Abstract: In order to obtain the 3D visual effect of naked eyes,the tomographic algorithm is used to convert the object projection map into the attenuation map,and then the method of multi-layer display attenuation diagram is realized.Firstly,the scenes of the model are captured by virtual cameras from different angles of view in 3DSMAX software at equal intervals.Then for these projection views,the sparse matrix containing all ray paths is obtained by simple geometrical optics.And then through the least squares optimization method to fit the actual light field to get the corresponding attenuation diagram.Finally,through the multi-layer screen card into the three-tier screen device,observe the 3D renderings,the results are satisfied.