translate(NaN NaN) is silently ignored: read the isometric trig values from the camera object, not the projection

Domain: frontend · Evidence E1 — Maintainer reviewed

svgisometricnantransformheadless-chromedebugging

Summary

做等距 SVG 交互图（anatomy kit 类）时，自写的屏幕位移函数直接从 projection 对象上取 `sinA` / `cosA` / `k` 来算 `translate`——但该 projection 只存 `scale` / `azimuth` / `elevation` / `origin`，三角值…

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