Analysis > Options > Planar

Subdivide non-planar quadrilaterals into triangles – during intersection analysis.

Moderately non-planar surfaces do not pose a problem for Map3D. However, extreme warping of surfaces can interfere with the intersection analysis.

Notes

This function must be checked before conducting the intersection analysis

Analysis > Intersections.

This can result in an increase in problem size thus increasing analysis time.

It is recommended that do not check this option unless you specifically want to eliminate non-planar features.