A solution of SDF modeling shear issue.

Story:

e.g. if you are shearing by X in 3D:

Then you wanna do sheared SDF box like i.q. :

It's gonna broken (because when SDF Trace,the distance to box is not correctly calculated?):

By this pdf I found,although it doesn't give an answer,I was inspired.

"《Interactive Modeling with Distance Fields》 Tim-Christopher Reiner"

After I done my calculation,the fixed Sheared SDF Box code is here:

Now the box is fixed:

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Addition:

Later I found the code above neglected?negative shear and 0 situation.

Here is the code fixed:

Finally it's fixed...

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Thumb me if it helps.:)

I wrote this in English beacuse I didn't found a solution at google or shadertoy.I hope this may help someone someday.