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====== Variables (Angle, Colour, Distance, Percentage, Position, Rotation, Scalar, Scale) ======
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These nodes correspond to the native "Constant" nodes.

However, they have optional evaluation modes controlling how their values are retrieved if they are animated via an envelope:

  * **Per Frame** \\ Just like with the native Constant nodes, the value will be retrieved once per frame
  * **Interpolated** \\ This will retrieve the value for the current and next frame and interpolate between them in the case of motion blur
  * **Per Sample** \\ This fully evaluates the envelope every time and may be quite slow

You can use the output of these nodes to, for example, change the position of a texture and have that change in position be motion blurred.

**Interpolated** is the preferred method to use, **Per Sample** should only be used if the result of **Interpolated** isn't accurate enough.

As of Version 2019.01.02, the nodes also have a Time input and a corresponding Time Range control.

If the Time input is connected, the Time Range control will be available and the evaluation modes will be disabled. In this mode, the scalar connected to the Time input will be used directly as a current time when evaluating an enveloped Value of the node.

The Time Range control determines which range of the envelope is equivalent to a range of 0..1 of the Time input scalar. I.e. if the Time Range is 4.0 (s), in a 30fps scene, then a range of 0..1 on the Time input will be equivalent to 0..120 frames on the envelope.

This allows you to use any enveloped value as a gradient, by connecting the Time input to something that would normally drive a gradient.

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