Hello 
i’ve working with three.js alot in my free time and also lately i’ve creating 3d models… but i am very new to tools like blender and such, so i’ve create my own online 3d viewer with capture image option, it supports only glb/gltf and fbx formats for now…
you can upload 3 models together but not more than this (just for right now…) you can adjust lights (PointLight,SpotLight) and background color.
hope one of you find this useful like i did
Capture3D