shadowmap2,扩展z值范围

书上是用rgba表示浮点型的z值,扩大了范围,但是大点了也会出问题。以后可能考虑用cascade shadowmap <html> <head>11</head> <body> <canvas id = "test" width = "800" height = "800">canvas </canvas> <script src = "webgltest/cuon-matrix.js"></sc
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