Corbel

[Paraglobal]

Dear all

My second v-ray image

Any comments and and criticism are welcome.

I need some help to maybe add some bump to the material so that it's not so smooth, any ideas or bump maps for this?

Obrigado
Sergio


Below are my settings, i used 3 rec lights.
I go also with trial and error, most of the params in v-ray i don't know.



Hi Micha and magnatizerr

Micha my material is white 245,245,245
what is "vignetting"?? can you use some other expresion?? my English is rusty, ehehe.

magnatizerr I don't have any gloss i think, my material is normall white (no reflexions or refractions)
Can you send me a nice image that i can use as bump map?

I made some new tests

1-First image is the same configs but I changed the ground color, this way seems to give more enfasis to the Corbel.



2- Second image I tested with HDRI in environment and background



3- This is the same image as the previous but just with a wood texture on the ground.




Hi Micha

Thanks for the reply, I have made what you sugested and I have the feeling something is wrong...

first image 0.1
second image 0.5
Why is the Corbel so black??



Highlight glossiness: 0,1
reflection glossiness; 0,1



Highlight glossiness: 0,5
reflection glossiness; 0,5

[Micha_cg]

Corbel

Hi,

looks fine. Like a black&white photo. Maybe a little bit more contrast could be good. What are the grey values of the two materials?

A little bit vignetting effect per postwork could increase the photo look.

-Micha

[magnatizerr]

Corbel

Hi Sergio - Nice modeling.
If it's a plaster cast, what about using slightly less 'gloss' in the material properties as most plaster work is generally 'dead' to reflections.
However if it's a plastic component, I would use a subtle 'spark' finish bump map to the surface as this would be added to hide any surface imperfections in production?
Also, how about using a more exaggerated perspective to give the image more drama?
Just some thoughts
magnatizerr

[Micha_cg]

Corbel

... very important: never use a white material above value 200. In the real world 80% reflectance are the maximum. If you use more, to much light will be reflected. I have ask, because I had the feeling, that you have used a to high value - the details are looking a little bit dull.

Vignetting effect? Use the free photoshop plugin PTLens. Here you can set a vignetting effect -> the edges of the image are darker as the center. A good value is -8 ... -16.

http://epaperpress.com/ptlens/

I like the new images with the dark grey ground. The wood ground is nothing for me. But if you like to use it, try a little bit DOF. The wood ground could help to show the DOF effect.

The material dosn't look rough. I think, the problem is the render calculation model for non reflective layers. From renderman I know, that a special physic model for rough surfaces is needed - the flat disk look of the moon is an example for that effect. If I don't forget it, I will open a thread about this subject in the future.
For now, please make a test. Create a material with a reflective layer only and use a very low glossiness (0.5 ... 0.1). I never have tested it, but maybe it help. Set the reflection color at (190,190,190) or less.

[flipside]

Corbel

The material is so dark because you let it reflect 100%. White reflection color means 100% reflective. Since your enviro is probably black, your reflections will look black too.

I wouldn't use reflection on this model, bump should show trough without reflections also. Use whatever 'noisy' bump map you can find, or scan something in, or whatever.

[Micha_cg]

Corbel

I have done some "rough surfaces" research and the result can be find here:
http://www.asgvis.com/phpBB2/viewtopic.php?t=697

Please post answers about the subject in the new thread.