Industrial Design Fundamentals: How to draw Ellipses in rectangles
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- Опубликовано: 30 сен 2024
- I wanted to rectify a mistake I made in my previous ellipses video, and it is also a good setup for an upcoming video where I want to talk about rounding for edges.
Previous Ellipses video can be found here:
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Strauss - Blue Danube
I just realized the reason the centre of the ellipse isnt the centre of a plane. Because when viewing a plane in perspective, the closer half will be larger than the further half. But ellipses have equal halves, meaning even when viewed in perspective both an ellipses halves are equal. Hence why they dont line up.
Omg man, you explain so well!!
Glad you think so! ^_^
Please remove your previous video of ellipse from RUclips channel because if have practiced a lot by watching that video and i didn't know about this one . And after so long I came to know about this. To avoid these kinds of mishappenings please delete that video 🙏
Teaching is definitely one of the best ways to learn, and this is one of the results, you learned from your mistake and now you'll never make it again, respect!
Thank you, yes indeed we always make mistakes, especially me so I def try to learn from them :)
Why is this way more correct? I see the difference between measuring the ellipse first and measuring the square first but why is this the one that is considered correct?
Because in the previous video I put the center of the ellipse into the center of the box which is not correct in perspective where we have foreshortening.
Omg thank you! Finally I think I get it - I was making this very mistakes myself finding the square face plane center but not the elipse minor axis center! Thank you for making the only clear video about this issue, I was wondering so much what I did wrong
Hey I made the same mistakes one of my watchers pointed it out so credit is not really mine :) But really glad I could help you with this!
I think the answer of 'Ellipse inscribed in an irregular quadrilateral' in MATHEMATICS may help?
Hi Rob
Thank you for the video
I'm sorry, but I'm not quite sure I grasped the solution.
Initially, you said that when drawing an ellipse in perspective, using a rectangle and its diagonals, the point where the diagonals intersect is not (as you previously thought in another video) the center of the ellipse-in-perspective.
You showed this by drawing minor and major axes first, creating an ellipse and then making a bounding rectangle around it. Again demonstrating that the intersection of the minor and major axes of the ellipse (i.e., actual center of ellipse-in-perspective) is NOT the same as the intersection of the two diagonals of the rectangle that fits the ellipse (i.e., center of rectangle-in-perspective)
So what is the solution? If you begin with a rectangle-in-perspective, how do you draw a more accurate ellipse since you can't use the intersection point of the diagonals?
Was the point just to show that it is wrong but a good approximation?
Hoping for a reply
Thanks!
Yes exactly your last point. I am actually teaching on the uni as well and we suggest that students take that point as an approximation. The section line of the face that halves it and entails the center point on that face because of perspective is going to gie us two halves that in perspective will be distorted. The half closer to the vanishing point will be narrower than the one further away. Because we are constructing the ellipse in absolute geometry and don't pay attention to foreshortening, we will probably have to place the center of the ellipse slightly to the opposite direction of the vanishing point that acts on the face that we are working on. But the approximation of hovering and finding the intersection points will work well enough as well.
@@robertlkiss Great! Got it. Thank you!
i think a great video would be for you to make the front axle of a car and show the two different ways of drawing the ellipse in the square and observing the differences.
U spake like vision
I don't know what to believe anymore..
Believe in love ;)
Thank you! :D I was actually struggling trying to learn the basics with your previous video on this as my about only insight on the subject.
Hey Rob, thanks for the video. I have one question in mind…if you draw squares in two point perspective f.i. for a horizontal grid, the ellipses in it shouldn’t rotate as the vertical lines of the square (or cube) would stay parallel. To make it clear, every ellipse in this kind of perspective grid shouldn’t rotate but stay parallel to the horizon line. A rotation of the ellipse in a horizontal 2 pp grid would only make sense if the verticals would have a indeed a vertical vp which then should actually be a 3 pp. Am I Right with this?
Woah imma be honest I'm not quite getting the question. If you joined me on a live session on a future thursday(after the 22th of Sept, I'm still on action till then) I'll gladly try and answer your question there.
that process works much better! Thanks for the correction and update!
Glad it cleared things up, sadly mistakes are made sometimes.
gran vídeo maestro👌👏👏 , tendrás algún tutorial de formas orgánicas ?? gracias
Thank you very much. Next one will be about how to round corners which is one step closer to organic :) Did you have anything specific in mind for organic forms?
@@robertlkiss muchas gracias estaré a la espera, algo como ZAHA HADID saludos
great and important video !!! ....
however, now I'm a bit confused ...
I thought that the axle of the car wheel is an extension of the minor axis ...
now,, after this video, is it still the minor axis ??
or should it start at the center of the bounding box of the wheel?
The axel of the car wheel is an extention of the minor axis nothing has changed there. The point here is that if you draw a square around the wheel, the center of the square will not align perfectly with the center point of the ellipse.
But if it is the case, than rotation axis of a cube ( face center point -> perpendicular vanushing point) would be different than rotation axis of a wheel (ellipse minor axis) which seems kind of wrong. Imo in order for this whole minor axis thing to work, center of a cube's face must coincide with minor axis of a ellipse which is not a case with some 1 point and 2 point perspective cubes. Am I missing something?
@@jakubstaniak9124 Scott Robertson says that the major axis misses the midpoint of the rectangle entirely. The "midpoint!" of the minor axis misses the midpoint of the rectangle also, but if you extend the minor axis from its midpoint a bit further it intersects the midpoint of the rectangle. In the end the midpoint of the ellipse is not the midpoint of the rectangle but the midpoint of the rectangle lies always on the minor axis "somwhere" (most often they are very close to each other).
:/ the center of the ellipse is not the same as the center of the plane BUT the center of the ellipse remains on the long axis of the box or cylinder you are drawing it into :l
If I said that I probably misspoke. The box doesn't have a long or a short axis since it's not constructed with the help of ellipses. The ellipse will be one of the ends of the cylinder so it is natural that the axis that forms the center line of the cylinder goes from one ellipse center point to the other. I hope this helps.
One thing i have trouble figuring out Is how a wheel has that beveled edge that gives the wheel that pushed out effect if You know what i mean and also rounded cubes i would like to know about that as well.
Rounded cubes was planned next but the beveled wheel is a good topic for a quick video as well. I shall do a quick one on that in the future as well.
Thank you, life is a learning journey, many thanks for sharing
Thanks for the kind comment happy to hear you enjoyed my video!
Thank you! But how did you find the center of ellipses at around 5:27?
As you can see at 4:24 I start out with the ellipse center, so I don't have to find it.
@@robertlkiss Ah I see, sorry about that I must have missed it. Thanks man! Your explanations are perfect.
I was like Yh that makes sense of Yh duh, then he just shouted WRONG and I was like oh snap
ꜱᴏ ᴀʟʟ ᴏꜰ ɪᴛ ᴡᴀꜱ ᴀ ʟɪᴇ!?
Not all of it, there is always a kernel if truth ;)
Thanks for your honesty
We all make mistakes, that's how we learn and grow. It's important to acknowledge them.
Awesome
Thank you
Oh yeah and then maybe You can teach us somethings about constructing complex volumes!