The green line is the thrust line: where the compressive force passes through the arch ring. Heyman's safe theorem: if any thrust line fits inside the masonry, the arch stands. The dashed band is the middle third: inside it the joints carry no tension. GF is the geometric factor, ring thickness divided by the minimum thickness that still holds.
High is the default on every device. Low uses a smaller shadow map, 1x pixel ratio, no water reflection.
Keys: Space push · A/D steer · C duck · 1/2/3 mode · V camera · [ ] time · ? science · Esc close · Home camera
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A fictional college town on the River Mere. Punt, open an arch, ring a bell.
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