development of our base shader

The base of the shader is consist of a simple noise function to create differentiation of colours in the shader. A simple diffuse function and an image option ability is also added to input our generated texture.




The next step now is to apply  specular characteristics and some reflection, refraction.

Added research dev

To further expand the solution for the shader I look into the growth of ice because frost is physically the same as ice. One of the technical paper I look into was the Physically Based model of ice and this was a useful insight of how ice grow. 
http://dl.acm.org/citation.cfm?id=1186240&dl=ACM&coll=DL&CFID=303806934&CFTOKEN=22446017
To get a physical representation a youtube video was very helpful in explaining this phenomena.

Problems

There are a couple of problems I encounter after creating the pattern in python. How do we display this in our shader? Questions arise such as how do I convert this to RSL and what function within the RSL we can use to mimic the turtle module commands? After doing some reading and a lot more thinking I decided to create the procedure in a RIB file or with MAYA . Basically we create the loop then establish a variable that would receive the position of the lines then display it in RIB with RiPoint primitive or in MAYA using some polygons or curves.

the Workflow

To run our procedure a renderman procedural primitive is essential basically its a simple code which looks like this

Procedural "RunProgram" ["C:\\Python33\\python.exe C:\\Users\\Rami Fetizanan\\Desktop\\simpleSphere.py" "1"]
        [-1 1 -1 1 -1 1]


For more about procedural primitive here are links :
http://www.dotcsw.com/doc/procedurals.html
http://www.fundza.com/rman_helper/basics1/