When ON , operations such as tumbling, tracking, or surface modification occur in wireframe mode. Once you stop using the mouse, the model is displayed in shaded mode. The light is locked to the camera and moves with the camera when tumbling or tracking. Low subdivision is used for all surfaces. Trim surfaces use the adaptive subdivision settings, all other surfaces use the uniform subdivision settings.
Faces use the U divisions value of uniform subdivisions.
If you want to view your object in shaded mode with the textures and lighting in your scene, click to turn Tgl shade off, toggle Fast Options OFF, and click to restart Tgl shade . When to use Toggle Shade Tgl shade works best with relatively uncomplicated scenes. The process of updating the window slows down when geometry is changed and must be recalculated. If a surface appears very dark or black, the surface normals may be inside out. You can change the direction of the surface normals using Object Edit Reverse Edit surface normals.