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Please read the rules! Last update: 04/27/2021

yea.jpg

Anonymous 26656[Reply]

how to determine contours in refraction
basically how cg does it but illustrated/in analog

i dont quite get it especially in practice of the example

i guess it's kinda obvious but i d like to see a hands on example or technically the more actual presentation
like maybe ten rays of lines forming a shape from the refracted object/environment to the refracting object like the glass object nearest to eye/camera

or maybe marbles to marbles overlapping

like, a very visual if not also aesthetic troubleshooting of realism or colors
or just how cg works in a more complete,shape by shape example
3 posts and 2 image replies omitted. Click reply to view.

Anonymous 26670

>>26658
don't have a good example unfortunately, but the tree you highlighted is actually on the right side in reality. The glass marble mirrors the image in both axis as well as adding a fisheye effect, that's why its not in the frame on the picture.

I guess I've learned this in physics class? Look into how lenses work, but there are various optical effects that are hard to model with lenses like caustics and that weird thing water does when you look up from below.

Anonymous 26677

>>26676
there is no easy way to map the contour on an irregular surface like a glass of water accurately. every ray of light you see takes an independent path between your retina and the object, and gets refracted on each material boundary based on the density of the lense material.

To accurately calculate the outline you would have to model every ray of light in it, and know rhe differences of density of the air, glass and water. A difficult task for a raytracing computer, a very difficult task for a human.

I think the best you can do is watch some youtube videos on the basics of lenses and try to make a believable guess when you are drawing, or use a similar object in real life to see how it would look. (if this is for drawing)

Anonymous 26704

>>26677 aw man. i lost this thread
well i have seen the lens theory and by assuming n1.sin@1 = n2.sin@2 , one can then assume than sin@2 is just n1/n2 * sin@1, thus the size of @2 is as big as @1 but with n1 defining the "forward" and n2 multiplying the "hypothenuse", since they are the same side of the ratio, i guess, so the bigger the n2, the longer the hypothenus, such and such

but this all is my assumption only, and honestly, while it is expensive for computer,
i am surprised it is not done manually first to affirm the guessing, unlike other things like reflections which are more general in drawing? very strange
expectantly i need a stronger assurance than that of a 3d software or photo, which also means youtube tutorials are only enough descriptive than completely

Anonymous 26808

savedfile_20240104…

bump more info i guess
just looking for some sort of… finality to this understanding
https://4-ch.net/img/res/4686.html#i4686

i guess it's about, "countouring" and that's no science

Anonymous 26809

Glass



waifu.png

AI Generated Images Anonymous 23336[Reply]

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Anonymous 26789

>>26788
>>26787
I thought these were a repost. How original, heh?

Anonymous 26801

_63cacbdb-68a3-475…


Anonymous 26802

_4d5b46b6-ea4b-472…


Anonymous 26803

>>23804
https://novelai.net/
Stable Diffusion locally

Anonymous 26805

_e9d7a3c1-a75f-48d…

i like the bing one.. my pc can run its own but i'm too stupid to set it up



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Cozy thread Anonymous 893[Reply]

:3
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Anonymous 21118

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Anonymous 26650

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Anonymous 26695

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Anonymous 26712

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Anonymous 26786

GCXEKoeWsAA24Nu.jp…




biobio.png

Anonymous 26519[Reply]

Bio chan/Terf/Radfem art or meme

Anonymous 26520

__bio_chan_origina…


Anonymous 26521

1664979740571.gif


Anonymous 26730

Hqhs3pR.jpg


Anonymous 26736

IMG_20230926_09473…




8pncoof.gif

Gloomy weather Anonymous 64[Reply]

Post cozy, gloomy weather.
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Anonymous 25841

8c3c620e75349fe6f2…


Anonymous 25846

eric-muhr-Fs-bcmsV…


Anonymous 26008

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Anonymous 26635

82440556_p0.jpg


Anonymous 26714

b4ecda21389e49a3d3…




x_gsc90503_e.jpg

anime figures Anonymous 9646[Reply]

post anime figures here! (it doesn't have to belong to you, pic related is a cool one i found on the internet)
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Anonymous 21426

9C06CBFB-7100-4635…


Anonymous 26649

3250221.jpeg


Anonymous 26651

>>9653
>>10034
>>10036
>>10265
>>10266
>>10268
>>10424
>moidshit lolis
Fucking disgusting

Anonymous 26679

3248987.jpeg


Anonymous 26708

1b55bd48ed9b35ce03…




erika-linder-crock…

Female Models Anonymous 9002[Reply]

Just cool-looking photoshoot photos of models.
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Anonymous 12890

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Anonymous 12892

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Anonymous 12893

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Anonymous 26615

image.png


Anonymous 26640

imagem_2023-12-08_…




9bd71020ce845bb52b…

Bingo card thread Anonymous 21511[Reply]

Post bingo cards or blanks and share your results

dumping cards
70 posts and 67 image replies omitted. Click reply to view.

Anonymous 25246

изображение_2023-0…

>>21511
it was fnun

Anonymous 25247

изображение_2023-0…

i still kin dirk….

Anonymous 25339

fuck the outdoors.…

>>25212
>Can’t get rejected if you never try.
Ah, I see you are a shut-in. I am something of a shut-in myself, you know.

Anonymous 25340

1526234855771.png

idk what constitutes "constant compliments"

also "goddess status" and "uses multiple guys credit cards" ?? a lot of the stacy ones seem so unrealistic as to only make others feel bad. this was defs made by a man

Anonymous 26602

eagdvbdasv.png

>>21521
Aint no way I got more stacy stuff than femcel



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Cool Vintage Photos Anonymous 26585[Reply]

Anonymous 26586

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Anonymous 26593

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Anonymous 26597

vintage_spaghetti_…




water.gif

Gif thread Anonymous 4541[Reply]

dump all your cute/beautiful gifs here!
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Anonymous 26523

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Anonymous 26524

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Anonymous 26574

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Anonymous 26575

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Anonymous 26591

1685781682142078.g…




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