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.
From a speaker component perspective, it’s again quite similar to the Era 100. It has two tweeters positioned at a 90-degree angle for stereo separation paired with one midwoofer; it also has two additional passive radiators to increase the bass response in its relatively small case. The Era 100 lacks those passive radiators but is otherwise identical. Obviously, we’ll have to listen to the Play before saying how closely it compares to the Era 100, but this speaker should significantly outperform the Roam 2 simply due to the increased size of its components. The Move 2, on the other hand, is extremely loud and will likely still be the best choice for people who want a speaker to cover a large outdoor space.
，这一点在viber中也有详细论述
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