Hi,

the shadow on the wall is probably created, because the wall is outside of the 
shadow cameras view frustum. How do you setup the wrapping of your depth 
texture? You could fix it, if you set the mode to clamp to border and set the 
border "color" to your far plane. This way everything that cannot be seen from 
your light source will not be shadowed(as in is outside of the view frustum).
The shadow on your torus looks like a self shadowing problem. You will always 
have some errors because of the limited floating point precision. You should 
use a small offset in your depth comparison to get rid of this artifacts. A bit 
of tweaking will be necessary to get a good value.
The last bug is indeed a bit strange. I'm not sure how it is produced. But it 
is view dependent, so it must have to do something with the view matrix of your 
main camera.

Thank you!

Cheers,
Marcel

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