Function planeFromHeadingTilt

planeFromHeadingTilt(
    position: { height?: number; lat: number; lng: number },
    headingDeg: number,
    tiltDeg?: number,
): ClippingPlane
Build a ClippingPlane from a compass heading and tilt — the SliceWidget's backbone and a convenient way to author planes by hand.
Parameters
- position: { height?: number; lat: number; lng: number }
  A point the plane passes through (height metres above the rendered ground datum, default 0).
- headingDeg: number
  Compass direction of the normal's horizontal component, in degrees clockwise from north (0 = keep the north side, 90 = keep the east side).
- tiltDeg: number = 0
  Normal elevation above the horizon in degrees. 0 (default) gives a VERTICAL slicing plane; 90 points the normal straight up (a horizontal plane keeping everything above position); -90 keeps everything below.
Returns ClippingPlane
The equivalent geographic ClippingPlane.
Example
```
// Vertical plane through downtown, keeping the east side:
const plane = planeFromHeadingTilt({ lng: -71.06, lat: 42.36 }, 90, 0);
layer.setClippingPlanes({ planes: [plane] });
```