A work-in-progress attempt at improving Box Projected Reflections.
The issue with how box projected reflections are typically done is that when sampled, the roughness of the reflection is consistent regardless of camera position, and object position.
With that there are a couple of implementations here that attempt to alleviate that problem and make them more true to life and higher fidelity.
This is done by modifying unity's existing box projection method to output a hit distance from the bounds of the box, to where the object is. Using the hit distance it offsets the mip level to be sharper when closer to the bounds of the probe, and rougher when farther from the bounds. It's very cheap and fast, though not accurate as it fails to model anisotropic reflections.
This is a more accurate way of handling reflections. Using multiple randomized samples, and GGX to model roughness. It's also expensive at high sample counts. (more work to be done here)
Classic box projection, it's fast but has sharp edges and can look jarring especially when the cubemap is sampled at a higher mip level.
Using a beveled box projection with an adjustable bevel factor. Idea is to smooth out the sharp edges you'd get with the classic method. Has artifacts at high bevel values.
- Use Blue Noise for better perceptual quality.
- Use mips to reduce samples/noise.
- Animated noise.
- Quad Intrinsics?
- Use reflection cubemap luminance for better ray allocation?
No Contact Hardening
Approximated Contact Hardening
Traced Contact Hardening
Normal Maps with No Contact Hardening
Normal Maps with Approximated Contact Hardening
Normal Maps with Traced Contact Hardening
No Contact Hardening
Approximated Contact Hardening
Traced Contact Hardening
