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Postby iamthe202 » Sat Nov 04, 2017 3:35 am

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Subject title: Can vertical parallel lines decline over distance?

Hello, I wanted to know if parallel vertical rays or objects could bend/decline to the sides like a triangle as it's currently explained to happen.

Could you watch this and tell me if this video is right about crepuscular rays?


I need an artists point of view. Thank you very much.


Postby Audiazif » Sat Nov 04, 2017 11:22 pm

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The video is complete nonsense. Perspective is the explanation of why the rays look like they do. Perspective is not what proves nor should it be relied upon to prove the positioning on the sun. Perspective is an imperfect system. This point should negate anything in the video about perspective, not to mention the fact that everything in the video about perspective was either oversimplified, incorrectly used, or wrong.
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Postby Ambiguity » Sun Nov 05, 2017 1:55 am

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Someone in the comments easily debunked his theory with this photo:
Spoiler: show

It's the same type of rays, but seen from the clouds. Notice how they converge the other way now?

I believe the reason why his "far away sun experiment" didn't cause the rays to diverge is because it completely fits within a small part of the camera's cone of vision without the need to be very far away. The same thing will happen if you look down or up at a miniature of a skyscraper vs. an actual skyscraper.


Postby DarkLored123 » Sun Nov 05, 2017 1:59 am

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That video is utter nonsense, the person clearly has no basic knowledge of how perspective works and is going just by common knowledge. For the Y axis to converge the way he showed it would in the buildings of the city would only be possible if you look directly up at a 90 degree angle at the Y axis which would only result in the need for a single vanishing point.

https://www.google.com/search?hl=en&aut ... kBtg3ps6oM:

This is a great example image of what I mean, the effect he explained would only occur under these circumstances. You also can't explain how the rays of the sun behave without taking into account the influence of the Earth's atmosphere, the fact that clouds reflect light, and trigonometry.

https://i.pinimg.com/originals/66/b3/ca ... 03fa12.jpg

Look at this diagram, it also explains how the sun influences the Earth. Keep in mind that not all the light from the sun is absorbed by the atmosphere, and also the fact that clouds project light back into space due to its reflective nature.

https://www.intechopen.com/source/html/ ... mage2.jpeg

I wouldn't recommend getting artistic knowledge from such shady sources, at least not from sources that claim that the Earth is flat. The perspective system is as strong as its user, if you don't know how to manipulate it then you will simply not be able to fully understand its capabilities.


Postby Bugpal Hopeday » Mon Nov 13, 2017 10:15 pm

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This is only tangentially related to what OP is talking about. But check out this really interesting article on linear perspective and alternative systems like spherical perspective in which lines will appear to bend. I've used the template provided to make some environments, it's pretty cool.
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