skyboxes are six images....front, back, left, right, up and down which should stitch seamlessly. Normally a 3d app uses a 90 degree FOV and 90 degree rotations for rendering of skyboxes. Bryce, if I remember correctly, uses an odd FOV and is something like 112.5, this may have changed since I last used it many years ago so you will have to check it out. Panorama renders are for use on sky spheres which GG doesn't support as yet. You could create a sphere model and texture this to use as an entity within your level.
The main reason I dropped Bryce even though it is an easy to use little bit of software was the render engine being a donkey and takes hours to render out anything decent, it is all the same a product which is fun to use if your new to it all.
Quote: "These are not free images but I don't mind the cost if only I were able to sell the skybox that I build. I can include the skybox in any games I make and sell but not as a stand alone"
You have essentially answered your own question here.
I am not sure of the licensing on your converted panorama images if you intend to sell them as skyboxes unless you heavily modify them.Even then it may be a difference of opinion on how much you do modify. If you simply convert from panorama to box then it may not be enough to justify it, usually these type of images could only be included in a game or rendered image if you intend to sell it on regardless of whether you paid for them or not. It is always better to create your own to be certain.
