Messages

16

[Max] I need help! / Re: What is the best way to light a scene with strong artifical lights, in corona?

« on: 2015-12-09, 11:58:51 »

Thanks a lot, Maru.

I see that you used the self illumination slot... I use the light material but "emit light" disabled". What is better?

I have some  max ies light from max ( rigged ) that the converter does not convert, I fear that I will have to replace all this light with Corona IES (I see that the max ies emit less light and noiser...)

@noah45 .. My renderings are always.. for yesterday ;) I know that you understand me ;)

gaby

17

[Max] I need help! / What is the best way to light a scene with strong artifical lights, in corona?

« on: 2015-12-07, 12:30:56 »

I was just wondering... (I don't know if it's the right part of the forum to post this)

I work very often with shops that have a very strong artificial lighting and a weak natural light from the exterior.

(I've attached some photo examples)

In vray, I've always light this kind of scene with rectangular lights and very few IES. The bigger the rectangular light were, less noise they would produce... but the results were very flat and very slow if working with lots of ies lights.

In corona, I've tried different approaches, but I still fell that I've not foud the best "balance" (time/noise). Lighting only with IES lights seems very slow and noisy (I've not tested the new release strongly, although),
 Using only rectangular lights gives a flat lighting, but using the single lights as light emitter (with corona light material) is an headache ... lots of noise and deadly slow...

What would be your approach? Am I doing something wrong?

thanks
Gaby

18

Gallery / Re: Michal Timko`s gallery

« on: 2015-11-25, 09:12:30 »

Lovely images.

I like alot the deciduos trees outside... are they modeled? What program did you use for generating the trees?

thanks
GA

19

Gallery / Re: Restaurant in Uk

« on: 2015-11-09, 10:28:06 »

Hi Filippo,

I perfectly understand what you are saying... most of my work is "controlled" by designers that sometimes have not a clear idea of what they want... but in their opinion is  the opposite ;)

hope to read you again here :)

Gabry

20

Gallery / Re: Restaurant in Uk

« on: 2015-11-08, 13:56:49 »

Hi Filippo :)

 I see that you are testing Corona now.. how are your feelings with it?

I like the image... but seems a bit dark and I think that there are some light/shadows problems...

The "trumpet" chandelier seems not to light the room.. are you using the material directly converted from vray?

The parquet material... seems a bit strange, it's wood or ceramic? I don't see any texture on it, only color...

(We met at AD6 in Venice, I was the girl sitting in front of you ;) )

Gab

21

General CG Discussion / Re: SOA, Samsung Gear VR, 3d stereoscopic spherical rendering and VRay

« on: 2015-10-07, 17:22:04 »

I also was in Venice this year... and you are absolutely right Juraj, Dave Bullok made a wonderful presentation and showed FANTASIC images... perhaps the best interiors of the whole SOA...
I've thought they were made with Corona before he said that ;)

I also think that the cube camera 6+1 (or the spherical one) could be a very nice option in Corona . I've also tried the Samsung gear, and that was a REALLY nice VR experience. Even moving the head fast the image was stable and absolutely convincing.

I want to do the same with Corona :)

22

[Max] Tutorials & Guides / Re: Glossy Falloff Curve Experiment

« on: 2015-05-03, 21:16:11 »

Interestin!! Also I was playing with those glossiness fallof...

Just a question...

Why do you convert che glossy value to grayscale? Where do you put that number?

23

[Max] I need help! / Re: Help in better understanding Corona Materials - Reflections map and Fallof...

« on: 2015-04-29, 15:47:23 »

this is after 32 passes -- lot of noise in the metal , the walls are almost clean instead...
The noise won't clean perfectly neither after 200 passes...

there is a light right under the brass shelf--- perhaps there is a caustic problem?

No round corner option...

24

[Max] I need help! / Re: Help in better understanding Corona Materials - Reflections map and Fallof...

« on: 2015-04-29, 13:19:27 »

Thank you so much for your reply, Maru :)

Probably I was confused about it using the Vray-converter, that put always the old vray glossiness map into the Corona color slot into an output map.
 Why does the vray converter act like this? It's a question of levels?


