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Am 05.04.2016 um 14:50 schrieb And:
> "And" <49341109@ntnu.edu.tw> wrote:
>> clipka <ano### [at] anonymous org> wrote:
>>> Am 31.03.2016 um 19:27 schrieb clipka:
>>>
>>>
>>> - My implementation of the Oren-Nayar model turns out to be bugged.
>>>
>>
>> I like the feature, could I help test it? I have read this model on wikipedia
>> and thought about it for a while.
>
> I just tried your new texture. The bigger the sigma the surface appears darker
> when applying the same diffuse value. It is from the Oren-Nayar model itself I
> have confirmed.
>
> Is this the bug you said?
No; since it's an intrinsic property of the model, I don't consider it a
bug.
What I got wrong is the dependence on "sideways" illumination, if you
know what I mean.
In the model there's a term depending on the angle between the light
source and eye directions /projected/ onto the surface (the azimuth
angle, if you like). Normally I should compute the projected vectors,
normalize them, and compute the dot product, to get the cosine of the
angle. But I forgot the normalization step.
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