this is slightly mis-led, but it is true that 3d conversion sometimes doesnt go as well (and often happens at the last few weeks of production, done by the some

this is slightly mis-led, but it is true that 3d conversion sometimes doesnt go as well (and often happens at the last few weeks of production, done by the some of the lowest paid people in the industry) so there are different levels of "made up". the VFX companies spend months to make the shots look perfect, and then the 3d conversion company rotoscopes some elements creates close enough 3d geometry to project it onto, shifts it in either direction (sometimes both, to try and maintain the original perspective) and finally re-paints or smartly clone-tools the missing elements that were previously behind other elements. it's honestly surprising it's done as well as it is considering this has to be done once the movie is absolutely finalized and before it goes to the theater.