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This operator selects the BkSurface objects in the scene to allow for easy selection of the objects that you want to include in the final BkSurface.
Steps to follow:
Click on "Prepare BkSurface objects".
The BkSurface objects that are in the scene will be selected.
![](https://static.wixstatic.com/media/69d67b_73d11b5ed1004ac4b051fd0be36ca050~mv2.gif/v1/fill/w_980,h_551,al_c,usm_0.66_1.00_0.01,pstr/69d67b_73d11b5ed1004ac4b051fd0be36ca050~mv2.gif)