[osg-users] Shadow projected on the opposite side too

[Pierre-Jean Petitprez]

Hi Sebastian and Christian,
Thanks for your answers.

> This might have to do with wrong culling mode or geometry for the 
> shadowmap-generation. The culling mode should be front-face and your 
> geometry should be correct (e.g. if you do front-face culling you 
> should have some "inner" sides to contribute to depth.Can you tell us 
> what GPU you are on, and what geometry is showing this problem?

For the geometry, it's a simple osg::Box in my example, but it does the 
same with all models that I tried (.obj objects generally).
I am on Nvidia Quadro FX 580. I have no problems using culling modes and 
everything related to face culling works as expected, that's why I 
thought it was in the osgShadow implementation.

Cheers,


Le 28/04/2016 14:50, Sebastian Messerschmidt a écrit :
> Hi Pierre-Jean.
>
> This might have to do with wrong culling mode or geometry for the 
> shadowmap-generation. The culling mode should be front-face and your 
> geometry should be correct (e.g. if you do front-face culling you 
> should have some "inner" sides to contribute to depth.
> Can you tell us what GPU you are on, and what geometry is showing this 
> problem?
>
> Cheers
> Sebastian
>
>
>> Hi dear OSG users,
>>
>> I'm wondering how to correctly use osgShadow. As you can see on the 
>> file I have attached, the shadow map is projected on the receiving 
>> object also on a face which should normaly not receive the shadow 
>> from the sphere (on my example the light is at the top right corner). 
>> It behaves like if the top face did not stop the light to continue 
>> its path through the object (which is not transparent).
>> My example is with soft shadow but I tested with other techniques and 
>> it is the same behaviour.
>>
>> Is there a way to avoid such behaviour with osgShadow ?
>> Thank you.
>>
>> Cheers,
>> Pierre-Jean
>>
>>
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>
>
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