On 12/25/23 09:51, Bald Eagle wrote:
> In playing around with ray diagrams, it occurred to me that we have no inc-file
> or inbuilt reflected ray macro or function (that I know of).
> 
> Since we have trace () that also supplies a surface normal, a nice complement to
> that would be reflected_ray (Ray, SurfaceNormal).
> 

(or refracted, transmitted, media generated...)

I agree such capability would be useful(a) for diagrams - and probably 
mostly for debugging.

Assuming you want access to the real internally generated >first rays, 
the other forms are quite a bit harder / uglier to do than is trace(). 
Further, the results for other than initial / first rays are also 
tangled in render settings and options.

Bill P.

(a) - While doing the solver work back in 2017 /2018, I a couple times 
hacked in a capability to dump all the generated rays from single 
rendered pixels. The pixels were isolated by start/end column row 
command line flags (or ini settings). FWIW - It was hacked code and not 
SDL available functionality.

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