# inverse static method

double inverse(
1. Float32List matrix,
2. int offset
)

Compute the inverse of the 4x4 `matrix` starting at `offset`.

## Implementation

``````static double inverse(Float32List matrix, int offset) {
final a00 = matrix[0];
final a01 = matrix[1];
final a02 = matrix[2];
final a03 = matrix[3];
final a10 = matrix[4];
final a11 = matrix[5];
final a12 = matrix[6];
final a13 = matrix[7];
final a20 = matrix[8];
final a21 = matrix[9];
final a22 = matrix[10];
final a23 = matrix[11];
final a30 = matrix[12];
final a31 = matrix[13];
final a32 = matrix[14];
final a33 = matrix[15];
final b00 = a00 * a11 - a01 * a10;
final b01 = a00 * a12 - a02 * a10;
final b02 = a00 * a13 - a03 * a10;
final b03 = a01 * a12 - a02 * a11;
final b04 = a01 * a13 - a03 * a11;
final b05 = a02 * a13 - a03 * a12;
final b06 = a20 * a31 - a21 * a30;
final b07 = a20 * a32 - a22 * a30;
final b08 = a20 * a33 - a23 * a30;
final b09 = a21 * a32 - a22 * a31;
final b10 = a21 * a33 - a23 * a31;
final b11 = a22 * a33 - a23 * a32;
final det =
b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06;

if (det == 0.0) {
return det;
}

final invDet = 1.0 / det;

matrix[0] = (a11 * b11 - a12 * b10 + a13 * b09) * invDet;
matrix[1] = (-a01 * b11 + a02 * b10 - a03 * b09) * invDet;
matrix[2] = (a31 * b05 - a32 * b04 + a33 * b03) * invDet;
matrix[3] = (-a21 * b05 + a22 * b04 - a23 * b03) * invDet;
matrix[4] = (-a10 * b11 + a12 * b08 - a13 * b07) * invDet;
matrix[5] = (a00 * b11 - a02 * b08 + a03 * b07) * invDet;
matrix[6] = (-a30 * b05 + a32 * b02 - a33 * b01) * invDet;
matrix[7] = (a20 * b05 - a22 * b02 + a23 * b01) * invDet;
matrix[8] = (a10 * b10 - a11 * b08 + a13 * b06) * invDet;
matrix[9] = (-a00 * b10 + a01 * b08 - a03 * b06) * invDet;
matrix[10] = (a30 * b04 - a31 * b02 + a33 * b00) * invDet;
matrix[11] = (-a20 * b04 + a21 * b02 - a23 * b00) * invDet;
matrix[12] = (-a10 * b09 + a11 * b07 - a12 * b06) * invDet;
matrix[13] = (a00 * b09 - a01 * b07 + a02 * b06) * invDet;
matrix[14] = (-a30 * b03 + a31 * b01 - a32 * b00) * invDet;
matrix[15] = (a20 * b03 - a21 * b01 + a22 * b00) * invDet;

return det;
}``````