EffectsChannel, also known as Material/Object ID Manage, is a 3ds Max script by Kstudio for managing Material and Object IDs. It assigns wirecolor for objects and can assign IDs to materials by material type.
The script automates render element creation for multiple renderers: MultiMatteElement for V-Ray, MatteRenderElement for Mental Ray, and CMasking_Mask for Corona Renderer. It can also render a mask for selected objects by materials, a feature available for V-Ray only. That mask covers all materials present on the selected objects, and if an unselected object shares a material with a selected one, its material is rendered as well. Random mode renders the mask for all objects, with RGB pass 1, RGB pass 2, RGBYCMW, and Random options; RenderTime and RenderSize match the current render settings.
EffectsChannel is included in the Kstudio TrackScripts pack and runs with 3ds Max 2016 and above. Version 1.67.4 brought fixes and speed improvements, following earlier work that reduced opening time on very large scenes.