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If I create a keyframe for a colour in Blender (I'm using 2.6) it always seems to traverse the RGB values for the animation, even if I set the colour using HSV values.

I do this by setting the colour, using HSV, then pressing i over it.

How can I animate the HSV values rather than the RGB values?

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It is possible by using material nodes. If you use a Hue Saturation Value node in your node setup, you can animate any of the HSV values with the same method as you described (pressing i key over the field that should be animated).

hvs animation in blender using nodes

In the screenshot you can see a possible setup. I'm using a HSV node as the input for the materials color. I set the base color-value of the HSV node to 0.5, 1.0, 1.0 (cyan blue), as this seems to produce correct output colors then (eg. a hue of 0.0 or 1.0 is red).

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