[book 3][book1-review] Chapter 6 issues

[genmeblog]

I go through The Rest of Your Life in version 4.x

First two images from Chapter 2.3 "Stratified Samples (Jittering)" created from my code are identical as in the book. The next changes are in Chapter 6.

Chapter 6.1 changes two things: samples_per_pixel are set to 100 (changed from 64) and scattering_pdf is introduced (it doesn't matter in this chapter since scattering_pdf/pdf = 1. The Image 3 contains very low noise and from my experiments similar result can be achieved by setting samples_per_pixel to 1000 (not 100 as in the book).

Chapter 6.2 sets pdf to a constant, and again, Image 4 is far for the result I've got.

I know that images are going to be recreated - just wanted to emphasize it here.

Chapter 6.3 sets scattering_pdf to a constant, which with connection to a line from previous chapters (ie. double pdf = scattering_pdf;), again, gives ratio scattering_pdf/pdf=1. This degenerates to a hemisphere scattering from book1.

Is it correct?

[hollasch]

Will review.

[hollasch]

This is two issues mixed together. First is dupe of #1018. Second is described in more detail in #1302.