BCGSuite for MFC
void CBCGPChartDiagram3D::SetCalculateNormals ( BOOL  bSet)

Specifies whether polygon normals should be calculated during rendering.

By default calculation of normals is turned off. Enable it if you need some OpenGL customization (like lighting) that requires polygon normals.

Parameters
bSetTRUE - enable calculation of normals; FALSE - disable calculation of normals.