private final double[] values;

public Matrix3(double[] values) {

this.values = values;

}

public Matrix3 multiply(Matrix3 other) {

double[] result = new double[9];

for (int row = 0; row < 3; row ++) {

for (int col = 0; col < 3; col++) {

for (int i = 0; i < 3; i++) {

result[row * 3 + col] +=

this.values[row * 3 + i] * other.values[i * 3 + col];

}

}

}

return new Matrix3(result);

}

public Vertex transform(Vertex in) {

return new Vertex(

in.x * values[0] + in.y * values[3] + in.z * values[6],

in.x * values[1] + in.y * values[4] + in.z * values[7],

in.x * values[2] + in.y * values[5] + in.z * values[8]

);

}