: If your surfaces form a completely closed (water-tight) volume, you can use a "Knit" or "Sew" tool. In software like Siemens NX , sewing the sheets together and ensuring there are no gaps will allow the system to treat the volume as a solid.
: If you have a single surface or a set of joined surfaces, you can use a thicken command to add a uniform wall thickness. In SolidWorks , this converts the surface into a solid body by specifying the depth and direction. vmstudio_simona_solomon_larg_deschideti_poarta_...
If you are looking to "create a solid feature" based on this media—likely referring to a 3D modeling task where you convert surface geometry into a solid body—the process depends on your specific CAD software: Common Methods to Create Solid Features : If your surfaces form a completely closed
: You can use intersecting surfaces to define an internal region and then select the option to "Create internal regions" to generate a solid body from the enclosed space. In SolidWorks , this converts the surface into