Some other improvements...
Added roughness parameter to the diffuse material.
Changed falloff shader to match the standalone one.
Fixed the portal material wich sets the wrong attribute so the material had no effect.
The distributed raytracing parameter of the info channel kernel is changed to the combobox "Sampling Mode"
Materal mix can have a displacement texture.
New polygon side shader included to render backface polygons if the shader is pluged into the opacity port of a material.
The displacement shader will have only a texture input, so you can use the new baking shader or an image shader as input.
Images can be changed at runtime with an external program and will update automaticly.
The alpha inputs of the gradient shader are gone and an issue with the position of the marker is fixed.