Shadow Volumes problem

Hi all, i try to work with sadow volumes. I use openGL state like this :

init:
    glEnable (GL_DEPTH_TEST);
    glEnable (GL_STENCIL_TEST);
    
    glDisable(GL_CULL_FACE);
    glDisable(GL_DEPTH_CLAMP);
    glDepthFunc(GL_LEQUAL);
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    glClearDepth(1.0f);
    glClearStencil(0);
....

render function

 glClearColor(0.0,0.0,0.0,0.0);
 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT |GL_STENCIL_BUFFER_BIT);

for (unsigned int i = 0;i < collector->nodes.size();i++)
        collector->nodes[i]->render(SVDiff); // ambiant rendering

    glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
    glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP);
    glStencilFunc (GL_ALWAYS, 0, ~0);   
    glClear(GL_STENCIL_BUFFER_BIT);
    glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
    glDepthMask(GL_FALSE);

    for (unsigned int i = 0;i < collector->nodes.size();i++)
         collector->nodes[i]->render(SVShad);// render of shadow volumes in the stencil buffer

    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
    glDepthMask(GL_TRUE);
    glClear(GL_DEPTH_BUFFER_BIT);
    glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_KEEP);
    glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_KEEP);
    glStencilFunc (GL_EQUAL, 0, ~0);

        for (unsigned int i = 0;i < collector->nodes.size();i++)
         collector->nodes[i]->render(SVMat);//spec and diff rendering

As result i obtain a good shadow but shadow volumes are still visible.

Any idea?

Even aside from your visible shadow volumes, it doesn’t appear certain from your picture that shadow volumes are working properly yet.

In any case, typically shadow volumes are rendered to the stencil buffer only (i.e. with color and depth writes disabled). Try that.