LuxCoreRender Forums

hi

I have worked over gold ,but diamonds don't look much brighter, how can i increase brightness only for diamonds in my scene .
cant add more lights it brightens whole scene.

If you want brighter diamonds you should try to darken all other materials in the scene (gold and ground) and then increase overall brightness via tone mapper.

I like to use low or medium contrast HDR lighting for gemstones.
https://hdrihaven.com/hdris/category/?c ... &o=popular

That's what I did:

• added volumes for world and diamond
• disabled camera volume
• switched engine to bidir and sampler to Metropolis
• set color profile to filmic
• mixed with denoised image 50/50
• maybe I forgot something

Diamond is translucent, so it will not be bright unless it's reflecting some light right into the eye or is rough or dirty. I guess everyone wants their diamonds be polished and clean, so it should send rays to the eye.

That one is not denoised (probably) different lighting:

Here's a modified version with darker materials and larger aperture:

When I try to render this with caustics, I see a huge difference between BiDir and Hybrid ^ Bidir
v Hybrid (diamond=only glass node and gold = only metal node)

If the diamond is gray, it means that the environment is gray (which is reflected).
Place some large area lights behind the camera so they can reflect in the diamond.

It's probably also important to have an accurately modelled "working" diamond shape (they are optimized to reflect as much light back as possible) and correct IOR (see our IOR node), otherwise total internal reflection might kill some of the highlights.

lighted with hdri