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ZPR - ZTL - heavy scene question and "failed to load" error message.

Hello ! i’ve seen on Google many peoples having this problem when they tried to open their ZPR scene : it simply failed to load, and at best they could a few of the Tools still there in the scene. they usualy get this message :

“Error has been encountered while trying to load a Tool. Loading has been aborted.”

so this is what happend to me. it happens if the scene gets higher than about 2,3 Go . i Wonder why Zbrush doesn’t simply say in the first place : “scen is too heavy, zbrush won’t save it since you won’t even be able to reopen it” … lol

several persons recommend to rather save the Ztools than saving the ZPR project. But i’d like to ask you the right way to proceed, since it’s not very convenient to have for example 20 ztools that form the whole scene, and have them all appart …

how are we supposed to work with heavy scènes ? what are the tricks ? i’d like to learn the proper way before going further and loose my work everytime.

are we supposed to save every Tools aside, then reimport them one by one when we need to work with all of them, every time ? what if the sum of all of them exceed 2,3 go ? the zpr will be useless of course since it won’t be able to open itself.
and what if a ztool exceed 2,3 go ?

thank you all