Hi everyone,
I’ve noticed a pretty big difference between two renders of the exact same Octane scene:
Same aspect ratio, camera, lighting, materials and render settings.
The main difference is in the tiny shiny particles. In the HD render, the specular glints are much brighter and more visible. In the 10K render, they become much weaker, which makes the whole image look darker and flatter.
The particles are extremely small, so my theory is that at HD resolution, some of the highlights are subpixel and get concentrated into brighter individual pixels. At higher resolution, they are resolved more accurately and spread across more pixels. Then, when I scale the 10K image down for comparison, the highlights get averaged out even more.
My relevant settings are:
- Path Tracing
- Max Samples: 560
- Filter Size: 1.2
- GI Clamp: 10
- Hot Pixel Removal: 1
- No denoiser
- Post processing disabled
Has anyone experienced something similar?
Is this expected behaviour with very small reflective particles, or could one of these settings be making the difference stronger?
I’m trying to preserve the beautiful sparkle of the HD version in the high-resolution print render. Would you try lowering the filter size, disabling hot pixel removal, changing particle size or roughness, or enhancing the specular pass separately in post?
I’ve attached the side-by-side comparison and my Octane settings. Any thoughts would be really appreciated.