A quick race.

Furthermore I have updated my old example RoadRace from the addon

Addon to create special / extended geometries - #5 by hofk

to a new state. THREEg.js/examples at master · hofk/THREEg.js · GitHub

See also

Struggling with paths

BeginnerExample // … step 15: matrix, move along room curve

**Added** a version with **quaternions**.

uses

```
THREE.Quaternion.prototype.setFromBasis = function( e1, e2, e3 ) {
const m11 = e1.x, m12 = e1.y, m13 = e1.z,
m21 = e2.x, m22 = e2.y, m23 = e2.z,
m31 = e3.x, m32 = e3.y, m33 = e3.z,
trace = m11 + m22 + m33;
if ( trace > 0 ) {
const s = 0.5 / Math.sqrt( trace + 1.0 );
this._w = 0.25 / s;
this._x = -( m32 - m23 ) * s;
this._y = -( m13 - m31 ) * s;
this._z = -( m21 - m12 ) * s;
} else if ( m11 > m22 && m11 > m33 ) {
const s = 2.0 * Math.sqrt( 1.0 + m11 - m22 - m33 );
this._w = ( m32 - m23 ) / s;
this._x = -0.25 * s;
this._y = -( m12 + m21 ) / s;
this._z = -( m13 + m31 ) / s;
} else if ( m22 > m33 ) {
const s = 2.0 * Math.sqrt( 1.0 + m22 - m11 - m33 );
this._w = ( m13 - m31 ) / s;
this._x = -( m12 + m21 ) / s;
this._y = -0.25 * s;
this._z = -( m23 + m32 ) / s;
} else {
const s = 2.0 * Math.sqrt( 1.0 + m33 - m11 - m22 );
this._w = ( m21 - m12 ) / s;
this._x = -( m13 + m31 ) / s;
this._y = -( m23 + m32 ) / s;
this._z = -0.25 * s;
}
this._onChangeCallback();
return this;
}
```