作业一阴影很小

[由乃克斯]

作业一阴影很小，不知道是哪里的问题，求教

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[tftl]

看上去像是projection的cube参数有问题，先画一下shadowmap看看
具体方法参考这里

• This reply was modified 3 years, 8 months ago by tftl.

[zhishao]

SM取出来的值unpack后已经在[0,1]了，不需要再归一化到[0,1]了

[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;
}

[小夜子]

haha，我一开始也这样犯这个错误。要先对vPositionFromLight归一化再去用，不然会被齐次坐标最后一项给影响到。

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