[osg-users] #pragmatic composition : setDefine

[Sebastian Messerschmidt]

Hi Nick,

> Hi Robert, all,
>
> I finally ported all my shaders to the this new thing. I have a 
> question. Probably simple but will go anyway
>
> in my shader I have something like
>
> #define MYDEFINE
> .. do stuff here ...
> #endif
>
> at the root of the scene I have
> stateSet->setDefine("MYDEFINE");
>
> how can I fornid this define somewhere down the tree ? Simple removing 
> it is not helping (as expected I guess).
Do you mean "unsetting"?
Then simply do setDefines("MYDEFINE", osg::StateAttribute::OFF) where 
you like it to have it disabled.
The rules for the overriding / protecting apply to this as well.

>
> Any sample how the defines with Values set works?
Simply by setDefine("MY_VALUE_DEFINE", "42", osg::StateAttribute::ON)

or Roberts example defining a function:

stateset->setDefine("VERTEX_FUNC(v)" , "vec4(v.x, v.y, v.z * 
sin(osg_SimulationTime), v.w)");

>
> Thanks a bunch !
>
> Nick
>
> -- 
> trajce nikolov nick
>
>
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