How can i make a Glass material that doesn't need any light to shine? I'm trying to make a PNG Rain animation with Alpha Channel and then i need to import that into another software, the thing is that i created a glass material in order to give the water-drops a kind of transparent texture, and it works on the preview of the material, the thing is that it needs light (any lamp) to work, but on this case i do not want to add any light since i need it almost as a plain illumination, is it possible to make the material work without light? like an Emission material but with this glass material?



Image Reference (without the background)
Set the background material to white or light grey in enviroment.
Turn on ambient inclusion in enviroment settings.
Set film to transparent in render settings.

That said, without a directional light you won't get shadows or reflection that make it look like rain.  So you might want to add a light, use an image or movie in the background that the rain could reflect, or set up a light that only throws shadows and place it directly above your rain.

Andrew price did a great tutorial that included rain on the camera, if you have any other issues you might want to check it out on blenderguru.com