| Microsoft DirectX 8.1 (C++) |
Defines a bézier control patch. The array defines the control points for the patch.
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| Member name | Type | Optional array size | Optional data objects |
|---|---|---|---|
| nControlIndices | DWORD | None | |
| controlIndices | array DWORD | nControlIndices |
The type of patch is defined by the number of control points, as shown in the following table.
| Number of control points | Type |
|---|---|
| 10 | Cubic Bézier Triangular Patch |
| 15 | Quartic Bézier Triangular Patch |
| 16 | Cubic Bézier Quad (Rectangular) Patch |
The order of the control points are given in a spiral pattern, as shown in the following diagrams for triangular and rectangular patches.
Triangular patches used the following pattern.
Rectangular patches use the following pattern.
