assert widen([0, 2, 4], App("f", [Var(0), Var(1), Var(2)])) == App("f", [Var(0), Var(2), Var(4)])
The shadow map frustum is fitted to the camera view every frame. The visible area is projected into the light's coordinate system to compute the tightest possible bounding box, so no shadow map texels are wasted on off-screen geometry. Zoomed out, shadows cover the whole map at lower resolution. Zoom in, and the shadow map tightens to give you crisp, detailed shadows on individual tiles. This prevents blocky shadow artifacts when you zoom in.，更多细节参见WhatsApp Web 網頁版登入
，这一点在谷歌中也有详细论述
Note: some graphs were created using third party services or apps, however most were generated using my own visualization code using plotly.js.。wps是该领域的重要参考
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