Quartzite

[choronr]

A simple fractal terrain with strata and outcrops including two fake stones - one at 25 scale; the other at 12; each with a power fractal for color. Over the base of the terrain includes dandelO's fake stones. The composition depicts milky Quartz outcrops;  which worldwide,  is the most plentiful mineral. Three mountain areas near my home contain such outcrops at their summit. These can be seen below:
   
•   http://www.gemland.com/sierra.htm
•   http://www.azhikinggallery.com/galleryintro.asp?galleryid=QuartzPeak_013109
•   http://www.sangres.com/arizona/blm/sierraestrella.htm
•   http://www.arizonahiking.org/quartztrail.htm

All vegetation models used here were created by Walli and are available at NWDA.

[dhavalmistry]

nice grass clumps!!

[FrankB]

great lighting, Bob, I love it!

[Henry Blewer]

Well done. I have only seen quartzite from a sample in geology class. You have done well shading it. It's not the easiest mineral to represent without subsurface scattering.

[Mahnmut]

Really great image,
although to me the rock looks somehow sedimentary.
I think that impression comes from the smaller fakestones which at some places look as if they where embedded in the rock, likein some conglomerate.
But geological questions aside, great realism!
Best Regards,
Jan

[inkydigit]

lovely lighting and details as ever Bob, excellent!

[Dune]

From your reference photos it would seem you'd have to lighten up your outcrops. They are very milky, sometimes with some dark voronoi veins. Why not use a water shader with high (10) volume density (whitish)...

[choronr]

From your reference photos it would seem you'd have to lighten up your outcrops. They are very milky, sometimes with some dark voronoi veins. Why not use a water shader with high (10) volume density (whitish)...

Thank you all for visiting.

I tried some various ways to achieve some voronoi veins unsuccessfully - maybe not connecting the nodes properly. I like the water shader idea and will try it on the next iteration where I'm changing the POV. 

[choronr]

Tried the water shader and it looks good. Still messing with the voronoi; but, no results yet.

[Dune]

Perhaps a default shader with some luminosity and translucency will also work, and be faster to render.

[choronr]

Thanks Ulco, would you have any suggestions regarding the 'voronoi' application? I have a few different clip files and tried the 'voronoi fractalized' clip file connecting it to a number of different places with no results.

[glen5700]

Hi Bob,
Another nice rendering...

A couple of weeks ago I started working on color in fractalized voronoi, I saw this thread and thought this might be of some help. Please don't mind this extremely poor rendering but this should give you some help.

Take a look at the functions, hopfuly they will make some sense, if not please let me know.

Glen

[choronr]

Hi Bob,
Another nice rendering...

A couple of weeks ago I started working on color in fractalized voronoi, I saw this thread and thought this might be of some help. Please don't mind this extremely poor rendering but this should give you some help.

Take a look at the functions, hopfuly they will make some sense, if not please let me know.

Glen

Hi Glen,

Thank you for this file. Since my two large stones are already a child to an existing shader, I've had difficulty trying to figure out where to connect your 'voronoi fractalized' clip file since it should be connected as a child to a surface shader. I will try your file here and get back to you with the results. Thanks again,

Bob

[Dune]

You beat me to it, Glen. Your cracks looks like good.

[glen5700]

Bob: Good luck with connecting it, I get lost sometimes on where to hook things up but with what your describing it sounds more complex.

Dune: Thanks!