Method roll

src/webgl/p5.Camera.js:672–691

* Rotates the camera in a clockwise/counter-clockwise direction. * * Rolling rotates the camera without changing its orientation. The rotation * happens in the camera’s "local" space. * * The parameter, `angle`, is the angle the camera should rotate. Passing a * positive angle, as

(amount)

   * camera view rotates in counter clockwise direction with vertically stacked boxes in front of it.
   */
  roll(amount) {
    const local = this._getLocalAxes();
    const axisQuaternion = Quat.fromAxisAngle(
      this._renderer._pInst._toRadians(amount),
      local.z[0], local.z[1], local.z[2]);
    // const upQuat = new p5.Quat(0, this.upX, this.upY, this.upZ);
    const newUpVector = axisQuaternion.rotateVector(
      new Vector(this.upX, this.upY, this.upZ));
    this.camera(
      this.eyeX,
      this.eyeY,
      this.eyeZ,
      this.centerX,
      this.centerY,
      this.centerZ,
      newUpVector.x,
      newUpVector.y,
      newUpVector.z
    );
  }

  /**
   * Rotates the camera left and right.