Since laser dot scanning only gives reliable information about the fibre orientation in the plane of board surfaces, simple assumptions are usually made to define the inner fibre orientation to model timber boards. Those models would be improved by better insight into real fibre deviation around knots. The present data is extracted from the laboratory method developed to evaluate growth layers geometries and fibre orientation, through successive planing, colour and laser dot scanning. The method is applied to a Douglas fir timber specimen. The proposed method provides data on fibre orientation in 3D with an accuracy that is relevant for the calibration of detailed models, more simply and feasibly than previously proposed methods.