ofEnableDepthTest with ofGLProgrammableRenderer

beginners
#1

Hello,

I am using 6 outer surfaces of a NURBS volume to create a volumetric view.
Using the default renderer and ofEnableDepthTest() Invisible lines are not drawn as expected.
However if I switch to ofGLProgrammableRenderer, ofEnableDepthTest has no effect.

I am using VS2012 on Windows 8.1

As an OpenGL beginner I was wondering if there were any other steps to make ofEnableDepthTest and ofGLProgrammableRenderer work.
Any advice is appreciated.

Thanks.

#2

can you post some images? depth testing is activated with the same call using the programmable renderer so it might be something else. are you drawing using alpha?

#3

As a new user I cannot upload images so please forgive the links.

With default renderer : http://i41.tinypic.com/3585ndk.png
With programmable renderer : http://i39.tinypic.com/2ik5ush.png

The only difference in two images is the code :
ofSetCurrentRenderer(ofGLProgrammableRenderer::TYPE);

The shape is composed of six ofmeshes and a series of ofCircle meshes.
Colors are set using predefined ofColors ie ofColor::darkBlue;

Other than ofEnableDepthTest(); I don’t apply any other settings.