Object as transparent mask in Blender 2.8 Workbench engine I want to archive this effect:
Create invisibility cloak alpha mask material

But I can't find the option for transparent mask in the material tab in Blender 2.8's workbench engine. I can make the object transparent (by changing the alpha in its color settings), but then it will not mask other objects in scene. Is there a way to do it?
Material with Holdout Shader (in node editor: Shift A - Shaders - Holdout). Add that material to your blocking object.