/**
* Indicates the transform matrix applied to this document.
*
* @return Transform matrix.
*/
protected Matrix getMatrix() {
// If the matrix has already been computed then just return the cached value.
if (this.matrix != null) return this.matrix;
Matrix m = Matrix.IDENTITY;
if (this.heading != null)
m = m.multiply(Matrix.fromRotationZ(Angle.POS360.subtract(this.heading)));
if (this.pitch != null) m = m.multiply(Matrix.fromRotationX(this.pitch));
if (this.roll != null) m = m.multiply(Matrix.fromRotationY(this.roll));
// Apply scaling factor to convert file units to meters.
double scale = this.getScale();
m = m.multiply(Matrix.fromScale(scale));
if (this.modelScale != null) m = m.multiply(Matrix.fromScale(this.modelScale));
this.matrix = m;
return m;
}
