1D transfer function (colour map) actor.

Description

The 1D transfer function actor provides a colour map that is (a) displayed in a scene, and that (b) can be used in other actors to map a data value to a colour.

  • Data scalar range can be adjusted, as well as number of colour steps, labels, tick marks and position of the colour map in the visualization.
  • The actor provides a number of predefined colour maps, as well as Hue-Chroma-Luminance (HCL) colour maps. For the latter, specification of HCL colour maps follows the website of Reto Stauffer.

How to...

...adjust the range of the values?

  • Open Transfer function scalar to colour (colour map) → actor properties → range
  • Set the minimum and maximum value according to the needs

...change the colourmap type?

  • Open Transfer function scalar to colour (colour map) → actor properties
  • Choose a colourmap type (options: "HLC", "Editor", "predefined", "HSV"). We recommend to choose a HCL colourmap. 
    1. HCL: Choose the type of the HCL color map (options: "diverging", "qualitative", "sequential single hue", "sequential multiple hue"). We recommend to use a tool like hclwizard to create a colourmap. 
    2. Editor: an integrated colourmap editor opens to create own colourmaps.  
    3. predefined: choose from predefined colourmaps 
    4. HSV: load a transfer function from Vapor XLM file

...adjust the positioning?

  • Open Transfer function scalar to colour (colour map) → actor properties → position
    • Change the X coordinate from -1 (left) to 1 (right)
    • Change the Y coordinate from -1 (bottom) to 1 (top)
    • Adjust the Width and Height of the colourbar displayed in the scene


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