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Editorial Team
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Asked: 2026-05-28T03:08:23+00:00

I wanted to see the wireframe of my triangle mesh, so rather than constructing

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I wanted to see the wireframe of my triangle mesh, so rather than constructing a whole new VBO I’m trying to use glPolygonMode and draw it again with the exact same draw call. This is because I can’t find a draw command that will let me make GL_LINE_LOOP primitives out of every 3 indices from my IBO.

But when I draw the wireframe, the insides of the triangles become black again. Is this because when a fragment is discarded, its color value is set to zero (black)? How could I set it so that a discarded fragment does not get written or blended? Are the fragments actually getting discarded?

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1 Answer

  1. Editorial Team

    I solved it. I set glPolygonMode(GL_FRONT_AND_BACK,GL_LINE) then neglected to set it back to GL_FILL, so all subsequent draws in my loop were wireframe. So it’s obvious why the polygons ended up not filled.

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