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Transfer function actor improvements

Thorwin Vogt requested to merge thorwin.vogt/met.3d:devel_transfer_function_improvements into master

Several improvements to the transfer function actor.

For one, a new option to fill in HCL colour bars, where normally the values would exceed the range of RGB values when converted. This simply clamps the converted values to the range [0, 1]. It affects the transfer function editor and the HCL colour bar settings.

Also, added support for the scientific colour bars made by Fabio Crameri (Scientific colour maps), which will be automatically loaded when they are present in the third-party folder of the Met.3D base directory.

You can also point the scientificcolourmapdir option in the frontend config to your folder of the scientific colourmaps 7.

Also added support to automatically load vapor or paraview xml colourmaps from directories listed in the frontend configs ColourMapDirectoriessection.

Removed the HSV section in the Transfer function actor and instead integrated it into the predefined colourmaps. They now feature a selection dialog, where you can also load colourmaps from vapor files (Old HSV option) or praraview xml files.

Edited by Thorwin Vogt

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