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See, in the scene, the top of the flag ends and becomes transparent at a different point then the bottom. I want the end to be straight, not slanted like I have now.

The scene I was working on (I apologize for the theme)

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    $\begingroup$ Could you spend a few words about your Texture coordinate node? What's the target object? What are it's rotation values? $\endgroup$ – Carlo Apr 7 '17 at 20:22
  • $\begingroup$ Also why are you multiplying your object coordinates by one? If you want a perfectly horizontal gradient you should be using exclusively the X component of the coordinates. $\endgroup$ – Duarte Farrajota Ramos Apr 8 '17 at 0:26
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Connecting different socket types is generally a bad idea. In this case you have the Object coordinates (a Vector - as indicated by the blue socket) connected to the scalar Value input of a Multiply Math node. This will automatically convert from the vector into a scalar (ie, a plain number) by averaging each of the X,Y,Z values of the vector together - not what you want. Instead, replace the Multiply node with a Separate XYZ node and then use whichever of the X, Y, Z outputs matches your requirements (probably X as indicated in the comments).

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Looks as if it might be doing something weird with the color ramp. It's going diagonal instead of left to right.

Edit: You need a gradient texture right after the mapping node to convert to color.

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