I'm gonna be writing an essay about how maths is used in computer graphics, and I've been spending quite a while trying to find an actually decent explanation of perspective projections, and here's my answer! Thanks so much, this video's really helped me.
i know Im asking the wrong place but does anybody know a trick to get back into an instagram account..? I was dumb lost my password. I love any tips you can give me!
@@elonkamden6848 Very off topic haha, there should be a link on the login page saying "Forgotten your password?", that might help :) P.S. The essay was over a year ago now but I did well in it, so thanks again so much for the video!
10:57 "Babies see the world upside down" that interpretation is debatable. The nurological wiring responsible for vision develops/grows tremendously during infancy. There is however no reason to correlate retinal cell placement with vision data (image snapshot) being conjured by occipital lobe. BTW very nice explaination of perspective projection.
Hi, I have a series of videos on perspective. Probably the easiest way to see them in order is via the resourses page I have set up for my students. I hope it helps. Good Day. www.gmitletterfrackresourcecentre.com/techncial-graphics.html
What if the picture plane is in the same plane as the espectador? What’s the math matrix to give us the length of each railway tracks in the final perspective?
Hi Bea, I'm unsure what you mean? The 3d representation on the right is only for explanation purposes. Normally to create a technical perspective you work from the 2d plan view (viewing the object from above) and use vanishing points to determine the heights in your perspective image (the top left picture). You can (but dont need to) use a side view. I have other videos in the series that focus more on the techniques of using the basic concepts of using the plan view and vanishing point to achieve the perspective image, they might help clarify your question.
Is there supposed to be a constant, or ideal, distance between the spectator and the viewing plane? I tried drawing a cube with this technique and it looks funny xD
yes but how can i find the projection of the distance between the stairs without a side view?you said it is not nessesary but how can we do it without it?
Hi John, That's cover in my second video on perspective. The easiest thing to do is go to my website www.gmitletterfrackresourcecentre.com/perspective-projection.html I have all my perspective videos in sequence there so it'll be easier follow them.
I tried tilting the picture plane so that the spectator is looking down (to the basic box i drew) but i can't figure out how will i introduce the 3rd vanishing point. 😕 Great explanation btw this helps me alot
Personally I'd add an end view out to the side where I'd see the tilted picture plane as an edge. Then draw your projection line from the spectator parallel to the edge on the object. Where this hits the picture plane will give you the distance below the horizon line. You should check out the book Perspective from basic to creative by Robert Gill. It's a real gem when it comes to technical perspective.
For set perspective questions it isn't really determined rather its given as part of the question. Sometimes the spectator height isnt given but instead the height of the horizon line is specified which is just a way to throw students off as they are always the same height. If you are creating your own perspective image (not a set question) you can pick your own height to suit which part of the object is most important to you, a spectator height taller than the object will allow you to see more of the top of the object whereas a spectator height around the middle of the object will focus on the front. Try and match your spectator height to where you would normally view the object from e.g if you are drawing a building then you'd expect the spectator height to be quite low to the building as normally you'd view the building from the ground, if you want a birds eye view then the spectator height would be higher than the building placing you above it. Hooe this helps.
Being honest I can't say it is one way or the other (neurology isn't really my area). I know that test have been conducted with adults where reversing lens have been used to see how an adult brain adjusts to flipping of images. The results have shown that they adjust within a relitivly short space of time. I'm going purely from looking at how the eye is arranged and some articles that I came across. e.g.www.mentalfloss.com/article/91177/how-our-eyes-see-everything-upside-down#:~:text=As%20it%20draws%20on%20our,the%20raw%20visual%20data%20yet. I just thought it was an interesting example of the geometry. I could stand to be corrected though.
