code: public Matrix3f setSkewSymmetric(float a, float b, float c) {
          m00 = m11 = m22 = 0;
          m01 = -a;
          m02 = b;
          m10 = a;
          m12 = -c;
          m20 = -b;
          m21 = c;
          return this;
      }
docs: Set this matrix to a skew-symmetric matrix using the following layout:
  <pre>
  0,  a, -b
  -a,  0,  c
  b, -c,  0
  </pre>
  
  Reference: <a href="https://en.wikipedia.org/wiki/Skew-symmetric_matrix">https://en.wikipedia.org</a>
  
  @param a
  the value used for the matrix elements m01 and m10
  @param b
  the value used for the matrix elements m02 and m20
  @param c
  the value used for the matrix elements m12 and m21
  @return this