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The 3D Viewer displays a grid that’s used to provide a plane of reference in the 3D scene. By default, the grid is 24 x 24 units in size, centered on the origin at (0,0,0), and subdivided into large squares of 2 units with small squares of 0.25 units each. These defaults can be altered in the 3D View panel of the Fusion Settings window, available from the Fusion menu.
— Right-click anywhere within the 3D Viewer and choose 3D Options > Grid from the contextual menu.
The default grid of the 3D Viewer grid with its origin at x = 0, y = 0 and z = 0
Vertex Normals
Normals indicate what direction each vertex of 3D geometry is facing, and they are used when calculating lighting and texturing on an object. When viewing any kind of 3D geometry, including an image plane or a full FBX mesh, you can display the normals for each object in a scene.
— Right-click anywhere within the viewer and choose 3D Options > Vertex Normals from the contextual menu.
The normals viewed in a 3D scene