Microsoft DirectX 8.0 (Visual Basic)

CONST_D3DBASISTYPE

Defines the basis type of a high-order surface.

Enum CONST_D3DBASISTYPE
    D3DBASIS_BEZIER      = 0
    D3DBASIS_BSPLINE     = 1
    D3DBASIS_INTERPOLATE = 2
End Enum

Constants

D3DBASIS_BEZIER
Input vertices are treated as a series of bézier patches. The number of vertices specified must be divisible by 3 + 1. Portions of the mesh beyond this criterion will not be rendered. Full continuity is assumed between sub-patches in the interior of the surface rendered by each call. Only the vertices at the corners of each sub-patch are guaranteed to lie on the resulting surface.
D3DBASIS_BSPLINE
Input vertices are treated as control points of a B-spline surface. The number of apertures rendered is 2 less than the number of apertures in that direction. In general, the generated surface does not contain the control vertices specified.
D3DBASIS_INTERPOLATE
An interpolating basis defines the surface so that the surface goes through all the input vertices specified.

Remarks

The members of D3DBASISTYPE specify the formulation to be used in evaluating the high-order surface primitive during tessellation.

See Also

D3DRECTPATCH_INFO, D3DTRIPATCH_INFO