Banding artifacts in surface mesh (fixed, update to 1.0.4a)

[rlguy]

A bug has been found in the new v1.0.4 particle mesher that could cause visible banding artifacts on the surface of the generated mesh. This issue has been fixed and will be included in a patched version v1.0.4a that will be available August 24th, 2018. It is highly advised to upgrade to the patched version as this update will fix some major bugs within the particle mesher (#372, #376).

This bug was caused by a 'off-by-one' error that would cause mesh calculations to be skipped, resulting in missing mesh data which is the cause of the banding ridges.