For my application (architecture visualization) it would be very useful to have the option to export a selection from a mesh. I know you can do this approximately by filtering the environment away so you make a new component. But I need t have the original model with a hole of the selected area, whereby the hole and the separated area fit exactly. Now, I can only do this approximately as I have to make the same selection again in the full model to filter out the selected area to get the hole. You can see the result of this in my video tutorial, at 16:05, you also see that this workflow does not lead to the best results.
Of course, exporting the selection of a mesh means that you will get the large texture of the whole model, which is a lot of wasted texture space. But in my modeling/visualization software, I can make sure that the same texture is used for the whole model and for the selected export.
An alternative solution would be to preserve a selection, so you can use exactly the same selection for both the smaller part (with an Invert Selection) and for creating the hole in the original model. That would be even better, as in that case, you can re-texture the smaller part, and still have it fit exactly in the hole.
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