Godot Eyesee Color Plugin

Simulate color vision deficiencies directly within the editor to identify accessibility issues. You can watch an overview here.

Supported filters:

• Protanopia
• Deuteranopia
• Tritanopia
• Achromatopsia

Filters can be selected via the “CVD” dropdown in the main menu panel for both 2D and 3D screens. The plugin works by inserting shader materials into all subviewport containers. Note: As a limitation, this also affects gizmos.

Simulation methods:

• Protanopia and Deuteranopia are simulated using the method described by Viénot, F., Brettel, H., & Mollon, J. D. (1999): Digital video colourmaps for checking the legibility of displays by dichromats. Color Research & Application, 24(4), 243–252. PDF link. This method is fast and stable.
• Tritanopia is simulated using the method by Brettel, H., Viénot, F., & Mollon, J. D. (1997): Computerized simulation of color appearance for dichromats. Journal of the Optical Society of America A, 14(10), 2647–2655. DOI. This is the most accurate simulation for tritanopia.
• Achromatopsia is simulated using the luminance formula from ITU-R BT.601. ITU spec

For a great article on color blindness and simulation methods, visit: daltonlens.org/opensource-cvd-simulation.

These shaders are based on the excellent open-source library: github.com/DaltonLens/libDaltonLens.

Standalone canvas shaders are available here. (Also by me!)