A Brisse transformation can be made as follows:
- Define a random point P on the circumcenter of a triangle ABC.
- Construct the incircle of triangle ABC.
- Construct the lines through P tangent to the incircle.
- Define the intersections of these tangent lines with the circumcircle.
- Construct the line through these instersections.
- This line is tangent to the incircle of ABC.
- Q, the touchpoint of the tangent with the incircle is called the Brisse transform of P.