This page contains reference documentation for the VertexNormals member. This member toggles vertex normal display.
int VertexNormals;
Examples are as follows:
a_oView.VertexNormals = !a_oView.VertexNormals; a_oView.VertexNormals = 1; a_oView.VertexNormals = 0;
For sample code: