Typo and off-by-one error in stratifying/jittering section of Book 3

[TheRayTracer]

I have noticed a small typo in the stratifying section of Book 3 of the dev-major v4 branch. The typo is in listing 6.

int sqrt_spp = int(sqrt(samples_per_pixrel));

Also, in listing 6, I believe there is an off-by-one error. This has existed since v3 of Book 3 and the accompanying reference source code.

auto u = (i + (s_i + random_double()) / sqrt_spp) / (image_width-1);
auto v = (j + (s_j + random_double()) / sqrt_spp) / (image_height-1);

Should be:

auto u = (i + (s_i + random_double()) / sqrt_spp) / (image_width);
auto v = (j + (s_j + random_double()) / sqrt_spp) / (image_height);

And also in the final scene.h source code.

[trevordblack]

Thanks. I'll look into it.

[trevordblack]

This is a sibling issue to #682

[hollasch]

Yes, this is being addressed in issue #682.

[hollasch]

Fixed the typo in ongoing changes for #682.

[trevordblack]

samples_per_pixrel still needs to be addressed

[hollasch]

I've fixed it in the feature branch (not yet on GitHub).

[hollasch]

Ref #993

[hollasch]

Two issues here. One is fixed, and the other is addressed in #682. Closing.