[Bf-committers] Re: [Bf-blender-cvs] CVS commit: blender/source/blender/render/intern/source

[Ton Roosendaal]

Hi,

In the meantime, I have rewritten most of the rendering stuff for  
tracing... the summation of reflected light appeared to be incorrect  
(specularity fading out too fast, specularity not suppressing  
reflection, etc). I also did a test with gamma-corrected summation,  
which looks much better as well. Light (energy) cannot be simply added  
when you use RGB and view it on a monitor. For example the difference  
between color 0.1 and 0.2 is much less apparant than difference between  
0.5 and 0.6. Of course you can correct this with setting your monitor  
brightness (gamma) at 2.5, but that will 'wash out' color a lot. Gamma  
of 1.3-1.7 is much more common for displays (also for TV).

This is true for anti-aliasing as well. And that's what the 'gamma'  
button in Blender is for. Gamma corrected antialiasing looks much  
better on regular displays.

-Ton-


On Saturday, Dec 13, 2003, at 21:10 Europe/Amsterdam, Fabrizio wrote:

> Hi Alex,
>
> It does look odd to me too but thinking about it could actually be  
> possible.
> What you are seeing is a reflection of the 'real' sphere in the  
> reflected
> surface of the centre object - ie reflecting of real sphere in mirror  
> in
> reflection! (though it shouldn't be so strong - but placement is  
> correct)
>
> I tried downloading your blend but it keeps timeing out half way  
> through for
> some reason so cannot try this myself:
>
> Delete your wood and double your centre object just below itself (ie  
> fake
> reflecting it if the wood were still there) and re-render. In the  
> bottom
> center object you should see the 'that' part of the sphere.
>
> It might be so strong because at that angle there might be a specular  
> hot
> spot on the sphere!
>
> What do you think?
>
> Regards
> Fabrizio
>
> ps. time for another Blender vs Yafray test Poll (the one with the  
> chess
> pieces) ;oP
>
>
>
>
>
>> Hi Ton,
>>
>> thanks for fixing this, reflections themselves look better now,
>> but don't you think that some other reflections in this scene
>> look pretty odd?
>>
>> http://loom.intrr.org/~intrr/prettyodd.jpg
>> http://loom.intrr.org/~intrr/prettyodd.blend
>>
>> Where does the strong reflection of the sphere in the center object's
> wood-
>> reflection come from?
>>
>>
>> | alexander ewering               instinctive new media
>> | ae[@]instinctive[.]de   http://www[.]instinctive[.]de
>>
>
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>
------------------------------------------------------------------------ 
--
Ton Roosendaal  Blender Foundation ton@blender.org  
http://www.blender.org