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Primitives that have no textures are rendered with the color specified by their material, or with the colors specified for the vertices, if any. You can select the method to fill them by specifying a value defined by the D3DFILLMODE enumerated type for the D3DRS_FILLMODE render state.
To enable dithering, your application must pass the D3DRS_DITHERENABLE enumerated value as the first parameter to IDirect3DDevice9::SetRenderState. It must set the second parameter to TRUE to enable dithering, and FALSE to disable it.
At times, drawing the last pixel in a line can cause unsightly overlap with surrounding primitives. You can control this using the D3DRS_LASTPIXEL enumerated value. However, do not alter this setting without some forethought. Under some conditions, suppressing the rendering of the last pixel can cause unsightly gaps between primitives.
Object outlines can be drawn by setting the appropriate line drawing pattern. The default line drawing state is to draw solid lines. For more information, see Line Drawing Support in D3DX render state.