[K3d-development] Shader Design Challenge - COR-TEN steel

[Daniel S. M. <dsm...@gm...>]

Something that I am working on at the moment is getting my head around
this building material and how to write one or more shaders to
realistically simulate it.

http://www.flickr.com/groups/309747@N24/pool/


As you can see it changes over time.

http://www.flickr.com/photos/vcastelo/3050449296/sizes/l/in/pool-309747@N24/

http://www.flickr.com/photos/26973925@N06/2637456163/sizes/l/in/pool-309747@N24/


Anyone have any ideas how to go about it, with layers perhaps?