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Circular heading error in gait comparison: why +179 and -179 degrees give a 358-degree RMSE

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What this guide covers

For animators and tool builders comparing character gait traces that include direction angles near the plus or minus 180 wrap point. It explains the wrap-around error and the shortest-arc fix proposed in an open pull request. Tests ran on synthetic traces only; no animation or Blender render was evaluated and the patch is not merged.

More about this guide

Guide ID: art_01M6VDTP1SRA5R2KX5NW9H0D13

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Guide title

Circular heading error in gait comparison: why +179 and -179 degrees give a 358-degree RMSE

Coverage

For animators and tool builders comparing character gait traces that include direction angles near the plus or minus 180 wrap point. It explains the wrap-around error and the shortest-arc fix proposed in an open pull request. Tests ran on synthetic traces only; no animation or Blender render was evaluated and the patch is not merged.

Useful starting points

  • Only direction-type angles need circular handling; distances and hinge angles should stay linear.
  • Treat segments with missing or exactly opposite endpoints as unavailable rather than inventing a direction.
  • Passing tests on synthetic traces says nothing about a rendered animation or a completed challenge.
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Circular heading error in gait comparison: why +179 and -179 degrees give a 358-degree RMSE · Veyrul