Second question...
I'm working with a scene with lots of reflection and a gold/platinum material with 0.4 gloss. The reflections are still noisy after about 100 passess... but the rest of the scene is noise free... Only the reflection pass is noisy, cause the material has a black diffuse slot.
What Should I have to increase to get rid of the noise? (I'm using progressive + UHD, LSM 4 - Gi vs AA 16)  I've read that's more a question of AA, but I don't know well hot to increase it...

thanks again
Gabry

25

[Max] I need help! / Help in better understanding Corona Materials - Reflections map and Fallof...

« on: 2015-04-28, 19:04:46 »

Hello, I'm triyng to understand the correct behaviour of Corona Materials and I need some clarifications about the reflect/glossiness map.
I come from a vray "way of thinking"

In the helpdesk I read as "commons users errors" :
******************
Using texture maps in Fresnel IOR instead of Reflection Color slot
To vary the reflectivity of a material, you should place a texture map in its Reflection > Color slot. If you are using IOR textures, they need to directly output IOR values (1-999), not black-white (0-1). This can be achieved for example with output node or CoronaColor map.

Placing falloff map in material's Reflection Color slot instead of using Fresnel IOR
While using the falloff map may be a correct way of creating customized reflectivity curves, for simple materials it is recommended to use the Reflection > Fresnel IOR value as Corona internally uses more advanced Fresnel model which is required for its advanced shading models.
*****************

In vray I was used to put a B/W map in the reflect glossiness, and another map in the reflect color slot.

Sometimes I was using a fallof map in the reflect color slot... why it's not "reccomended" ?

If I wanted to use a custom fallof curve ( with custom IOR) , what slot should I use? In this case I should put ior to 999 to disable it, right?

If I want to use the Viscorbel method , with a fallof map to simulate the glossiness that goes from sharp to blurry... (here is the link http://viscorbel.com/vray-materials-part-2-reflection/) .. I should put the map into an output map?
If I understand well, the glossiness and the IOR work better with a full color map and not only B/W ?

forgive me probably it's a dumb question, but reading the helpdesk has confused me a bit, but perhaps I've understand why sometimes I was having too much noise in the render...

thanks in advance
Gaby

26

[Max] Corona Goodies - User Contributions / Re: ComplexFresnel Texmap

« on: 2015-04-28, 17:02:10 »

Any chanche to have it for max 2012?

I'd like to play with.... since I've read the Viscorbel article...


tnx
Gaby

27

[Max] I need help! / Re: night interior render - how to achieve less noise and faster times?

« on: 2015-04-16, 20:22:53 »

Thank you all guys, you saved my life ( oh, almost ;) )

I applied The changes you suggested, and the render times changed suddently...

In less than four hours I've had perfectly noise free images.. With crisp details..

I've not had The time to understand what was The problem, but when The project will be closed I will analyze The files to find what was causing The problem.

Things that I changed
No noise map in The reflection slot in The floor ( bitmap image, instead)
No deselect shadows in background image
Change IEs SHAPE from sphere to rectangle

My opinion is that The IEs SHAPE was The problem, but I have to verify that..

It could be a bug?

Thanks again!
Gaby

28

[Max] I need help! / Re: night interior render - how to achieve less noise and faster times?

« on: 2015-04-15, 17:09:47 »

Yes, you are right, there is lot of noise everywere.


What do you mean with "disable reflectivity"? put reflection to 0.0?

Now I've started another render (strict deadline, argh).. 30 pass, 50 minutes... lots of noise. humm...

29

[Max] I need help! / Re: night interior render - how to achieve less noise and faster times?

« on: 2015-04-15, 16:36:46 »

The image was 150 passes :/

I've disabled the IES, and modified the background image...
I'm doing another view, and now the rays are 1270000 :/ what's happening?

The indirect pass was almost clear, and also the reflection pass was not that bad...

I'm starting to think that the noise in the reflection in the floor could cause some problem, but I don't know why...

30

[Max] I need help! / Re: night interior render - how to achieve less noise and faster times?

« on: 2015-04-15, 15:41:43 »

There are the specifications... i've read that a corona light material with no direct emission could be used as Background

thanks A LOT for your help

gab