While digging again into Mandelbulber, I have a few remarks concerning a few topics.

This one is about

**raytracing**.

**Depth of field**The photographer in me shivers ... how great it would be to have a line not just a point of focus. Having distance

`a` and

`b` ... anything from camera to a point with distance

`a` is calculated, the range from

`a` to

`b` is ignored, and anything beyond

`b` is calculated again.

(That is indeed one of the the three things that I am missing from MB3D)To overdo this idea ... I imagine to place a sphere in a scene and give it the attribute 'focal area'. That sphere is not rendered but defines an area of focus.

**Environment Mapping**I do not understand this option

With an image loaded, even setting Reflectance to values beyond 10, the render shows no effect.

But I think, this could be a place to load in an HDRI? If not, maybe this could be implemented.

**Monte Carlo algorithm**If you have some very much spare time ... An option like the DE-Optimization would be nice. An algorithm that scans a scene for max noise. The result shouldn't be a set of values, but small rendered tile with the given Max Noise level/Max numbers of samples. This way those values can be observed and adjusted without rendering in full resolution.

Thanks again for your time,

Voulxe

Linkback: https://fractalforums.org/mandelbulber/14/about-raytracing/3466/