CGTalk Tips for drawing circles and cylinders with perspective
 04-07-2006, 04:14 PM #1 sekopasa PRO   portfolio Serkan Buldan Dreamer İzmir, Turkey   Join Date: Mar 2005 Posts: 154 Tips for drawing circles and cylinders with perspective I drawed some gifs for this tutorial i think they explain their self, if you have questions you are welcome. share quote
 04-07-2006, 05:08 PM #2 dredsign Veteran   Join Date: Aug 2004 Posts: 52 really useful!! thanks for this tutorial... i mostly draw these circles and ellipses by just trying and see if they look right... doesnt always work though... hehe share quote
 04-07-2006, 07:00 PM #3 arisuonpaa Frequenter   portfolio Ari Suonpää Akaa, Finland   Join Date: Mar 2005 Posts: 136 And when drawing with a template, note that the minor axis always points to the vanishing point. This was something really hard for me to understand and still is. Can anyone explain why it does that? It kind of makes the ellipse to tilt a bit.. -Ari __________________ http://arisuonpaa.com share quote
 04-08-2006, 07:02 AM #4 sekopasa PRO   portfolio Serkan Buldan Dreamer İzmir, Turkey   Join Date: Mar 2005 Posts: 154 I would try to find a reply to your question but couldnt exactly understand what you mean can you show us some drawing. Last edited by sekopasa : 04-08-2006 at 07:06 AM. share quote
 04-08-2006, 09:43 AM #5 Taltos Veteran   portfolio Christoph Buchner Physicist Vienna, Austria   Join Date: Jan 2006 Posts: 81 what i think he means is, that the minor axis of the ellipse is parallel to the "axis" of the circle (think car: a wheel and its axis, mathematically correct: the line going through the center of the circle, perpendicular to it). in your example, this axis points to the vp. A very useful/understandable tutorial can be found here. A very detailed text treating perspective here. __________________ Deviantart: http://buchi.deviantart.com/ share quote
 04-09-2006, 07:38 AM #6 arisuonpaa Frequenter   portfolio Ari Suonpää Akaa, Finland   Join Date: Mar 2005 Posts: 136 Thanks sekopasa and Taltos. I realized that every time the circle in perspective seemed to be tilted, I had the degree wrong. I think I could even use ellipses to make perfect squares in perspective, am I right? I have to look into that handprint tutorial. Hope I have enough idle time at work to go through it . -Ari __________________ http://arisuonpaa.com share quote
 04-10-2006, 06:18 AM #7 sekopasa PRO   portfolio Serkan Buldan Dreamer İzmir, Turkey   Join Date: Mar 2005 Posts: 154 To use elipses to draw squares is a realy good idea. But there is elipses in different proportions, the height can be same but it varries in width, will it be possible. share quote
 04-10-2006, 02:24 PM #8 keight Know-it-All   portfolio Katherine Wadey Graphic Design/Illustration Katherine V. C. Wadey Graphics Lakewood, USA   Join Date: Mar 2003 Posts: 471 Thank you for sharing this one too. This makes sense now. share quote
 02-15-2007, 09:01 AM #9 Sethelic New Member Seth -, Andorra   Join Date: Jan 2007 Posts: 16 Some further questions about ellipses 1. About using Ellipse guides: Doesn't ellipse guides just tell you how much 'exposure'(major axis fixed, minor axis shortens according to tilt) there is? it would be fine for axonometric ellipses, but doesn't perspective circles also foreshorten so how do you use an ellipse guide with Perspective drawing? 2. Does the minor axis of an ellipse in Perspective always align to the VP / thrust axis too? 3. anyone konws of any digital ellipse guide or equivalent? 4. the scott robertson tutorials on drawthrough.com seems to have been taken down, anyone knows where i can find it? 5 If i simply create a perfect circle in a perfect square then use 'free transform tool' in photoshop to Bring the 2 backends of the square together while keeping them aligned to lines extended frm VP, is that an accurate ellipse? 'compressing the two ends of the bounding box to create illusion of Perspective. I was wondering in this case( attached picture, not drawn to scale(esp edge length receding towards vp) : (i read that this digital method of 'squeezing' isn't very accurte?) Attached below: share quote
 02-15-2007, 09:01 AM #10 CGTalk Moderation Lord of the posts   Join Date: Sep 2003 Posts: 1,066,481 Thread automatically closed This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum. __________________ CGTalk Policy/Legalities Note that as CGTalk Members, you agree to the terms and conditions of using this website. share quote