Method GetFaceNormal
GetFaceNormal(ElementItemId, double, double)
Gets the normal to the surface attached to a face at specified parametric values.
Declaration
[OperationContract]
[AvailableSinceVersion(7, 7, 0, 0)]
Direction3D GetFaceNormal(ElementItemId inFaceId, double inU, double inV)Parameters
| Type | Name | Description |
|---|---|---|
| ElementItemId | inFaceId | Identifier of the face to analyze. |
| double | inU | U parameter within face surface parametric range. |
| double | inV | V parameter within face surface parametric range. |
Returns
| Type | Description |
|---|---|
| Direction3D | Normal to the face surface at the specified parametric values. |
Remarks
If the face is reversed, the orientation of the normal is the opposite to the cross product of the U and V parametric first derivatives.
This method is available since v7.7.