All of the above. And more. You can use all of this stuff in combination, or in layer processing. I'll build a scene in P5 with andix's WorldZ and his creat backdrop, and import it into Vue for the final render and lighting. Or I'll build a scene/world in Vue or Bryce, and put it on Nerd's backdrop, the Cyclorama from Daz, or the free rDNA Cove in P5. Switching between software and world methods can give some very interesting effects sometimes. I'm even slowly building a complete texture set for WorldZ using Vue and Photopaint.