I read someone offhandedly mentioning this. Is it true? Could, say, a counter strike map get loaded up into Spark, and you just delete and retexture things that didn't get converted?
You can open .vmf files in the editor, but you can't save them (you get an error message that there is no .vmf exporter). Spark treats each side of a brush like its own face. This means that if you want to port a map to NS2 you have to redo all the geometry. Materials will also need to be ported and reapplied to each face. The scale for the levels seems about the same, so luckily you shouldn't need to resize anything. Also, this may just be me but when I try to open a bigger map I made in Hammer, Spark crashes.
In short, no. It's not useful to actually use as of now.
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In short, no. It's not useful to actually use as of now.