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Percentage Closer Soft Shadows: ( combined with jumpflood ) how estimating correctly penumbra size ( diagrams inside )

evelyn4you · 2022-05-25T08:58:38

Hi, i am working on softening my raytraced pixel perfect hard shadows. I dont want to use sample and denoise technique but i use jumpflood technique. jumpflooda. that means for every pixel in the hard shadow texture is the pixel coordinate to the NEAREST light pixel calculated.b. if the distance of a shadow pixel = 1 pixel we have a border pixel between shadow und darknessin the following diagrams you can see how the information by reprojection is used to calculate the penumbra size of the shadow pixels.- for every shadow pixel the coordinate of the nearest light pixel is read- the distance of the WORLD coordinates of theese two pixel is calculated- the lenght of the distance of the world penumbra size is proportional to the distance in pixels in screen space with an analytical formula, without bluring pixels we can have a nice soft shadow with big penumbra sizesIt works so far, but i cannot correctly estimate the penumbra size because there are REAL border pixels and FAILED border pixles which leads to a white coronna ( soft shadow ) around objects.I did a lot of work to make some diagrams to show exactly what is going on.Could please, please someone help me