Here are some examples sceens for use in raytracer in the .scn format.
Ther first is a set of scenes which use only sphere’s: https://www.cs.unc.edu/Courses/comp575-f10/assignments/raytrace2/SphereExamples.zip
These should, for the most part, match the examples in the XML format.
Next, there is a set which also use triangles: https://www.cs.unc.edu/Courses/comp575-f10/assignments/raytrace2/Triangles.zip
Lastly, there is a set of more complex tests. This includes a dragon! https://www.cs.unc.edu/Courses/comp575-f10/assignments/raytrace2/Complex.zip
Warning: These will take a LONG time to render unless you get some sort of acceleration structure working!