Lecture 13: Global Illumination & Path Tracing (84)
danny-yu
I'm a little confused about what Xrr represents here. Is it the sum of all the bounces of light, or just one bounce of light?
StephenYangjz
I think how the algorithm applies to our case is a valid question to ask: I think Xrr represents the total bounces of light, and each bounce is represented by X. Therefore, we do not have to calculate all bounces to arrive at an unbiased estimate.
crystal-zq-wang
If we didn't use Russian Roulette, is there a "default" N value we would stop the summation at, and how would that be determined?
ethanweber
Following up on this, what are typical values of prr to use in practice and is Russian Roulette used in most implementations of ray tracing (e.g.,, in Blender?)?
ashvindhawan
https://developer.blender.org/T52313
Speaking of blender, this is a pretty interesting thread about how Russian Roulette actually resulted in a slightly worse render
I'm a little confused about what Xrr represents here. Is it the sum of all the bounces of light, or just one bounce of light?
I think how the algorithm applies to our case is a valid question to ask: I think Xrr represents the total bounces of light, and each bounce is represented by X. Therefore, we do not have to calculate all bounces to arrive at an unbiased estimate.
If we didn't use Russian Roulette, is there a "default" N value we would stop the summation at, and how would that be determined?
Following up on this, what are typical values of prr to use in practice and is Russian Roulette used in most implementations of ray tracing (e.g.,, in Blender?)?
https://developer.blender.org/T52313 Speaking of blender, this is a pretty interesting thread about how Russian Roulette actually resulted in a slightly worse render