Not quite finished stuff... ;)

[pionier]

hello,

I'm also testing Corona renderer, at first I will try to make a glass, this is how it's look like for now:





later I will try to add beer inside and maybe few drops on glass.

btw, nice to meet you :)

thanks,
peter

[Ludvik Koutny]

Back side of the glass top looks oddly blurred, if you tried to retouch noise, i suggest to use noise reduction in Photoshop rather than smudge and blur tools :)

[white]

"beer" sounds damn goood!!! :)....cheers

[pionier]

Back side of the glass top looks oddly blurred, if you tried to retouch noise, i suggest to use noise reduction in Photoshop rather than smudge and blur tools :)

yes I know, DOF should be a bit smaller, I didn't use any smudge/blur tools as well as any 'retouch' trick so far, but thanks for your post :)

@white, thanks :)

[pionier]

hello again,

I have a question, after reading the forum I'm a bit confused - in this scene when I had just glass, I used onsided (solid) mode and it's look ok for me, but what If I want add beer, should it be onsided or twosided mode?

at the moment I have the best result with glass on onesided and beer twosided mode, question is this a correct way of doing this?

[Ludvik Koutny]

hello again,

I have a question, after reading the forum I'm a bit confused - in this scene when I had just glass, I used onsided (solid) mode and it's look ok for me, but what If I want add beer, should it be onsided or twosided mode?

at the moment I have the best result with glass on onesided and beer twosided mode, question is this a correct way of doing this?

Onesided... twosided means no refraction, like very thin glass, for example glass in windows or light bulb glass.

For beer, use same approach as you would in other renderer. Make a mesh of duplicating the  the inner side of the glass that will be a beer liquid, cap the top, invert normals and make it slightly larger so it intersects with the inner side of the glass a little bit :)

[pionier]

hello again,

I have a question, after reading the forum I'm a bit confused - in this scene when I had just glass, I used onsided (solid) mode and it's look ok for me, but what If I want add beer, should it be onsided or twosided mode?

at the moment I have the best result with glass on onesided and beer twosided mode, question is this a correct way of doing this?

Onesided... twosided means no refraction, like very thin glass, for example glass in windows or light bulb glass.

For beer, use same approach as you would in other renderer. Make a mesh of duplicating the  the inner side of the glass that will be a beer liquid, cap the top, invert normals and make it slightly larger so it intersects with the inner side of the glass a little bit :)

do i get it right?

[Ludvik Koutny]

hello again,

I have a question, after reading the forum I'm a bit confused - in this scene when I had just glass, I used onsided (solid) mode and it's look ok for me, but what If I want add beer, should it be onsided or twosided mode?

at the moment I have the best result with glass on onesided and beer twosided mode, question is this a correct way of doing this?

Onesided... twosided means no refraction, like very thin glass, for example glass in windows or light bulb glass.

For beer, use same approach as you would in other renderer. Make a mesh of duplicating the  the inner side of the glass that will be a beer liquid, cap the top, invert normals and make it slightly larger so it intersects with the inner side of the glass a little bit :)

do i get it right?

Yes, correct :)

[pionier]

thanks Rawalanche, interesting approach with this intersects :)

it's getting better I think :P

[maru]

I always thought it should look like this:

[pionier]

me too ;)

your second image is interesting, I will have to try to do it with different ior value on each side of glass & beer.

[Ondra]

actually, the best way in corona would be to detach some glass faces and make the liquid from them, i.e. to have only single surface between the glass and water. But I have not tested if it works correctly

[maru]

actually, the best way in corona would be to detach some glass faces and make the liquid from them, i.e. to have only single surface between the glass and water. But I have not tested if it works correctly

Yes, this is the method I posted. You create 2 separate objects that share one loop of edges (red spots). I think this is the most physically correct way. Creating a liquid volume which is a tiny bit smaller that the inside of glass gives very unnatural look. There are lots of tutorials on this. And best way to study this is by observing real life glasses. :) How about a non-corona tutorials section?

[Chakib]

Method showed by MAru is the best way for liquid inside glass, can't wait to see the final result

[pionier]

hello,

I did a test of something smaller:


btw, I find some nice topic about glass on maxwell render forum: http://www.maxwellrender.com/forum/viewtopic.php?f=15&t=17147

[pionier]

right, I think that making glass with liquid inside without having sss shader is a bit to hard, at least for me :P
here is the last test from it and I move on to something different :)



thanks,
peter

[Ludvik Koutny]

right, I think that making glass with liquid inside without having sss shader is a bit to hard, at least for me :P
here is the last test from it and I move on to something different :)



thanks,
peter

Refraction falloff + low refraction glossiness ;)

[Samurai Pizza Cat]

How come the glass is colored green in some areas ? I have the same issue with colored glass material.

