vPositionFromLight.z 恒为 0

[wangshengyang]

实现硬阴影失败，完全没有阴影。发现 vPositionFromLight.z 恒为0，因为把它当作 gl_FragColor 的 r 通道输出，屏幕是黑的。

不知道怎么回事。
附上我的mvp矩阵

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[wangshengyang]

发现不是0，是负值

[wangshengyang]

原因：z坐标忘了转到0到1

[青麈]

let left = -100
let right = 100
let bottom = -60
let top = 100
let near = -420
let far = -40
正交矩阵的参数，仅供参考。
调了半天、、、

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