default boolean insideCornerEdgeOpen(int r) {
        return tile().getSlottedPart(PartMap.edgeBetween(absoluteDir(this, r), getSide())) == null;
    }
If this is a wire, should return true if this wire is smaller
than that wire. This is used for corner rendering. (This wire renders
to that wire, not that wire to this wire). Always false if this is not a wire.
<p>
Only one of the parts (either this or that) must return true.

@param part The part to connect to
@return true if this should render instead of that
core/src/main/java/mrtjp/projectred/core/part/IConnectableFacePart.java