Assembly: Microsoft.Xna.Framework (in microsoft.xna.framework.dll)
Polygons that are coplanar in your 3D space can be made to appear as if they are not coplanar by adding a z-bias to each one. An application can help ensure that coplanar polygons are rendered properly by adding a bias to the z-values that the system uses when rendering sets of coplanar polygons.
The following formula shows how to calculate the bias to be applied to coplanar primitives.
bias = (m × SlopeScaleDepthBias) + DepthBias
Where m is the maximum depth slope of the triangle being rendered, defined as:
m = max( abs(delta z / delta x), abs(delta z / delta y) )