Computer-implemented method for providing a configuration information for a laser guidance system for a medical intervention, the method comprising: - Receiving laser projection data regarding a laser projection geometry of the laser guidance system, - Receiving 3D model data regarding a surface, the surface being located within an effective range of the laser guidance system, - Calculating shadowing data regarding a shadowing effect of the surface on the laser projection geometry based on the laser projection data and the 3D model data, - Selecting the configuration information based on the shadowing data, the configuration information being indicative of a configuration of the laser guidance system for visualizing a planned path of an instrument for the medical intervention, - Providing the configuration information, - the laser projection geometry comprising a plurality of candidate fan-beam pairs, each candidate fan-beam pair of the plurality of candidate fan-beam pairs comprising two candidate fan beams of the laser guidance system intersecting each other, - the shadowing data comprising, for each candidate fan-beam pair of the plurality of candidate fan-beam pairs, a respective pair-specific shadowing information indicative of a shadowing effect of the surface on that candidate fan-beam pair, - wherein a selection from the plurality of candidate fan-beam pairs is made based on the shadowing data, thereby obtaining a selected fan-beam pair, - wherein the configuration information relates to the selected fan-beam pair for visualizing the planned path of the instrument for the medical intervention, - characterised in that intersection angle data are received, the intersection angle data comprising, for each candidate fan-beam pair of a subset of the plurality of candidate fan-beam pairs, an intersection angle information regarding an intersection angle of the two candidate fan beams of that candidate fan-beam pair, - wherein the selection from the plurality of candidate fan-beam pairs is made further based on the intersection angle data. - Receiving laser projection data regarding a laser projection geometry of the laser guidance system, - Receiving 3D model data regarding a surface, the surface being located within an effective range of the laser guidance system, - Calculating shadowing data regarding a shadowing effect of the surface on the laser projection geometry based on the laser projection data and the 3D model data, - Selecting the configuration information based on the shadowing data, the configuration information being indicative of a configuration of the laser guidance system for visualizing a planned path of an instrument for the medical intervention, - Providing the configuration information, - the laser projection geometry comprising a plurality of candidate fan-beam pairs, each candidate fan-beam pair of the plurality of candidate fan-beam pairs comprising two candidate fan beams of the laser guidance system intersecting each other, - the shadowing data comprising, for each candidate fan-beam pair of the plurality of candidate fan-beam pairs, a respective pair-specific shadowing information indicative of a shadowing effect of the surface on that candidate fan-beam pair, - wherein a selection from the plurality of candidate fan-beam pairs is made based on the shadowing data, thereby obtaining a selected fan-beam pair, - wherein the configuration information relates to the selected fan-beam pair for visualizing the planned path of the instrument for the medical intervention, - characterised in that intersection angle data are received, the intersection angle data comprising, for each candidate fan-beam pair of a subset of the plurality of candidate fan-beam pairs, an intersection angle information regarding an intersection angle of the two candidate fan beams of that candidate fan-beam pair, - wherein the selection from the plurality of candidate fan-beam pairs is made further based on the intersection angle data.