Callback Functions

[Icare]

Hi ,

 

Who can explain to me the usefulness of the callback function on the materials.

 

What is that and how they are used?

 

Thank a lot

 

Nicolas

[Canardia]

They are probably good for physics audio. So when a body collides or sweeps over another body, the material callback would determine which sound to play. For example metal against wood, metal against sand, wood against glass, wood against rock, etc...

Every game has that.

[Masterxilo]

The material callbacks are called every time a material is set for rendering. You could update some uniforms of the shader the material uses within that callback. Or change some textures (for animated materials).

[Icare]

ok, thank

 

But how I do in blitzmax to retrieve the function pointer ?

 

Nicolas

[cocopino]

In Blitzmax you use Byte Ptr, something like:

 

SetEntityCallback (mesh, Byte Ptr(myCallBackFunction), ENTITYCALLBACK_COLLISION )

Function myCallBackFunction( ent:TEntity )
   'do stuff here with ent
End Function

[Icare]

thank a lot.

 

Nicolas