System and methods for tomographic vat photopolymerization

The invention regards an a method of fabricating a three-dimensional object by tomographic vat photopolymerization comprising computing a number of primary projections describing the three-dimensional object; and wherein the primary projections comprise positive and negative intensity values; deriving, from each primary projection, a positive and a negative projection, corresponding to the positive and negative intensity values respectively; providing a build volume (24) comprising: a monomer; a precursor of a stable radical scavenger inducible by light of a first wavelength and wherein said stable radical scavenger is sensitive to light of a second wavelength; and a photosensitive component capable of initiating polymerization of the monomer by light of the second wavelength; and irradiating the build volume at the respective corresponding orientations with light of the first wavelength in a first series of patterns of light; and light of the second wavelength in a second series of patterns of light.