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The blend map reports a quad's SIZE, which identifies an element and says nothing about whether it is visible -- a parked quad is still a draw call. This prints the NDC x/y range and per-vertex colour of every additive draw, per frame, so movement between frames and overlap with the [-1,1] box are readable directly. Written because sylpheed-port flagged exactly that conflation in my blend page: the blend and the visibility arrived in the same artefact. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v