[pionier]

Refraction falloff + low refraction glossiness ;)

I try this way:


kind of like this one :P

[pionier]

How come the glass is colored green in some areas ? I have the same issue with colored glass material.

that's what happened when you are not sure what to do ;)

[Samurai Pizza Cat]

The new one looks good so far, few ice cubes and it looks delicious ! :)
 
Any suggestion on how to solve the colored glass issue ?

[Ondra]

Do you have exit color set to black? if so, what other components do you have on the orange-tinted material? If there is some reflection, make it orange too

[pionier]

The new one looks good so far, few ice cubes and it looks delicious ! :)
 
Any suggestion on how to solve the colored glass issue ?

thanks!

as for the question, I think that happened when you pick up wrong color for refraction?

btw, have a question as well: is corona more like maxwell renderer (I mean physically accurate) or like vray?

[pionier]

Do you have exit color set to black? if so, what other components do you have on the orange-tinted material? If there is some reflection, make it orange too

so when you are try to make colored liquid you should tint refraction, reflection and absorbtion colors?
and what if you want get juice, should I also use translucency?

[Samurai Pizza Cat]

http://2.imimg.com/data2/QP/TU/MY-/gh-250x250.jpg

I´m trying to get this type of material, but changing the refaction color always results in a blueish tone (when using orange as color). Using orange as reflection color results in orange reflections as suspected.

Maybe a bug...

[Ondra]

btw, have a question as well: is corona more like maxwell renderer (I mean physically accurate) or like vray?

Corona tries to get the best of both worlds. In terms of accuracy, it is definitely closer to the maxwell quality (see http://forum.corona-renderer.com/index.php/topic,255.0.html ;))

so when you are try to make colored liquid you should tint refraction, reflection and absorbtion colors?
and what if you want get juice, should I also use translucency?

Do whatever looks good ;). Since there is no participating media/SSS, you will be faking the material anyways ;)

[Ondra]

http://2.imimg.com/data2/QP/TU/MY-/gh-250x250.jpg

I´m trying to get this type of material, but changing the refaction color always results in a blueish tone (when using orange as color). Using orange as reflection color results in orange reflections as suspected.

Maybe a bug...

This is an energy conservation issue. Refraction gets what remains after reflection. If your reflection is pure red, you cannot then have any red in refraction, hence you get the complementary color.

I can think of 3 ways to do this:
1) what is currently implemented (strongly colored 1 component results in complementary color in the other
2) darkening of all color channels equally (then you would get no complementary color, but gray/dark).
3) breaking energy conservation (fake)

I dont know what is best. Vray lets you choose IMHO between 1 and 2

[pionier]

http://2.imimg.com/data2/QP/TU/MY-/gh-250x250.jpg

I´m trying to get this type of material, but changing the refaction color always results in a blueish tone (when using orange as color). Using orange as reflection color results in orange reflections as suspected.

Maybe a bug...

did you try with absorbtion color and distance or/and darken your refraction color?

btw, have a question as well: is corona more like maxwell renderer (I mean physically accurate) or like vray?

Corona tries to get the best of both worlds. In terms of accuracy, it is definitely closer to the maxwell quality (see http://forum.corona-renderer.com/index.php/topic,255.0.html ;))

so when you are try to make colored liquid you should tint refraction, reflection and absorbtion colors?
and what if you want get juice, should I also use translucency?

Do whatever looks good ;). Since there is no participating media/SSS, you will be faking the material anyways ;)

thanks for your answer,
I'm asking because I'm wonder if you can do staff like this guy here, watch youtube movie from: http://www.digitalartform.com/archives/2009/04/parabolic_ellip.html
having possibility to make it as in real world is realllly cool!

do you like my latest render? would be nice to get nice result and give you nice render for your gallery so any c&c are more that welcome :)

[michaltimko]

Do u have diffuse set to 0, when using refraction ?

[maru]

This is an energy conservation issue. Refraction gets what remains after reflection. If your reflection is pure red, you cannot then have any red in refraction, hence you get the complementary color.

I can think of 3 ways to do this:
1) what is currently implemented (strongly colored 1 component results in complementary color in the other
2) darkening of all color channels equally (then you would get no complementary color, but gray/dark).
3) breaking energy conservation (fake)

I dont know what is best. Vray lets you choose IMHO between 1 and 2

Why doesn't this happen in real life?

