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Stenciled Decals Problem

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I am trying to wrap a quad to the contour of the terrain using the stencil buffer. However, it does not wrap at all :(.
    if(Stencils.size()) {
        glEnable(GL_STENCIL_TEST);
        glColorMask(0, 0, 0, 0);
        glDisable(GL_DEPTH_TEST);
        glStencilFunc(GL_ALWAYS, 1, 1);
        glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);

        renderTerrainFast();

        glColorMask(1, 1, 1, 1);
        glStencilFunc(GL_LEQUAL, 1, 1);
        glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);

        for(u32 i = 0; i < Stencils.size(); i++) {
            if(Stencils->Enabled) Stencils->render();
        }

        glDisable(GL_STENCIL_TEST);
        glEnable(GL_DEPTH_TEST);
    }
Any help is appreciated.

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