Thanks a lot.. i was almost there.. got stuck with the ["Material", "Value"] array.. which i didnt/dont understand…

You can load all you textures into one material, then using node Color Mix and Value switch between them like in this example. I used animation to switch betwen two textures, but you also can use API to change value of the Value node.
texture_switch.blend

Can you describe how the color mix is set with API? That would make my live a lot easier..

Thanks a lot..
setting the directory correct was enough… feel really stupid now

had a lot of fun already with your product,
reading forums,documentation.. and getting things working…
Coming from unity3d and three.js, i miss the obj.clone function to clone a complete EMPTY to a new name… but sofar the engine is much more robust and faster then unity, and better documented then threejs..

I have a problem getting the sdk visible in Blender…

i worked ok, until i upgraded to blender 2.78a, and downloaded the last blender_ce, 16_10…
of course, stubborn and stupid i didnt follow the instructions completely…

two questions:
1. i am confused about the scripts directory in user preferences:…since no directory is called 'sdk', should it map to the direcotry with the 'bin', 'lib' and 'locales' folder… ?
2. after restarting blender, i dont see the blend4web addin i my addon list,not even greyedout..so cant select it.. how does it refresh,

thanks in advance