Material Editor > Viewport Shader rollout
Lets you select a viewport shader for viewing Direct3D hardware shaders. Viewport shaders require the Direct3D graphics driver, which uses DirectX. With DirectX shading, materials in a viewport more accurately represent how the material will appear in another application, or on other hardware such as a game engine.
Viewport shaders are especially useful for previewing texture-baked materials.
Note: This rollout does not appear for Multi/Sub-Object and Shell materials, which are simply containers of other materials.

Drop-down list—Use the drop-down list to choose a viewport shader.
Enabled—Turn on Enabled to use the shader in shaded viewports. Default=off.
When not enabled, viewports continue to use the default viewport (interactive) renderer (or the ActiveShade renderer, if that has been chosen).
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