The Shader Effects used the computers graphics card to render predefined shader program/algorithm files. This files are commonly used in video games to render graphics. xLights only support a few shader files formats. Known working shader files can be downloaded with the "Download" button. Once a shader file is loaded, additional settings slider could appear related to the shadder. These setting are defined by the shader files itself and change parameters used by the underlying shader program/algorithm. Some shader files require canvas mode to be enabled, hover over the file name and the tooltip will display this information.