Irrlicht Engine

WHEN I CREATE OBJECT OF MY class MyShaderCallBack
in VS2005 i get an error"cannot instantied object becouse its abstract
due to following members OnSetShaderConstant ...(sory my english is bad)"

You can´t make new instances from abstract class. So you have to derive your own shader-class using ShaderCallBack-class. That means that you have to override all pure virtual functions from ShaderCallBack-class.

I think that message is trying to tell you that you haven´t overrided OnSetShaderConstant-method yet.

thanx for reply.i solved it by adding second parametar to
method OnSetShaderConstant even if that parametar is not used
(s32 userData).i m still learning c++.
for what then this parametar can be used, i'v like to se some example of
it.please anyone? thanx in advance.