setDirection method
dynamic
setDirection(
- dynamic dir
Implementation
setDirection(dir) {
// dir is assumed to be normalized
if (dir.y > 0.99999) {
quaternion.set(0, 0, 0, 1);
} else if (dir.y < -0.99999) {
quaternion.set(1, 0, 0, 0);
} else {
_axis.set(dir.z, 0, -dir.x).normalize();
var radians = Math.acos(dir.y);
quaternion.setFromAxisAngle(_axis, radians);
}
}