Method for making a three-dimensional object through a stereolithography process through a stereolithography machine of the type comprising: • a container for a fluid substance adapted for being solidified in layers through exposure to at least one predetermined radiation (RL, RL1, RL2); • at least one source (3, 31, 32) of said at least one predetermined radiation (RL, RL1, RL2); • an optical group configured to direct said at least one radiation (RL, RL1, RL2) towards a reference surface of said fluid substance arranged inside said container, said optical group comprising: ∘ a first optical sub-group configured to be exposed to said at least one radiation (RL, RL1, RL2) so as to instantaneously project the image of a first portion to be solidified corresponding to a portion of volume of said three-dimensional object onto said reference surface; ∘ a second optical sub-group configured to selectively convey said at least one radiation (RL, RL1, RL2) towards a point of said reference surface and to move said point so as to progressively expose a second portion to be solidified of said reference surface corresponding to a portion of volume of said three-dimensional object; • a control logic unit configured to control said optical group and/or said at least one radiation source (3, 31, 32) so as to expose at least one portion of said reference surface to said radiation (RL, RL1, RL2), wherein said control logic unit is configured to control said first optical sub-group and said second optical sub-group independently from one another; said three-dimensional object comprising a main body, which is the element that is actually intended to be produced, a support base and support elements defined between said support base and said main body, both of which will be separated from said main body at the end of said stereolithography process, said method comprising the following steps of: • laying a layer of said fluid substance in said container so as to define a reference surface; • exposing at least one portion of said reference surface to said at least one radiation (RL, RL1, RL2); • repeating said laying and said exposure for each subsequent layer of said three-dimensional object; characterised in that, for each layer, it provides for the exposure to said radiation (RL, RL1) of the portions to be solidified of said reference surface relative to said support base of said three-dimensional object exclusively through said first optical sub-group. • a container for a fluid substance adapted for being solidified in layers through exposure to at least one predetermined radiation (RL, RL1, RL2); • at least one source (3, 31, 32) of said at least one predetermined radiation (RL, RL1, RL2); • an optical group configured to direct said at least one radiation (RL, RL1, RL2) towards a reference surface of said fluid substance arranged inside said container, said optical group comprising: ∘ a first optical sub-group configured to be exposed to said at least one radiation (RL, RL1, RL2) so as to instantaneously project the image of a first portion to be solidified corresponding to a portion of volume of said three-dimensional object onto said reference surface; ∘ a second optical sub-group configured to selectively convey said at least one radiation (RL, RL1, RL2) towards a point of said reference surface and to move said point so as to progressively expose a second portion to be solidified of said reference surface corresponding to a portion of volume of said three-dimensional object; ∘ a first optical sub-group configured to be exposed to said at least one radiation (RL, RL1, RL2) so as to instantaneously project the image of a first portion to be solidified corresponding to a portion of volume of said three-dimensional object onto said reference surface; ∘ a second optical sub-group configured to selectively convey said at least one radiation (RL, RL1, RL2) towards a point of said reference surface and to move said point so as to progressively expose a second portion to be solidified of said reference surface corresponding to a portion of volume of said three-dimensional object; • a control logic unit configured to control said optical group and/or said at least one radiation source (3, 31, 32) so as to expose at least one portion of said reference surface to said radiation (RL, RL1, RL2), wherein said control logic unit is configured to control said first optical sub-group and said second optical sub-group independently from one another; • laying a layer of said fluid substance in said container so as to define a reference surface; • exposing at least one portion of said reference surface to said at least one radiation (RL, RL1, RL2); • repeating said laying and said exposure for each subsequent layer of said three-dimensional object;