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Overview of a renderer implementation: Look here.

Overview of the rendering procedures in mayaToCommon and related plugins:

First the plugin (e.g. mayatolux.mll) is loaded by the user. Then the plugin main procedure is executed:

• render nodes e.g. luxGlobals are loaded
• shader nodes are registered including their override nodes
• some globals are initialized
• the swatches renderer is registered
• for Maya2016 and up the new material preview renderer is registered (material preview page).
• the renderer is registered with the help of a python script

Then the plugin is loaded and waits for user actions. Normally we have three default situations where the plugin starts to work if:

• a shader swatch needs to be rendered
• a Maya2016 and up material preview needs to be calculated
• a UI/IPR/batch rendering is triggered

Swtach and material preview are automatically called by maya itself, the UI/IPR etc process is triggered by a click on the buttons in the render windows. The procedures which will be called are defined in the renderer registration python script.