Changes in version 2025-09-13                      

  - CRAN release

                     Changes in version 2025-08-03                      

  - [9000] Update to focus on SDF. Isocubes are used as an example
    renderer
  - [9001] Moved SDF/CSG to another package
  - [9002] Allow different coordinate systems
  - [9003] Faster rendering with viewports for offset
  - [9004] add demo data. tidy.
  - [9005] fix compatability issue with output from lofifonts
  - [9006] Faster colour handling
  - [9007] Visibility check now done in C. Preparing the way for
    per-face visibility check
  - [9008] Turn off default visibility check when creating heightmap
  - [9009] Allow cube border color to be set to the same as face color
  - [9010] Use 'colorfast' package for color conversion
  - [9011] xyplane = 'flat' by default
  - [9012] transforms: translate, rotate, align
  - [9013] export visibility checks
  - [9014] refactor visibility checks. add object generation.

                     Changes in version 2022-08-04                      

  - New single-pass, deterministic visibility checking algorithm.
      - Replaces the prior limited-depth, iterative technique.
      - 4x faster
      - Determines correct visibility for all cubes in scene

                     Changes in version 2022-07-30                      

  - Wrote a cheap, but inaccurate colour darkening function
    cheap_darken()
      - Quite a bit faster than colorspace::darken()
      - Removed colorspace as a dependency

                     Changes in version 2022-07-10                      

  - Added a light argument to specify lighting direction
      - renamed fill_left and fill_right to fill_left and fill_right
        respectively

                     Changes in version 2022-06-23                      

  - Replaced max_y argument with its inverse ysize
  - Added Signed Distance Fields (sdf_*()) for
      - object creation
      - object transformation
      - object combinations

                     Changes in version 2022-06-21                      

  - calc_heightmap_coords()
      - Corrected an accidental matrix transposition.
      - Added flipx, flipy and ground arguments for easier orientation
        adjustments.
  - isocubesGrob update:
      - Renamed args to x and y.
  - Updated README examples

                     Changes in version 2022-06-20                      

  - Initial release