[Ondra]

This is an energy conservation issue. Refraction gets what remains after reflection. If your reflection is pure red, you cannot then have any red in refraction, hence you get the complementary color.

I can think of 3 ways to do this:
1) what is currently implemented (strongly colored 1 component results in complementary color in the other
2) darkening of all color channels equally (then you would get no complementary color, but gray/dark).
3) breaking energy conservation (fake)

I dont know what is best. Vray lets you choose IMHO between 1 and 2

Why doesn't this happen in real life?

In real life you have 2 basic types of materials: metals and other. Metals have only 1 mode of interaction: reflection. If the surface of a metal is rough, the reflection is blurred, but it is still a mirror reflection from very small randomly oriented faces. This reflection is always done in a single color. So no metal combines 2 colors in any way.

Other materials have 2 types of interaction: reflection and refraction + subsequent scattering (SSS, volumetric effects) inside the material. Reflection and refraction of almost all materials is white-only (again, no color combination). Once light is refracted, it can interact with the material (SSS, volumetric effects). Different wavelengths are absorbed differently, that means that the light that comes out is colored. There is no diffuse interaction, it is just fake to simulate materials with very subtle SSS (light enters the material, bounces in it a little, and goes out).

tl;dr: no material in real life scatters and refracts with different colors. Also, real materials also have MUCH lower albedo than what CG artists are using (~0.3).

[Ondra]

do you like my latest render? would be nice to get nice result and give you nice render for your gallery so any c&c are more that welcome :)

Yes, it looks great!

[maru]

Ok, I think I get it. But what when (in real life) you have a glass object, covered in a semi-transparent coating. The glass is both reflective and refractive (coloured or not) and the coating is strongly coloured. So you end up with and object that is refractive, and has coloured reflection (filter). If the coating is RED, you only let inside light that is NOT RED. But you still don't see cyan coloured refractions inside, am I right?

[Ondra]

No, because those are in reality 2 separate materials. that interact differently. If the coating is metal, then you need it dilute its particles, because pure metal lets through no light. Then the illusion of transparency is created by mixing very small "everything goes through" and "nothing goes through" parts (think high-frequency noise in opacity map blurred by distance). If the coating is not metal, then the color is created by attenuating the light INSIDE the material. What comes out on one side is colored diffuse reflection, what comes on the other side is translucency and continues into the second material.

If you are interested in this, you can read more in
http://books.google.de/books/about/Digital_Modeling_of_Material_Appearance.html?id=FCJZO9DSeXAC&redir_esc=y
or in papers by Alex Wilkie:
http://cgg.mff.cuni.cz/~wilkie/Website/Home.html

[maru]

Thanks! I really appreciate these links! Wish my shitty school would teach me stuff like this.

[pionier]

Do you have exit color set to black?

yes I do :)

Do u have diffuse set to 0, when using refraction ?

yes I do :)

thanks for interesting chat here, I'm glad that few of you get inspired by me and make own glass renders!

[pionier]

hello,

it's me again,

just want to share with you few renders I did for models presentation for making of Disney Vacation for chaos group,
I didn't want spend lot of time on it but I think it does the job well, at least I like this 'studio' setup and I love DOF from corona ;)

thanks,
P.

[pionier]

back to testing corona, one more time glass topic ;P

[pionier]

fighting with caustic and render a bottle from my latest project, at the moment I try msi setup at 0 and bucket render ;)

[Ondra]

If you are not using blend material, this would be a great time to switch to VCM renderer...

[pionier]

If you are not using blend material, this would be a great time to switch to VCM renderer...

I rendered this in ful hd frame over the night and was happy with the quality, as for vcm.. I did try it but get some bad result, lot of splotches ect even after 1,5h on half hd frame, photons was setup fo 30k But I am not an expert, maybe I setup it wrong somehow?

[Ondra]

the photon radius needs to be tweaked based on scene... try decreasing it.

[pionier]

Right, do I still need to put right number at msi when using vcm? Leave it as 25 or setup this at 0?

[Ondra]

MSI is not working yet with VCM, so you dont need to change it, there is no effect

[pionier]

hey,

well after many hours of testing vcm I give up and get back to PT, this is a new update, fixed lighting/reflection and compositing. still need a bit of love :D

[pionier]

right, what do you think about this one? would you call it finished?

[P&M]

Massive set of great renders Pionier.