zRotate method

dynamic zRotate(dynamic point, dynamic angle)

• Rotate camera around its direction axis passing by a given point by a given angle
  • @param {Vector3} point The point where the rotation axis is passing trough
    • @param {Number} angle Angle in radians
    • @returns The computed transormation matix

Implementation

zRotate(point, angle) {
  this._rotationMatrix.makeRotationAxis(this._rotationAxis, angle);
  this._translationMatrix.makeTranslation(-point.x, -point.y, -point.z);

  this._m4_1.makeTranslation(point.x, point.y, point.z);
  this._m4_1.multiply(this._rotationMatrix);
  this._m4_1.multiply(this._translationMatrix);

  this
      ._v3_1
      .setFromMatrixPosition(this._gizmoMatrixState)
      .sub(point); //vector from rotation center to gizmos position
  this
      ._v3_2
      .copy(this._v3_1)
      .applyAxisAngle(this._rotationAxis, angle); //apply rotation
  this._v3_2.sub(this._v3_1);

  this._m4_2.makeTranslation(this._v3_2.x, this._v3_2.y, this._v3_2.z);

  this.setTransformationMatrices(this._m4_1, this._m4_2);
  return _transformation;
}