spur_gear: fix negative helix angles #1530
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The helix code previously included an assumption that the angle is positive when calculating the slice count, which caused negative angles to always produce only 1 slice. This fix adds an abs() call around the twist to produce the same slice count for both directions.
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The helix code previously included an assumption that the angle is positive when calculating the slice count, which caused negative angles to always produce only 1 slice.
This fix adds an abs() call around the twist to produce the same slice count for both directions.