Accessing Ramp Attribute within compute()

[Sebastian Schoellhammer]

Hello again!

I'm working on a custom loft-style node as a scripted plugin.
One thing I wanted to do is having a Ramp Control the silhouette of the loft.

I added the MRampAttribute via:

MakeChain.overallScaleRamp = om.MRampAttribute.createCurveRamp("overallScale", "overallScale")
MakeChain.addAttribute(MakeChain.overallScaleRamp)       
MakeChain.attributeAffects( MakeChain.overallScaleRamp, MakeChain.outputMesh);

And I even managed to write a template that shows the little graph as well. Wow!

My last problem is though how to finally access the attribute in compute. 

Usually getting attributes is convenient via the data handle (.asFloat()) but in this case it's not that easy I guess.. :/

I tried to do create the attribute within compute as in:
ramp = om.MRampAttribute(self, self.overallScaleRamp)

but that doesn't seem to be any good...

Any hints?

seb

[Sebastian Schoellhammer]

Ok!!

Chad Vernon was so kind and pointed me in the direction of the following scripted plugin (cool!):
http://vimeo.com/13150202

( which uses a ramp :) )

and luckily it comes with source! So if anybody runs into this, this is how it works:

thisNode = MakeChain.thisMObject(self)
suOverallScale = om.MScriptUtil()
overallScaleValue = suOverallScale.asFloatPtr()
overallScaleHandle = om.MRampAttribute(thisNode, self.overallScaleRamp)
overallScaleHandle.getValueAtPosition(spacing*i/curveLength, overallScaleValue)
overallScale = om.MScriptUtil().getFloat(overallScaleValue)

Yay!

--
Sebastian Schoellhammer

Sr. Technical Artist
Square Enix LTD
www.square-enix.com

[Sachin Shrestha]

Awesome! Thanks for sharing. I can't believe its free along with the source code (while similar plugins are on sale).

-Sachin Shrestha