Maya: Export ramp attribute samples to JSON. Sample multiple times along the ramp curve for its value.

maya_sample_ramp_attribute.py

import maya.cmds as cmds
import maya.api.OpenMaya as om
import json


def get_ramp_attribute(attr):
    """Return MRampAttribute for attribute name."""
    sel = om.MSelectionList()
    sel.add(parm)
    plug = sel.getPlug(0)
    return om.MRampAttribute(plug)


node = cmds.ls(selection=True)[0]  # first selected node
attr = node + '.value'
ramp = get_ramp_attribute(attr)

samples = 100   # amount of samples
step = 1.0 / (samples - 1.0)


values = {}
for sample in range(samples):
    position = sample * step
    value = ramp.getValueAtPosition(position)
    values[position] = value

# Write out to json
with open("S:/maya_ramp_attribute_samples.json", "w") as f:
    json.dump(values, f)