Foundations of Light and Shadow - Part 17 - Subsurface Scattering
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- เผยแพร่เมื่อ 4 พ.ย. 2013
- This is part seventeen in my series on understanding how to render light and shadow.
Tools:
Adobe Photoshop CS6
Camtasia Studio
Wacom Cintiq 22HD
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The forum at sycra.net/forum/ is a growing community of artists all working to improve and help each other, it's free to join, so if you want to receive comments or critiques on your work, or maybe offer some advice, head on over!
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For full length feature tutorials on how to paint, how to draw, and more, visit PencilKings at www.pencilkings.com/dap/a/?a=914
....still somewhat patiently waiting for part 18....
Tricia Stark still XDDD
xd
same! I come back every time I study light and part 18 still doesn't exist hahah
This video series is the best drawing tutorial series I have seen on TH-cam so far! Really good job Sycra!
Totally agree!
So sad, this is the end of the road for the best tutorial series about Light and Shadow. Thank you for eeeeverything ive learned so far :D
Great series on light and shadow but I think part 18 is really the most important video that ties it all up.
I loved this series and you were able to demonstrate fundamental concepts that most art courses don't teach or don't teach well. Please be encouraged by us to continue this series if you have the time. 😊
Wonderful series and amazing work. You’ve helped me so much! More than any of my art teachers. Thank you. From the bottom of my heart, thank you 🙏🏾
Finally understand why you are always talking about light sources. It's improved me by a lot. Wish I understood earlier...
Thank you for all your great tutorials. I would love to see an additional shadow tutorial on how shadows fall on uneven surfaces.
i wont give up waiting part 18 Sycra :P
Yep still waiting
@@losiloso8178 are you still waiting?
@@ripterer *Legend says his soul is still waiting after all these years*
Well, you got the gist of it with the scattering. Essentially, the scattering you speak of hinges on a resonance principle. Suppose a certain wave of an arbitrary wavelength hits a random particle. If that particle is *small enough*, the wave's (oscillating) electric field can excite the charges within that particle, causing them to move around at the same frequency. This "synchronizes" that particle, "tricking" it into behaving like a small antenna - or in this case, a very weak point light of the same colour. This is basically a form of resonance.
Now, when I mentioned *small enough*, I actually meant about *one tenth of the wavelength*. Without delving into too much maths here, there is a formula that yields the _fraction of light scattered_, and that formula has somewhere in it a factor of _the inverse fourth power of the wavelength_. What this means is that *shorter wavelengths* (blue, violet) are scattered *more strongly* than longer wavelengths (orange, red).
This explains why "red light" travels farther: all the blue light is busy getting scattered along the way into random directions.
It also explains why the sky looks blue and the sun looks yellowish: the sunlight is both being absorbed by the atmosphere _and_ being scattered all around. Since blue light scatters more strongly, the sky looks like a mix of blue and green because of all the particles bouncing short wavelengths all about. However, when we look towards the sun, this changes into orange or yellow tones, because direct sunlight (plus some air density shenanigans) actually boosts this scattering effect (like the sunset would do), resulting in virtually no blue light reaching the observer. In reality, when seen from space, the sky is black and the sun is white.
You might want to check out a similar effect called *opalescence*.
Also, where's that part 18?
That's the sort of explanation I like.
dude its almost 3 years where is part 18 lol XD
it's been 5 years now
@@holanatymuffins yup
10years now 😭😭
I love you Sycra, this is by far the most complete foundations series on youtube and your explanations are so clear
Sir, I don't know if you will see this comment, but I hope you do. I just want to thank you for making this light and shadow series. It has improved my art skill and knowledge by a vast amount. For that I would like to thank you. Your "how I draw poses" video was also very helpful.
I always link my friends to this series, thank you so much for all this free information.
What an amazing series this was. I took notes all the way.
thanks a lot for the course, i just enrolled in a drawing course and the and fundamentals of the first classes are light and shadow, your videos have opened my eyes!
just finished the whole series and now patiently waiting for the next part xD
I'm an oil painter and this series and s the most informative on you tube thanks
WAITING FOR PART 18! #STILLHERE
Just watched the entire series. Simply taught, and beautifully explained. You are an amazing teacher. This helped more than I can tell you
Great channel man, ive been watching a little bit everyday for weeks and Its really helping. Very thorough.
Really glad you're still continuing this series... This has been really helpful!
rip part 18 forever in our hearts never in our eyes
Thank you Sycra. As others have already said, this series is so helpful!
Extremly usefull series! I learned from this more than all the rest of YT videos about drawing/painting combined and there were more than 200 of them!
Thanks a lot Sycra! Please keep sorting things in my head! :D
im not gonna give up on waiting for part 18 Sycra!!!! im getting into design college because of you!
Thank you so much for these lessons man! They really help out in thinking about all those aspects that make an image more detailed.
Part 18 please! You`re doing a great work and you have our gratitude!
