The radar map derived its rotation from EulerAngles(Quaternion), whose decomposition
is AMBIGUOUS for a yawing mech: as yaw sweeps past +/-pi the quaternion double-cover
flips it onto the pitch=roll=pi branch, so euler.yaw REVERSES -- the whole radar
counter-rotates the wrong way past 180deg (user: 'flops every 180 degrees'). Switched
both radar sites (view-matrix build + blip delta rotation) to YawPitchRoll, which
applies yaw first and yields a clean continuous 360deg heading -- the SAME fix the
compass HeadingPointer already uses (btl4gaug.cpp:2185). A/B verified live (BT_RADAR_LOG,
spinning madcat): euler.yaw folds (-0.30 vs true -2.84 rad) while ypr.yaw tracks clean.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
