[Thomas An.]

What is also strange is how the blurryness remains the same for different settings, so obviously we need also a density setting

Yes, I am curous too. It seems to me that the scattering parameter (randomness of rays in the medium) should control the bluriness of the shadow. So for example with low scattering (0.2) and low absorption (0.2) we should see pretty much a transparent surface.

And this comes to my point ... SSS is in effect a way to turn any object into a form of dielectric... its like the gradient of reality (all intermediete conditions) between opeque and crown-glass. The "murkiness factor".

Then if you look at the 0.8 abs one, the 0.2 sc one is darker, then gets brighter, brightest with 0.6 sc, then starts getting darker again.....

hmm, they are so close, I can't tell just by looking... I will check it

[Thomas An.]

Then if you look at the 0.8 abs one, the 0.2 sc one is darker, then gets brighter, brightest with 0.6 sc, then starts getting darker again

ok, I tested the values in Paintshop measuring the space between 1x and 2x.
The top row (light) for ab=0.8 from left to right (excluding the opeque)

HSV=90,104,190
HSV=90,104,198
HSV=90,104,201
HSV=90,104,199
HSV=90,104,179

[Tyrone Marshall]

Nice contribution Thomas,

Thankyou!

Please let me know if you mind that I linked to your thread in the cinemaxwell tips and techniques sticky.

[Thomas An.]

Nice contribution Thomas,

Thankyou!

Please let me know if you mind that I linked to your thread in the cinemaxwell tips and techniques sticky.

Thank you Tyrone ! Feel free to link away

[iker]

Wow! incredible reference Thomas! Thanks once again!

[big K]

this is a great reference and helps a lot !

thank you !
thank you !
thank you !

[aptoverde]

Thank you all !


One thing that puzzles me about these results is that the scattering parameter serves to darken the object in much the same way as the absorption parameter. Both parameters seem to have the same effect.

But... if that is the case... why have two parameters ?
(unless the SSS implementation is not 100% complete, even in this 1.2.1 release ?)

Also, if the absorption is 1.0, then I would expect an opeque object.

to see some diference you have to iluminate the scene from the side...

[Hervé]

I think inside 3D procedurals are a must for SSS... like this

http://www.asahi-net.or.jp/~pq1a-ogs/block_e.html

http://www.asahi-net.or.jp/~pq1a-ogs/sss_e.html

[true]

thanks

[trybul]

Thomas,

would you care to share your scene file that you used to create this ref chart? (and what app did you use to create it.?)

thanks craig

[Thomas An.]

Thomas,

would you care to share your scene file that you used to create this ref chart? (and what app did you use to create it.?)

thanks craig

Craig,

The scene is made in Rhino3d and it is so simple that I can't imagine how the file will help you (if at all). It is a wedge shape multiplied many times and the thicknesses already given (so you already know the scale.

Also, the Rhino plugin has some annoying bugs that causes many of the scenes to loose materials... so right now I have the geometry but the materials are gone and you would have to reconstruct them from the chart.

Can you can read 3dm files ?

[andronikos916]

very nice test Thomas!

cy,
Andronikos

[trybul]

Thomas,

here is the thing, i have tried to use your ref pic, and tried to build one of my own, but i cannot duplicate your results. For the most part the settings look the same, except for the extreems... ( ie .oo1).

that is why i was woundering if you would share, so that i could try to work back wards....

No i do not think that i can import .3dm. can you export to a .3ds?

thanks
craig

[Thomas An.]

Thomas,

here is the thing, i have tried to use your ref pic, and tried to build one of my own, but i cannot duplicate your results. For the most part the settings look the same, except for the extreems... ( ie .oo1).

that is why i was woundering if you would share, so that i could try to work back wards....

No i do not think that i can import .3dm. can you export to a .3ds?

thanks
craig

Craig,

Did you use the exact same HSV values, thickness dimensions and emitter strength as shown in the chart ? These parameters are important and need to be the same if you want to replicate the result.

[trybul]

mmmm. thomas, you may be onto something. i did not use the same colour of block. I was trying to make a yellow one. Ad i am trying to replicate an "livstrong" bracelet......

i will look into it further.
thanks.
craig