improve occlusion culling with transparent pixels

[crosby-moe]

Improves the look of occlusion culling with transparent pixels by considering almost-solid pixels as solid, and almost-invisible pixels as invisible

Before:

After:

[what-the-diff]

PR Summary

• Introduction of New Parameter
  A new constant named SOLID_THRESHOLD has been introduced with a set value of 230. It will serve as a standardized reference in our following changes.

• Update in Presence Check
  The isPresent method has been improved. Now, it verifies whether the transparency level of a certain element is beyond a particular threshold (255 minus the SOLID_THRESHOLD), thus, improving the way we determine the presence of an element.

• Enhancement in Solidity Determination
  The isSolid method now measures solidity by checking if the transparency level of an element is above our set SOLID_THRESHOLD. This update will aid in more accurately determining the solidity of an element.

[tr7zw]

I'm not sure. This is being used as a feature to prevent connections when having patterns like this:

turning into

[crosby-moe]

I'm not sure. This is being used as a feature to prevent connections when having patterns like this: turning into

From what I can see, this behaviour seems to already be broken using the latest release:

Vanilla

3d Skin Layers 1.8.1 without patch

3d Skin Layers 1.8.1 with patch

[tr7zw]

No, I mean you place a pixel with 1% transparency into the holes to prevent the mod from closing the corner. The patch would remove this possibility, so it will always look broken with nothing a player can do about that.