DETERMINING THE LIGHTING EFFECT FOR A VIRTUALLY PLACED LUMINAIRE

A computer implemented method of determining a lighting effect of a luminaire when the luminaire would be placed in a space, on the basis of a two dimensional (2D) image of the space is disclosed. First, three dimensional (3D) perspective parameters are determined based on the 2D image (100), wherein the 3D perspective parameters are indicative of a 3D perspective of the space as imaged in the 2D image. Then, object information comprising information on a shape of a surface of at least one object placed in the space (102) is received. Subsequently, a representation of the shape is defined which matches the 3D perspective of the space based on the 3D perspective parameters (104). A detection of the representation of the shape in the 2D image (106) follows. From the detected representation of the shape and from the 3D perspective, surface position information indicative of the position of the surface of the at least one object in the space (108) is derived. Then, information on a position of the luminaire in the space (110) is received such that a representation of the luminaire that matches the 3D perspective at the received position (112), based on the 3D perspective parameters and the luminaire position and on the 2D image can be determined. Finally, the lighting effect is determined based on the 3D perspective parameters, the surface position information, the luminaire position and on the 2D image (114).