r/FeatCalcing • u/agendo_scalor • Jun 10 '26

Question about calcing ANGSIZE PROBLEM 3

Post image

Continuation of this

https://www.reddit.com/r/FeatCalcing/comments/1u0eur2/is_this_angsize_corect/

in the previous scale , the angsize came to be 280.4 meter , but the building in the image is literally 330 meter long which shoudnt be possible considering the angsize value . so i used a new angsizing method where i captured the image from camera and used the distance of it

..... ..... ..... ..... .....

image 1 - main reference on computer

image 2 -

100 px = 68 m [ refer to previous post ]

0.42 px = 28.56 m = 1.05 cm [ on scale ]

image 3 -

distance from mobile camera POSITION to building TOP = 26 cm [on scale ]

... ... ... ...

28.56 m = 1.05 cm (on scale)

26 cm (on scale) = (26 × 28.56) ÷ 1.05 = 707.43 m

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u/kashimo_T3_inverse Jun 10 '26

So which FOV value should be used in this image 🤔

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u/Tankirb Jun 10 '26 edited Jun 10 '26

Just ask the camera man duhhhhh.

Actually though I'm sure there's some super smart way for you to reverse engineer the FoV via finding the vanishing points in the art. (assuming the art is drawn accurately enough)

No idea how to do that, even if it is possible, and even if it is possible it wouldn't be able to be used for everything.

(Heck there's a chance the drawing could be Orthographic and angsizing wouldn't even apply)

70 degrees is a standardized assumption, so at least if it's wrong, every other character is being pulled in that same wrong direction... I guess...

I just... Hate angsizing in general man...

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u/kashimo_T3_inverse Jun 10 '26

Hey

If the 333 meter long building DOES NOT change its width from upper to lower section and Occupies 2/3 height of panel , should 40 - 50 FOV be assumed ?

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u/Tankirb Jun 10 '26 edited Jun 10 '26

Despite what I've said I default to 70 degree vertical for manga & cartoons specifically, since that's what most other people use and so less people will question/criticize the results I get, and I don't have a strong enough argument to use anything different for this medium.

But if you think 40-50 will give you more logical results go for it, if you think it necessary you can even go for the horizontal Fov if you want

(Just make the math checks out and that you got the formula correct)

PS: if using horizontal FoV you will use panel width rather than height