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A cube requires 6 faces, 12 triangles, and thus 36 vertices. However, in the geometry used for skyboxes, the vertex array obtained using getFullScreenVertexBuffer only has three vertices.
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There's no need to build a cube. We use a single triangle that covers the entire screen and compute the view direction at each fragment in the shader (we do this in the vertex shader). That view direction is all that's needed to sample the cubemap. |
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Thank you for your explanation, I understand now. |
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There's no need to build a cube. We use a single triangle that covers the entire screen and compute the view direction at each fragment in the shader (we do this in the vertex shader). That view direction is all that's needed to sample the cubemap.