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Patch

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Defines a Bézier control patch. The array defines the control points for the patch.

template Patch
{
    < A3EB5D44-FC22-429D-9AFB-3221CB9719A6 >
    DWORD nControlIndices;
    array DWORD controlIndices[nControlIndices];
}

Where:

  • nControlIndices - Number of control point indices.
  • array DWORD controlIndices[nControlIndices] - Array of control point indices.

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 rectangle 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 use the following pattern.

diagram of the pattern for triangular patches

Rectangular patches use the following pattern.

diagram of the pattern for rectangular patches

See also

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