Added new RGB Curves Link Node (II)

Закрыто nikitronn запросил слияние github/fork/spamrakuen/rgbcurvesnode в master

Created by: spamrakuen

Addressed problem description

Blender does not allow to add a curve editor in an addon UI. This makes dificult to "draw" a 2D line shape and then sample values from that line.

Solution description

This node allows to sample data from a Material's RGB Curve node.

Solution is based on this thread of stackexchange.com https://blender.stackexchange.com/questions/61618/add-a-custom-curve-mapping-property-for-an-add-on

In order to work, a material that use nodes should be created, then just drop a RGB Curves node.

This new node will sample values from that curve(s)

RGB Curves Link Node Screenshot

Preflight checklist

Put an x letter in each brackets when you're done this item:

  • Code changes complete.
  • Code documentation complete.
  • Documentation for users complete (or not required, if user never sees these changes).
  • Manual testing done.
  • Unit-tests implemented.
  • Ready for merge.