I am trying to render 3D images photo realistically, is this possible with threeJS or are there 3rd party libraries out there ?
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Actually yes, there is this pathtracing renderer that seems pretty advanced.
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I knew the first one, but the one posted by MrDoob seems better done, documented and user friendly.
I miss the ability to set the transparent materials refraction index and light absorption, though. And looking forward to see point lights implemented.
Just my point of view, but I see little value in a ray-tracing renderer. Path tracer is great, as it mimics the way light behaves in the real world, but a ray-traced image just looks fake. Expensive to compute and still fake. To me a ray-traced image belongs in the uncanny valley 
Great implementation though, not to dismiss the effort put into it. Also, I realize that there are applications for this, so this is just my opinion.
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Just noting that the second one is also path tracing. The project name is misleading.
About applications: Yes, I was thinking in rendering still images for CAD. Not there yet for RT.
Doesn’t really look like it, the cornel box is a really good example. Here’s what that project produces:
Here’s what path-traced cornel box looks like (excuse poor modelling skills):
You can see 2 immediate points: color bleeding, soft shadows.
The image produced by “ray-tracing-renderer” has very sharp shadows and minimal color bleeding. I don’t know if it’s a result of their scene setup though, you can setup some gnarly looking light rigs 
maybe result of biased sampling.
Yes, it seems the setup is the culprit. The gas mask is way darker than your diffuse sphere.
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thank you , this is super