Behind camera culling.

[volcoma]

when behind the camera the gizmo is still rendered but wrong.
Add the following stuff to prevent this.

gContext.mCameraNearPlane.x = (gContext.mViewProjection.m[0][2]); gContext.mCameraNearPlane.y = (gContext.mViewProjection.m[1][2]); gContext.mCameraNearPlane.z = (gContext.mViewProjection.m[2][2]); gContext.mCameraNearPlane.w = (gContext.mViewProjection.m[3][2]);

and this

`void Manipulate(const float view, const float *projection, OPERATION operation, MODE mode, float *matrix, float *deltaMatrix)
{
ComputeContext(view, projection, matrix, mode);
// set delta to identity
if (deltaMatrix)
((matrix_t)deltaMatrix)->SetToIdentity();

    vec_t cameraEyeToGizmo = Normalized(gContext.mModel.v.position - gContext.mCameraEye);
    if (cameraEyeToGizmo.Dot3(gContext.mCameraNearPlane) < 0)
        return;'

[CedricGuillemet]

Shame on me!
And same applies to the debug cube display. That will be fixed tomorrow. Thank you!