You might not like the answer but :
I asked it on the crystalspace channel , the only way you have to actualy use a shader would be to have the cvs version of crystalspace ( this will allow you to use shaders ) , this mean that you have to compile it yourself( if you never done this before i sugest you to install linux in my mind it s more easy than try to learn how to use MSVC) , or bug the PS team in order they release the GFX pack : viewmesh( view a mesh) + walktest( walk in a level ) + partedit ( edit particles) + exporters. Then Tweak the files you got after exporting this mean that you have to inderstand the CS file format a bit ( in fact it s not that complex ) , when tweaking the file , you have to tell which shader you are gonna use , then in the material section , tell the material to use this shader (look at /data/terrain/world when you download CS for an exemple , Some already made shaders are in /data/shaders , you may open those files with a simple text editor to have a look) , making your own shader require knowledge in programation.
For previewing a shader i would apply it to a simple cube , then load the cube in viewmesh.
Here is the short chat i had about it on #crystalspace
i had a question about using shaders on meshes , and i have to admit than i ahve striclty no idee how to use them , is there any guide or is it just too mutch complex ?
orogor: you have to assign a shader to a material.
orogor: there are some examples in CS.
orogor: data/r3dtest/world, data/particles/world, ...
but like can i have a preview of the shaders , also how to make them , or is there a way to pick already made ones ?
orogor: you can put a shader in an xml file (see data/shaders for examples) and reuse that.
Also note than this should be considered as experimental, it is suposed to work , there is work exemples who use them, but i didn t tried it myself , i dont think that the PS team tried it either ( i might be wrong ), also using shaders mean generaly not good framerate or small maps.
You can have a look at /data/shaders/cg_vertexlight.xml for using NV shaders in CS , this shader should help you to import those shaders http://www.cgshaders.org/shaders/ if the card is nvida based and with some luck other cards .
