Corners??

[Pigbuster]

This is a related question, I suppose. How are you able to make boundary lines on tiles and then make the parts of the block that aren't inside a group of lines dissapear? I know how to make a narrow rectangle in the boundary thing, but I don't know how to make the block show where the hole is.

[sniperGasMask]

When you drew the boundary lines and press 'A' its turning a dark color because the lines aren't clockwise, like Jonathan said, or they aren't connected fully

[Jonathan_NL]

I said it modifies red instead of alpha.

(I think Alex and Josiah can confirm this)

[SimpleLizard]

  This helped me alot. Your fourms are the best, chronic logic