Thanks a lot for making these light and shadows videos... Thanks to you I understand much better lighting!! I wish I had found your videos sooner because now I can see a lot of lighting mistakes in my past works... Thanks a lot for sharing your knowledge Sycra!! You're the best!!^^
Thanks for this, It's really appreciated. Subsurface scattering is really tough to understand sometimes. The colour painting made it clearer than just the line drawings.
insane tutorials keep up! i appreciatte them so much dude, you're awesome!
You're awesome Sycra!
I'm not exactly sure how to create cast shadows for more complex forms such as cylinders. Would love to see a video explaining :) learning so much from these, it is refreshing to understand the science behind light instead of just guessing around.
It depends on the color of the material being lit, the type of material, and the color temperature of the light. On skin, if it's lit with a single white light source, the shadows are going to be the warmest(and the core shadow is going to be the most "visibly"saturated if subsurface scattering is occurring), and as you get closer to the light source it's going to move away from red(on a light complexion, it moves towards yellow), become less saturated, and obviously become brighter .
Please finish the series. 8971 views means atleast 4500 ppl are waiting for the coming series. :D Pretty Please with cherry on top. Do not stop making these videos until it is complete. Thank you and God Bless You
Thanks for uploading these videos! Super helpful and well explained!
Thanks Sycra. Your serie was very interesting !
Very very helpful, thank you Sycra!
thank a bunch for the series great job ..
awesome series
If you have any time please continue this series, it feels like I'm finally starting to understand how to portray light accurately. Thank you for all your vids!
This was extremely helpful to me. Thanks!
Thank you for this series ^^
u r da best sycra thanks
Thank you so much for series!! I have learnt so much :)
Hey, love your series and big fan of yours. When are you uploading pt 18 and any others?
Thank you for these.
please more light and shadow foundation videos :)
PLEASE PART 18 :( WE NEED THIS
Thank you for this, it was very helpfull :D It really helped me how to lighten objects
I love you Will you mean the world to me.
Thanks! Amazing!
Yes!
Thank you for the awesome videos Sycra, me and my friends really look up to you. I was wondering, will this series continue to finally conclude with skin or is this the final episode? Of course you should only do videos that you enjoy doing, we're just curious : P.
Once more thanks for everything, you're helping us out much more than you could possibly imagine. Keep up the amazing work.
awesome.
Best drawing series
Thank you o/
Thanks again for you educational info. :)
Great series Sycra! If you ever want to revisit this, it looks like there is a loyal community waiting for the 18th instalment :)
Thank you so much for these! really appreciate them as always! =)
Thank you
I've tried drawing joints (and humans) as well as I could, but eventually I just had to learn a cartoony style from someone else and improve slowly from there... Though not really in relation to this video, I just wanted to say these are extremely helpful. c:
I forgot to mention that atmosphere also has an effect on this.
subsurface scattering, one of my favorite english words!
When is the next part coming out? Best Light and Shadow lessons in the interwebz :)
Have you ever made a video about how to draw a head from any angle? If not, would you consider making it?
new subscriber here..
searching next part..
I can't wait until he get's to explaining color!
Red doesn't necessarily have less amplitude. That's just how powerful the light is.
Thank you so much for this illuminating (xD) series
PLEASE MAKE PART 18 SOON!!!!!!
If I tried to listen to anyone else explain this I'd fall asleep. Thanks
what actually happen there is the light go inside the object, get bounced off the object and lose a bit of energy in the process, that's why the light get warmer. the SUBsurface scattering happen all around the part of the object where the light hit but you only see the light get warmer near the core shadow because the effect of the reflection on the SURface is not as strong there.
where is the eigthteen part? This is a greatful job thanks
Where is the 18th part XP
Sycra,could you please make a video about line economy in realistic drawing style?
and what about if you have a cool light, like a blue light, on a translucent object?
will the shadows still be more warmer and more saturated?
I want to tell you so much...I love you.
Soo are we going to see lighting for skin pleaase? : D
I think choosing to not paint the candle made the process much harder to grasp, but thanks for the video.
For anyone having trouble with light, Google "itchy animation tutorials", sans the quotation marks.
I DEMAND PART 18
When will you make pt 18?
Still waiting for part 18 xD
Hey! What gives? Where is part 18?
where is the part 18?
Well it‘s already been 5 years.. I guess there won‘t be a part 18 :(
I'm confused because Sycra says that red travels farther than blue but in at least one of Feng Zhu's videos I believe he mentions that blue travels farther than red. I don't know which one to believe. Or it's just a misunderstanding.
New video :D
can you draw manga male body in easier way? btw what kind of program you should to record your video?
is this the last one?
More
oh my god is that why infra-red vision works the way it does? Because there's even less of a chance it'll be obstructed?
How are U undo-ing multiple times?
Still waiting for part 18
If you don't mind me asking, what software are you using? is that adobe?
He's stated it in the author comments;
"Tools:
Adobe Photoshop CS6"
Thanks so much
Where is part 18?
Interesting to see art from a semi-scientific way. :P
Press 8 repeatedly
It's been 4 years, please