Op 03/02/2020 om 19:24 schreef Bald Eagle:
> 
> 
> "Francescodario Cuzzocrea" <fra### [at] mailpolimiit> wrote:
> 
>> Specifically, I'm using POVRay to generate images of a spacecraft in random
>> position into a generic orbit, which subsequently I'll analyze with different
>> computer vision algorithms to try to recognize the spacecraft into the scene.
> 
> Sounds very cool - what computer vision algorithms are you using?
> And welcome to the forum.  :)
> 
>> Here two pictures of the problem :
>>   - https://gitlab.com/bosconovic/spacacecraft-pov/blob/master/tango_102.png
>>   - https://gitlab.com/bosconovic/spacacecraft-pov/blob/master/tango_30.png
>>
>> In the first one almost half of the spacecraft is cutted, in the second on the
>> left a piece of the solar panel is cutted.
>>
>> Can anyone help me out to understand what I'm doing wrong ?
> 
> Without seeing the code for your scene --- it could be almost anything.
> 
> With that said, if I had to simply guess, I'd say that maybe what you're seeing
> is a hard shadow from something, if you have other objects in your scene.
> Adding finish {diffuse 0.5} and maybe adding a white sky_sphere to your scene
> would help you determine if you're just not reflecting any light from occluded
> surfaces.
> 
> 
> - Bill
> 

I tested the scene a bit (not extensively, alas) and I also guess that 
there is a hard shadow, possibly Earth? In tango_102 you translate your 
light_source quite a bit along the x-axis! Does it get partly /behind/ 
the Earth?

-- 
Thomas

Post a reply to this message