Generating tool path data for an additive manufacturing apparatus comprises providing object design data in which at least a part of a physical object is represented by a line 302. A section 308a, 308b, 310a, 310b of the line 302 is then sliced using an intermediate slicing layer that is provided between first and second physical build layers 304 of the additive manufacturing apparatus. The slicing generates an intermediate layer point 316, 320 at the intersection of the section 308a, 308b, 310a, 310b of the line 302 and the intermediate slicing layer, with the intermediate layer point 316, 320 being located between the first and second physical build layers 304. The intermediate layer point 316, 320 is then projected to a projected build layer point 322, 324, 326 that lies within a physical build layer 304 of the additive manufacturing apparatus. The projected build layer point 322, 324, 326 is used to provide tool path data for that physical build layer 304. A similar process can be used in which the physical object is represented by a surface.
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