Figure 3-8.
Fig.3-8 Left is Ring Hatch filling, Right is Optimized bidirectional hatch filling
Optimization Gong type hatch: similar with Gong, will jump in null
place. 3-9：
Optimization Gong type hatch: similar with Gong, will jump in null
place. As shown in Figure 3-9:
Optimized bow shaped filling: Be similar to bow shaped filling，It
will still skip to fill in the blank space of the object. As shown in Figure 3-9:
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