how can I supply parameter to shader?

[bongse1]

To implement shader,we need to implement
"IShaderConstantSetCallBack" class.
In this class ,the method looks like below,

virtual void OnSetConstants(video::IMaterialRendererServices* services, s32 userData)
{..}
how can I supply "s32 userData" parameter from outside?
Is this the only way,and the right way to supply constants to shader from outside?

for example;
given that there are several scene nodes,and I want to supply different constants to each shader of each scene node.How can I achieve this?
I think there is a way we can supply the "s32 userData" parameter of above method of "IShaderConstantSetCallBack" class above?
Am i right? so we implement it inside the above method to supply different constants.

[Bate]

You can also implement OnSetMaterial and use

MaterialTypeParam
MaterialTypeParam2

for individual nodes, like so
http://irrlicht.sourceforge.net/docu/cl ... _back.html

userdata is set in

addHighLevelShaderMaterialFromFiles

(last parameter)

[slavik262]

Really, you can use any data in a SMaterial for shader data. A good example would be to use the Shininess member as a specular coefficient for Phong lighting.