perspective. In fact this is the same principle.

See: http://www.how-to-draw-and-paint.com/draw-wheels.html

Thank you, everyone! These were all great help. Cees, that wheel video was excellent. I knew it depended on which way you were viewing from, but I couldn't figure out if there were general rules for how much you'd be able to see, and how to figure out which parts. But if you offset the same shape along the perspective lines, then the part where they overlap would be the parts you are able to see, I think. Like this:

[attachmentid=9183]

Anyway, thanks again to you all, I really appreciate the help!

Hunneebee

It was my pleasure to help you. You are on your way. Now it is time to really draw it without your computer make the ovals.