Create a half arch with parameters clearSpanWidth=4; riseHeight=2; depth=3; topAbutmentHeight=0.5; pierWidth=0.5; pierHeight=1. Parameter clearSpanWidth measure refers to a full arc, consider clearSpanWidth/2 for the archHalf width. Modify them with Transform scale or by editing the IndexedFileSet node. See the reference file ArchModelingDiagrams.pdf and the ArchScript_more_readable.js script to find further information.

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