Re: [Flightgear-devel] OSG spotlights

[Markus Z. <gl...@gm...>]

Ok, I somehow got it to work:

added the following lines to /src/main/renderer.cxx (somewhere in the 
class SGPuDrawable block)

    stateSet->setMode(GL_LIGHTING, osg::StateAttribute::ON);
    stateSet->setMode(GL_LIGHT0, osg::StateAttribute::ON);
    stateSet->setMode(GL_LIGHT1, osg::StateAttribute::ON);
    stateSet->setMode(GL_LIGHT2, osg::StateAttribute::ON);
    stateSet->setMode(GL_LIGHT3, osg::StateAttribute::ON);
    stateSet->setMode(GL_LIGHT4, osg::StateAttribute::ON);

recompiled flightgear and changed the parameters in the lighting file to 
GL_LIGHT4 and light_num 4, and it works: I have ambient light and some 
sort of spotlight (wich I had to adjust a bit) now.
Not sure if it breaks anything, was just a quick shot ;-)

fly on,
markus

Markus Zojer wrote:
> Hi there!
>
> Maybe I missed something, but under OSG/opengl it should be able to 
> create up to 8 light sources.
>
> I used some simple osg code to generate a spotlight but it works only if 
> I define it as light_num 0, which corresponds the GL_LIGHT0 of opengl I 
> suppose, and this setting causes generic lightning to dissappear.
>
> Now some questions to someone with more insight into OSG:
> Is it possible to add lights when modifying the code below or is there a 
> current limitation in flightgear that prevent lights from being added?
> I had a quick look into renderer.cxx and it seems that our global 
> lighting is linked with osg there, but I am no programmer and I don't 
> know how our lighting system actually works.
>
> Here the code I used (when GL_LIGHT1 and light_num 1 were used,nothing 
> appeared):
>   LightSource {
>       UniqueID LightSource_2
>       DataVariance STATIC
>       nodeMask 0xffffff
>       cullingActive FALSE
>       StateSet {
>         DataVariance STATIC
>         rendering_hint DEFAULT_BIN
>         renderBinMode INHERIT
>         GL_LIGHTING ON
>         GL_LIGHT0 ON
>         GL_DEPTH_TEST ON
>       }
>       referenceFrame RELATIVE
>       Light {
>         UniqueID LightSource_3
>         DataVariance STATIC
>         light_num 0 //0 works but global light turned off
>         ambient 0.2 0.2 0.2 1
>         diffuse 1 1 1 1
>         specular 0 0 0 0
>         position 0 0 0 1
>         direction -1 0 0
>         constant_attenuation 1
>         linear_attenuation 0
>         quadratic_attenuation 0
>         spot_exponent 2
>         spot_cutoff 15
>       }
>       num_children 0
>     }
>
> fly on,
> markus
>
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