threejs Matrix3

threejs Matrix3

var matrix3_1 = new THREE.Matrix3();

var index1_new_x = t_matrix[0] * index1_x + t_matrix[3]*index1_y + t_matrix[6]*index1_z;
var index1_new_y = t_matrix[1] * index1_x + t_matrix[4]*index1_y + t_matrix[7]*index1_z;
var index1_new_z = t_matrix[2] * index1_x + t_matrix[5]*index1_y + t_matrix[8]*index1_z;
            

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