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What does each of the five Material Painter modes do and how can I use them?
The Material Painter modes help you specify exactly what is painted when you use the Material Painter tool. To access the list of modes, while in a camera view, select 3D> Material Painter> Material Painter from the menu. A check mark indicates the mode that is currently active.
Component Mode
By default, when you first activate the Material Painter, Component Mode is selected. This mode applies materials to the component of an object when you click on that particular component.
Object Mode
As its name implies, the Object Mode applies materials to an entire object.
Room Mode
Room, Floor and Plan modes can make extensive changes to a plan, and sometimes give you results that you do not expect. Carefully consider the possible results before you select one of these modes.
If you activate the Room Mode for the Material Painter, it applies materials to every object in a room that has the same original material.
Floor Mode
The Floor Mode applies materials to every object that has the same original material and is on the same floor of the plan.
Plan Mode
The most extensive changes can be made by activating Plan Mode. Use this mode to apply materials to every object in the plan that has the same original material.