硬阴影结果诡异，不知哪里错了

[四上悠亚]

`
CalcLightMVP(translate, scale) {
let lightMVP = mat4.create();
let modelMatrix = mat4.create();
let viewMatrix = mat4.create();
let projectionMatrix = mat4.create();

mat4.identity(modelMatrix);
mat4.identity(lightMVP);
mat4.identity(viewMatrix);
mat4.identity(projectionMatrix);
// Model transform
// dest mat, source mat, operation mat
mat4.translate(modelMatrix, modelMatrix, translate);
mat4.scale(modelMatrix, modelMatrix, scale);
// View transform
mat4.lookAt(viewMatrix, this.lightPos, this.focalPoint, this.lightUp);
// Projection transform
mat4.ortho(projectionMatrix, -100, 100, -100, 100, -100, 100);

mat4.multiply(lightMVP, projectionMatrix, viewMatrix);
mat4.multiply(lightMVP, lightMVP, modelMatrix);

return lightMVP;
}
}

float useShadowMap(sampler2D shadowMap, vec4 shadowCoord){
float shadowMapDepth = unpack(texture2D(shadowMap, shadowCoord.xy));
if(shadowCoord.z > shadowMapDepth){
return 0.0;
}
return 1.0;
}

void main(void) {

float visibility;
vec3 shadowCoord = vPositionFromLight.xyz / vPositionFromLight.w;
shadowCoord = shadowCoord.xyz * 0.5 + vec3(0.5, 0.5, 0.5);
visibility = useShadowMap(uShadowMap, vec4(shadowCoord, 1.0));
//visibility = PCF(uShadowMap, vec4(shadowCoord, 1.0));
//visibility = PCSS(uShadowMap, vec4(shadowCoord, 1.0));

vec3 phongColor = blinnPhong();

gl_FragColor = vec4(phongColor * visibility, 1.0);
// gl_FragColor = vec4(phongColor, 1.0);
}

`

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[小夜子]

先加个bias，if(shadowCoord.z-bias > shadowMapDepth)，这样，bias设置成0.005，另外调整下正交矩阵的参数，感觉是范围太小了。

[张]

正交矩阵 near和far的问题，没有完全包围住场景

[remoo]

far平面不够

[Author]

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