/**
 * Matrix 3 Maths
 * @param row0 R3.API.Vector3
 * @param row1 R3.API.Vector3
 * @param row2 R3.API.Vector3
 * @constructor
 */
R3.Matrix3 = function(
    row0,
    row1,
    row2
) {
    this.identity();

    if (row0) {
        this.rows[0] = row0;
    }

    if (row1) {
        this.rows[1] = row1;
    }

    if (row2) {
        this.rows[2] = row2;
    }
};

/**
 * Set matrix to identity
 */
R3.Matrix3.prototype.identity = function () {
    this.rows = [
        new R3.API.Vector3(1, 0, 0),
        new R3.API.Vector3(0, 1, 0),
        new R3.API.Vector3(0, 0, 1)
    ];
};