ompf2.com

Glossy is one thing and should be treated with care but I'm not sure bidirectional is more efficient otherwise. Would be interesting to see some statistics.

Or don't clamp:

Illumination in the Presence of Weak Singularities
with Alexander Keller
Monte Carlo and Quasi-Monte Carlo Methods 2004

But it of course depends on how you render your vpl, you may not have the option.

Ray marching is merely another kind of intersection method, usually used for different kinds of volumetric functions and data, for example distance field iso-surfaces, smoke etc.

My plan is to use global importance maps to seed a MCMC algorithm. That way I can use the efficiency of those importance maps and hopefully in most cases spread the energy of the high contribution paths (generated from paths with low probability), especially if I give them extra high importance.

PMC is nothing magically, I'd even argue that is nothing new, it's just importance sampling used in a certain way. There is no extra benefit. I've been experimenting a lot with different versions importance sampling, including PMC and I've learned one thing. You have to importance sample ALL the pea...

To account for implicit paths you also need to intersect with the lens geometry.

Can't you just turn it into two dimension by randomizing a common time and wavelength for each pass? I thought it was standard practice for sppm class of algorithms. I'm probably missing some important details....

What percentage of the inner loops use double precision? Can you give a rough estimate?

I would strongly suggest reprojecting pixels under rotation only. It will speed up convergence like crazy when used together with a helmet with lots of small head movements all the time. If you want to be tricky you can focus all the new pixels that comes into view. Will even give a smoother transla...

This is going to sound harsh but you removed (N*w) from brdf and made it non symmetric and made Em not measure radiance any more. For me there is no progress there. But it doesn't really matter. However, whatever works for you is ok, as long as you keep track of all the details. It will be harder to...