作业1，PCSS 结果噪点很多，请教一下原因

[wuzhou]

block search 的实现：
`
float findBlocker( sampler2D shadowMap, vec2 uv, float zReceiver ) {
float searchWidth = LIGHT_UV_SIZE * (zReceiver – NEAR_PLANE) / zReceiver;
float blockSum = 0.0;
float blockNum = 0.0;
poissonDiskSamples(uv);
for (int i = 0; i < NUM_SAMPLES; i++)
{
float closestDepth = unpack(texture2D(shadowMap, uv + poissonDisk[i] * searchWidth));
if(zReceiver > closestDepth)
{
blockSum += closestDepth;
blockNum += 1.0;
}
}
return blockSum / blockNum;
}

光照宽度的定义和NearPlane的定义：
、
#define LIGHT_UV_SIZE 0.1
#define NEAR_PLANE 0.001

NearPlane 我是定义在 [0 , 1] 这个区间的，而且 NearPlane 的定义与光照投影矩阵的设置是否有关？
这是光照正交投影的设置：

mat4.ortho(projectionMatrix, -100, 100, -100, 100, -100, 1000);

PCSS 的实现

float PCSS(sampler2D shadowMap, vec4 coords){
vec3 projCoords = coords.xyz / coords.w;
projCoords = projCoords * 0.5 + 0.5;

// STEP 1: avgblocker depth
float avgBlockerDepth = findBlocker(shadowMap, projCoords.xy, projCoords.z);

// STEP 2: penumbra size
float filterSize = LIGHT_UV_SIZE * (projCoords.z – avgBlockerDepth) / avgBlockerDepth;

// STEP 3: filtering
float visibility = PCF(shadowMap, coords, filterSize);

return visibility;
}

• This topic was modified 2 years, 5 months ago by wuzhou.
• This topic was modified 2 years, 5 months ago by wuzhou.

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