Undefined_Surface_Normal

This check verifies whether the model contains surface segments with undefined normals. If so, the elements are considered as incorrect.

This page discusses:

Context

The normal of a surface segment is considered as undefined when the cross product of tangents in the points to be tested equals zero or is approaching zero.

You can obtain an undefined normal in the following situations:

  • One of the four surface boundaries is smaller than the size of the mini-element.
  • The angle between the isoparametric curves U and V equals zero at a given point.

An undefined normal can cause problems during the creation of offsets; it prevents you from determining the direction of the offset.

Note: If the tolerance angle value of the undefined normal is exceeded, the surface can also become wavy.

Check Information

Check Details Description
Applicable to: PartFeature
Automatic Solution:
Check Parameters:
  • MinLengthPatchBoundary: Length type.

    Specifies the minimum length value allowed for a patch boundary.

  • MinLengthOfNormal: Length type.

    Specifies the minimum length allowed for a normal. Above this value, the normal is considered as incorrect.