Download and Run Instructions for Shader Mode
1. Download and extract the ShaderMode.zip package (at the end of the page) to Documents->Processing->modes if Documents is the default location for your Processing sketches. See sample images below.
2. Make sure you have Processing 3.1+ version installed on your computer. You can download from here https://processing.org/download/
3. Run the Processing PDE application from the installed directory
4. Once PDE launches switch to Shader Mode from the modes menu in the top right corner
Note: If you don't see Shader Mode in the modes drop down menu make sure you placed the ShaderMode package in the correct directory.