The following rotates the location of the view located at (0, 0, 3000)
and directed towarded (0, 0, -1) (into the screen) by 90 degrees around the Y axis,
without changing the view location.
#define VIEW_PX 0.f
#define VIEW_PY 0.f
#define VIEW_PZ 3000.f
#define VIEW_VX 0.f
#define VIEW_VY 0.f
#define VIEW_VZ -1.f
#define VIEW_ROLL 0
NJS_VIEW v;
v.px = VIEW_PX;
v.py = VIEW_PY;
v.pz = VIEW_PZ;
v.vx = VIEW_VX;
v.vy = VIEW_VY;
v.vz = VIEW_VZ;
v.roll = NJM_DEG_ANG(VIEW_ROLL);
njRotateViewYRelative(&v, NJM_DEG_ANG(90));
njSetView( &v );