PyMel[Maya] accesing hue in color

dlz

I'm developing a tool regarding shaders in Maya and I'm learning pymel to do it (until now i rely in maya.cmds and mel).

I like pymel a lot but i'm having trouble to understand the hierarchy of nodes like color. i know that you can set a color in a shader like this:

selObj = pm.ls(sl=1)

blinnDark = pm.shadingNode('blinn', asShader=True)

blinnDark.color.set([0.3, 0.3, 0.3])

pm.select(selObj)

pm.hyperShade( assign=blinnDark )

How can I access to attributes like hue, saturation, value and edit and set them?

poopipe

AFAIK you need to give the materials rgb values.

A quick Google suggests maya doesn't have any built in functions to do the rgb-hsv-rgb conversion so I'd suggest using PIL or one of the other image libraries to deal with the maths because vanilla python is ill suited to the sort of sums you have to do.
Normally I'd say to use openCV for this sort of things but getting that running inside maya is a hell of an ordeal

dlz

Thanks for the reply. Searching in the documentation there's a datatype named color that has a "hue" attribute https://help.autodesk.com/cloudhelp/2016/ENU/Maya-Tech-Docs/PyMel/generated/classes/pymel.core.datatypes/pymel.core.datatypes.Color.html?highlight=color#pymel.core.datatypes.Color.h

But i don't know how to make it work for a shader.

I think in the end I'll use PIL as you suggest if i didn't succeed that way

poopipe

If you want to adjust the hue etc. you need to covert from rgb space to hsv, make the adjustment and then convert back again.
However, it does look like the color class covers all that. You probably just need to tell it which type when you set  it as per this.. 
set(colorModel, c1, c2, c3, alpha=1.0)

dlz

@poopipe

I tried some things and finally managed to get what I want that way:

selObj = pm.ls(sl=1)
<p>blinnDark = pm.shadingNode('blinn', asShader=True)</p>
<p>color1 = pm.datatypes.Color([0.5, 1, 0.2], h = 0.3)</p>
<p>#change the hue of color1</p>
<p>color2 = pm.datatypes.Color(color1, h = 0.7)</p>
<p>blinnDark.color.set(color2)</p>
<p>pm.select(selObj)</p>
<p>pm.hyperShade( assign=blinnDark )</p>

hope it could be useful for someone struggling with the same problems there