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I want to add a simple one-line driver to control the emissive color of a material in Cycles. I had assumed I either hover over the color and press 'D' or right-click and select 'Add Driver' from the context menu.

Neither of these options worked, so I searched around and found some forum posts that suggested finding the emissive color datablock in the outliner, but that did not work either.

Lastly, I tried the same shortcuts in the Node view of my Cycles material network. That also didn't work.

In all three cases I tried both right clicking the color AND right clicking the RGB values inside the color inspector.

I feel like I must be overlooking something extremely simple here, as driving a color property seems like a common task -- a natural next steap after animating a color property with keyframes.

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I am an idiot -- if the value is already keyframed you are not able to add a driver to it. Once I deleted all the existing keyframes I was able to add a driver.

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    $\begingroup$ Maybe accept this as an answer (after removing your personal judgment). $\endgroup$
    – U. Windl
    Mar 26, 2019 at 21:42

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