non-planar       
adjective  mathematics specialized (also nonplanar) uk/ˌnɒnˈpleɪ.nər/ us/ˌnɑːnˈpleɪ.nɚ/
 不平整的
having a surface that is not flat or level in all directions
  The vehicle was driven over a slightly non-planar terrain. 车辆在一个略微不平的地形上行驶。 
 This technology can be used to form nonplanar images.
  - More examples
 - The semiconductor has a non-planar surface.
 - The wing 0f the is slightly non-planar over some of its span.
 - The material can be formed into more flexible non-planar surfaces.
 - A nonplanar system can disturb a larger mass of air and create less energy and drag.