Import materials from files

scripting/lua/helpers.i

@@ -4,7 +4,7 @@
 function couch.TexturedMesh(meshfile, ...)
    local mesh = couch.Mesh.FromFile(meshfile)
    for i, texturefile in ipairs({...}) do
-      local material = couch.Material()
+      local material = mesh:GetMaterial(i - 1)
       material.usesTex = true
       material.tex = couch.Texture.FromFile(texturefile)
       mesh:SetMaterial(i - 1, material)