Blender: Material node for rain on a window

Recently I had tested some dull-reflection materials using texture bump. The image is a glass version of it.

The result is seemingly a window in rainy day, trickling droplet down. 
displace_roughness3_texture1_wood-crack1
Below is the material node of the window.

I used wooden bark texture for mapping roughness and normal on window plane.
The texture connects to the bump node. The bump node connects to Diffuse’s normal and Glossy’s normal.
The texture also connects to Glossy’s roughness through ColorRamp.

This normal and roughness is responsible for rain’s droplets and sweat on the window.
node_bump_glass_roughnessThis is the covert texture behind which I used in image texture node.
wood_crack2
As a decoration, I added glass sphere particle on the plane to be bigger rain drops. It’s like pimples so perhaps I should have made them more deformed shapes.
particle_droplet_window1

 

EDIT:

You can download the blend file from the Blend Swap page.

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