VSM Shadows: Add support for setting the number of blur samples #22272
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…js into vsm-shadow-improvements
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Description
Adds support for setting the number of blur samples in the separable blur passes when using VSM shadow maps. Previously a fixed count of 8 samples was being used which is more than needed to get a good blur in some cases and a lot less than needed in others.
With this PR the user can set the amount of blur samples using the
blurSamplesfield: