SketchUp Colorize Algorithm

This is a documentation of how SketchUp colorize materials using HLS shifting or tinting.

Ruby Variant

Found in src/ex_colorize/colorizer.rb.

The original implementation is in C++. This example is rewritten in Ruby. Beware minor precision differences where the original source used single precision float compared to Ruby which always uses double precision. This have been noted in the source code.

Open models/example.skp and run the tests:

• Extensions > SketchUp Colorization > Colorize
• Extensions > SketchUp Colorization > Validate

C++ Variant

Found in cpp/colorize.h and cpp/colorize.cpp.

This will produce the exact same result as SketchUp's own implementation. (At the time of writing this is SU2018.)