Tomographic vat photopolymerization for 3d printing of objects with internal property-variation

The present disclosure relates to a method for producing a multi-material three- dimensional object comprising: computing a number of projections describing the multi- material three-dimensional object to be formed from different orientation angles of said object, including: a number of first projections describing a first part of said object to be formed in a first material; a number of second projections describing a second part of said object to be formed in a second material; providing a build volume comprising: a first photosensitive component capable of polymerizing into the first material upon irradiation by light having a first wavelength; a second photosensitive component capable of polymerizing into the second material upon irradiation by light having a second wavelength, the second material having different mechanical properties than the first material; and irradiating the build volume with a number of patterns of light, as defined by the projections, at the respective corresponding orientations and wavelengths such that the light having the first wavelength deposits energy according to a first energy distribution and wherein the light having the second wavelength deposits energy according to a second energy distribution; thereby physically reproducing said multi-material three-dimensional object.