fromQuat function
Calculates a 4x4 matrix from the given quaternion
@param {mat4} out mat4 receiving operation result @param {ReadonlyQuat} q Quaternion to create matrix from
@returns {mat4} out
Implementation
List<double> fromQuat(List<double> out, List<double> q) {
final x = q[0], y = q[1], z = q[2], w = q[3];
final x2 = x + x;
final y2 = y + y;
final z2 = z + z;
final xx = x * x2;
final yx = y * x2;
final yy = y * y2;
final zx = z * x2;
final zy = z * y2;
final zz = z * z2;
final wx = w * x2;
final wy = w * y2;
final wz = w * z2;
out[0] = 1 - yy - zz;
out[1] = yx + wz;
out[2] = zx - wy;
out[3] = 0;
out[4] = yx - wz;
out[5] = 1 - xx - zz;
out[6] = zy + wx;
out[7] = 0;
out[8] = zx + wy;
out[9] = zy - wx;
out[10] = 1 - xx - yy;
out[11] = 0;
out[12] = 0;
out[13] = 0;
out[14] = 0;
out[15] = 1;
return out;
}