Description:

Get the "u" tangent direction (actually first derivative) to interpolate at the u,v parameter location.

Syntax:
public Vector3d UTangentAt(
int uIndex,
int vIndex
)
Parameters:
  • uIndex
  • Type: int
  • The "u" index.
  • vIndex
  • Type: int
  • The "v" index.
Returns:
Type: Vector3d
The tangent direction.
Available since:
7.0

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