I'm trying to render a transparent glass cube that distorts the objects behind it (with the Blender Renderer). The glass object is basically a very thin cube. I have tried to apply the Raytrace effect to the material like this: But when I render, I obtain this result: I would like that the red cube behind this glass and the floor are a bit distorted. I tried to modify the index of refraction but didn't work. Is there a way to achieve what I am looking for in Blender Render?