Introduction to perspective projection

[@adampartridge1903]

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.

[@elonkamden6848]

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!

[@adampartridge1903]

@@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!

[@aniruddhashahapurkar9244]

Great help. I just loved the way you explained the concept. And the animation is also commendable.

[@beastman1083]

THIS EXPLANATION...IS GREAT!!! I was trying to define what a picture plane is...I knew it by using it but couldn't explain it in simple words.

[@briankisimba1969]

Thank you for this, the world needs more of you. Looking forward to your next videos.

[@CASH-TO-THE-MERE101]

🔥💪💪💪

[@alirezaakhavi9943]

really amazing video! thank you very much for the great amount of effort you put on this video! :)

[@DarkLordAli95]

what a great explanation, thank you so much Thomas.

[@vvyogi]

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.

[@BOURNE399]

Wow I can't believe my brain has cheated me for so long about the vision...Good Job Thomas!

[@yashinisuppayah777]

for some reason, your voice reminded me of Harry Potter :( !!! Nice voice man!

[@luvon1114]

best explaination I've heard on the subject.

[@wongmichael7620]

Excellent explanation. Thanks.

[@divakarannappa1885]

Very nice explanation tat reached my intuition nicely. Thank you very much.

[@ashishjain871]

This is a mind-blowing video; extremely well done. Wow :).

[@OwayneKhoo93]

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

[@theapexpredator157]

Would love if you could explain the theory behind how to create a cube in linear perspective (especially 1pt and 2pt).

[@thomassheppard5369]

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

[@anushangawimalasena1441]

Nice, Simple, and very clear explanation.

[@hiitsif]

very helpful. thank you

[@javierborda8684]

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?

[@alee9915]

Thank you for such informative explanation. Now i got the idea what exactly perspective projection is 🙌

[@AbiNomac]

Your channel looks awesome. Glad I found you

[@pratyushmathur3294]

Good explanation by u Keep it up......

[@user-rp9iis1en6h]

Excellent tutorial. Thank you so much for this tutorial.

[@rutujakaushike8759]

Nice explanation for such difficult concept!

[@devawratvidhate9093]

best explanation on vanishing point

[@gautamjain2487]

great explanation worthy of a like.

[@ayank6164]

Great explanation. Loved the video 😍

[@anomienormie8126]

That Irish accent. So nice to listen along.

[@wajdanali1354]

I had goosebumps after realizing the genius behind the last supper

[@wyattdeanwhiting4008]

oh shut the fuck up, there's nothing special about it

[@wajdanali1354]

@@wyattdeanwhiting4008 tell me more

[@jamesariescopioso8841]

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

[@thomassheppard5369]

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.

[@jamesariescopioso8841]

will check that out, thank you🙂

[@johnchatz]

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?

[@thomassheppard5369]

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.

[@ananduajayan8829]

Great explanation, thanks a lot

[@RapidBlindfolds]

once you draw the image on the 2d picture plane do you also draw the 3d actual scene as is behind it?

[@thomassheppard5369]

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.

[@areejabdu3125]

the explanation is awesome !

[@yashpandey9550]

Absolutely brilliant explanation.

[@abdallaelmedani8933]

Outstanding explanation. Many thanks.

[@siddharthkhandelwal933]

what an explanation !!

[@tycoonnilesh]

EXCELLENT WAY OF EXPLANATION!!! 👌

[@sayrai2132]

height of spectator, how is determined?

[@thomassheppard5369]

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.

[@sayrai2132]

@@thomassheppard5369 means a lot, THANK YOU!! Hoping u have a good day ☀️

[@ivanoleaanimator]

Dear Thomas, do you teach online?

[@nostalgic.sulata]

Extremely good....

[@srilekha3262]

Thank you

[@marconjo2004]

Really make me understand whats going on, thank you

[@sob5520]

Great animations!

[@bhaskarbravy8416]

excellent explanation . superb.

[@AstroboyHimanshu]

Thanks :-)

[@xiaoweidu4667]

fantastic

[@-thulasikrishna]

Supurb, cool guide Thanks a lot

[@sivaram4100]

thanks for the video

[@min-min687]

Thanks!

[@kaanmete105]

best! thank you very much :)

[@syzer3921]

Love it!

[@cashphattichaddi]

Loved it!!

[@Amritharaja]

good work !!

[@cvismenu]

Just wow

[@breakdancerQ]

Do babies really see the world upside doen temporarily? I don't remember that, but great video nonetheless! Lol

[@meganathana6464]

very good

[@pbalaji5723]

development of surfaces in telugu teaching

[@anjaliashokan4534]

👍

[@salamafaisal6543]

Specify the goal and need money

[@premkr6734]

thanks

[@kkk2323111]

Fantastic explanation!

[@adithyandamodar2663]

exam in 5hours

[@RaRapidum]

Exam in 9 hours :D

[@AhmedElsayed-ur1iy]

LMAO exam in 13 hours xDDDD

[@ThinkCleverAndSmart]

Exam in two days. However, I have to do the calculations for this. Not explain how it works. :P

[@RaRapidum]

Same here too, CS major is a pain in the AAAAAAAAAAASSSSSSS

[@kanupriyajamwal]

3 hours

[@karlvey2033]

Many thanks. Reply

[@gauravladha5465]

Make it audible bruh.. :l/

[@beastman1083]

...TRY SOME HEADPHONES....

[@noneofyourbuissness4338]

helped a lott

[@DaniIhzaFarrosi]

Hello there fellow examers

[@pbalaji5723]

simple way please

[@sridatta7001]

I dont think the last baby fact is true

[@thomassheppard5369]

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.

[@krgrief]

exam in 15 hours :(

[@prabhu1517]

exam in 18 hours

[@khemnayak2410]

Khem

[@khemnayak2410]

Hii

[@aidencaldas2681]

kyson

[@miksennalo8940]

Your words ain't clear.

[@SquidkidMega]

he's speaking english

[@nagasivakrishnauppuluri2967]

You'r voice is not audible