basty Posted September 19, 2014 Posted September 19, 2014 How to draw the polygon in AutoCAD such as the picture? Thank you Quote
ReMark Posted September 19, 2014 Posted September 19, 2014 Perhaps it could be done by using projection? Quote
basty Posted September 19, 2014 Author Posted September 19, 2014 Perhaps it could be done by using projection? I am not be able, could you tell me how to do it? Quote
ReMark Posted September 19, 2014 Posted September 19, 2014 I should not have said projection; I should have said "perspective". Normally a 2 point perspective is a realistic way show objects in 3D. In this case the object is flat. Quote
basty Posted September 19, 2014 Author Posted September 19, 2014 I should not have said projection; I should have said "perspective". Normally a 2 point perspective is a realistic way show objects in 3D. In this case the object is flat. Yes, still not be able to do it. Quote
ReMark Posted September 19, 2014 Posted September 19, 2014 There are numerous tutorials about drawing in perspective on the Internet. Have you looked at any? The topic is also covered in almost every book about mechanical drawing/drafting. Brief explanation of perspective can be found here. http://www.perspective-book.com/drawing-painting/perspective-draw-tutorial-vanishing-points.html Quote
basty Posted September 19, 2014 Author Posted September 19, 2014 There are numerous tutorials about drawing in perspective on the Internet. Have you looked at any? The topic is also covered in almost every book about mechanical drawing/drafting. Brief explanation of perspective can be found here. http://www.perspective-book.com/drawing-painting/perspective-draw-tutorial-vanishing-points.html Yes, but it doesn't tell you how to create a polygon in perspective. Quote
ReMark Posted September 19, 2014 Posted September 19, 2014 (edited) No it doesn't. It was meant as an example of the basic principles for drawing a 2 point perspective. Quick example: It's all a matter of setting up your Vanishing Point and Measuring Points. Adjust one or both to achieve the desired affect. Given some thought about what happens to the shape of your object as you adjust these two parameters. A change of perspective: Now it's your turn. Experimentation can be fun. OK, one last try then I'm done. Is this closer to what you had in mind? See how the polygon has flattened out? Edited September 19, 2014 by ReMark Quote
steven-g Posted September 19, 2014 Posted September 19, 2014 set the variable perspective =1 and use orbit to get a view that looks correct Quote
ReMark Posted September 19, 2014 Posted September 19, 2014 That's what I would call the lazy drafter's approach. No offense, I thought the same thing. LoL I really think the OP wants to draw in perspective. Quote
basty Posted September 19, 2014 Author Posted September 19, 2014 No it doesn't. It was meant as an example of the basic principles for drawing a 2 point perspective. Quick example: [ATTACH=CONFIG]50994[/ATTACH] It's all a matter of setting up your Vanishing Point and Measuring Points. Adjust one or both to achieve the desired affect. Given some thought about what happens to the shape of your object as you adjust these two parameters. A change of perspective: [ATTACH=CONFIG]50995[/ATTACH] Now it's your turn. Experimentation can be fun. OK, one last try then I'm done. Is this closer to what you had in mind? [ATTACH=CONFIG]50996[/ATTACH] See how the polygon has flattened out? Thank you for your effort. However, I still do not understand. Would you please send me an understandable step by step with its construction line? Quote
steven-g Posted September 19, 2014 Posted September 19, 2014 That's what I would call the lazy drafter's approach. No offense, I thought the same thing. LoL I really think the OP wants to draw in perspective. I'm all for lazy And it was easier than trying to explain about shooting rays and trimming back to a viewing plane. Quote
JD Mather Posted September 19, 2014 Posted September 19, 2014 ...I'm all for lazy I would have started with 20 questions to drill down to, "Why are you even doing this - what is your design intent?" Quote
BIGAL Posted September 19, 2014 Posted September 19, 2014 Reminds me of Tech school drafting 45 years ago I am that old, no such things as a computer. Two subjects scored 100 & 99 guess that is why I ended up where I am. Quote
mikekmx Posted September 20, 2014 Posted September 20, 2014 Reminds me of Tech school drafting 45 years ago I am that old, no such things as a computer.Two subjects scored 100 & 99 guess that is why I ended up where I am. ....Geelong? Quote
Dana W Posted September 20, 2014 Posted September 20, 2014 ....Geelong?This made me laugh coffee out my nose. Musta been that ONE point you missed BIGAL Quote
SEANT Posted September 20, 2014 Posted September 20, 2014 (edited) This demos one of the typical ortho- to perspective transforms. The right demos another lazy method by using STSC_Projective2D Exchange app to handle the circle transforms. HexPerspective.dwg Edited September 23, 2014 by SEANT Numerous Quote
BIGAL Posted September 20, 2014 Posted September 20, 2014 I still have all the hand drawn unwind a dual taper funnel and angle sliced polygons unfolded etc yeah the -1 point was for my hand writing. Quote
basty Posted November 17, 2014 Author Posted November 17, 2014 I actually never being taught a projection like this in my college. The only projection being taught are isometric and dimetric. I am a mechanical engineering myself. I wonder where was this lesson is taught? In school or college? Would somebody teach me this projection? I still not be able to construct a polygon into this kind of projection. Would somebody tell me in detail to construct a polygon to this projection? I would like to be a draughtsman artist which able to create such as below illustration: Quote
tzframpton Posted November 17, 2014 Posted November 17, 2014 The car you posted was not created by a drafting program, but a hand-drawn illustrator program (my best guess anyways). AutoCAD would be the last program you'd want to use for an illustrated image such as the transparent car body image from above. Quote
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