Gems rendering

Yesbird

Greetings !

This is my first post here, so I want to say thanks for supporting this forum and hope for community assistance.

I want to introduce my gems rendering application, containing 2265 different gems design and rendering parameters selection: https://gemview.yesbird.online/ . You can download designs in OBJ or POV-Ray formats and use it free for your projects.

All designs accrued from  this great resource, and using by professional gemcutters at author's permission: https://www.facetdiagrams.org/ .

Any kind of criticism is appreciated.

Eric Chadwick

Hey, this is nice, thanks for sharing! 

Can you talk a bit about your rendering process? How are you rendering the internal refractions in real-time?

I am in weekly calls with The Khronos Group, and a recent topic was gemstone rendering for e-commerce, using glTF models. It would be helpful to use some of these models to figure out a standard for webGL rendering of gemstones. One idea someone had was to include a custom IBL with the gemstone model which would be used for refractions, with high contrast patterns in the IBL. But I think real self-refraction is better, if possible. Another idea was to add bright specular reflections plus a bloom postprocess screen-space effect.

Yesbird

Thanks for kind words, I am glad to find like-minded people here as gemstones rendering is my passion.

I am using Three.js and a customized shader with an environment map, based on these sources:
https://github.com/N8python/diamonds.

You may also look at MeshRefractionMaterial in Drei:

https://codesandbox.io/p/sandbox/diamond-refraction-zqrreo

Although I believe that the IBL approach will work, I agree that real self-refraction is better, as in this case we will be closer to physically-based rendering, although more accurate results can be achieved only with ray-tracing and better with spectral splitting, as I did here: https://github.com/syanenko/povgems.

Reflections plus a bloom post process, I guess, will work less accurately and is insufficient for such demanding objects like gems. In any case it's not possible to predict results without a code - there is a lot of space for interesting experiments here.

If you will provide more information about your discussions with Khronos Group and project requirements I will be happy to be involved and possibly make some contribution.

Eric Chadwick

This is an example of the kind of rendering that was mentioned. A couple members talked about potential clients asking for similar rendering for their 3d assets.
https://showcase.webgi.xyz/?m=jewellery~collibri_ring 

Yesbird

Clear, these guys already have a similar service:  https://www.ijewel3d.com/products/ijewel-sdk
and it's possible to make something like one, having enought motivation.
It can look like my ceramic glazes viewer: https://glazeview.yesbird.online/botz.html 

In addition to real time rendering it's possible to do server-side ray tracing with much better quality, but it will take hardware resources:

https://povlab.yesbird.online/?scene=gem_2.pov

https://povlab.yesbird.online/?scene=gem_3.pov

What is your idea about this project ? Should it be the service, library, shader(s) or what ?