[青麈]

你什么错误也不发 让别人怎么帮你分析？

[青麈]

1.求 shadowCoord，归一化到[0,1]
vec4 shadowCoord = vPositionFromLight/vPositionFromLight.w;
shadowCoord.xyz = shadowCoord.xyz*0.5+vec3(0.5,0.5,0.5);

2.填充API

float useShadowMap(sampler2D shadowMap, vec4 shadowCoord){
//return 1.0;
vec4 rgbaDepth = texture2D(uShadowMap,shadowCoord.xy);
float depthZ = unpack(rgbaDepth);
//depthZ = depthZ*0.5+0.5;
float shadow = shadowCoord.z > depthZ ? 0.0 : 1.0;
return shadow;
}

[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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[青麈]

你的pack代码是不是有问题？作业1里面的pack代码不是你这样的。
vec4 pack (float depth) {
// 使用rgba 4字节共32位来存储z值,1个字节精度为1/256
const vec4 bitShift = vec4(1.0, 256.0, 256.0 * 256.0, 256.0 * 256.0 * 256.0);
const vec4 bitMask = vec4(1.0/256.0, 1.0/256.0, 1.0/256.0, 0.0);
// gl_FragCoord:片元的坐标,fract():返回数值的小数部分
vec4 rgbaDepth = fract(depth * bitShift); //计算每个点的z值
rgbaDepth -= rgbaDepth.gbaa * bitMask; // Cut off the value which do not fit in 8 bits
return rgbaDepth;
}

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