I´m rendering a cara in Blender 2.71, Cycles. The windshield is a thin curved object with Glass shader that is generating a very strong distortion. The seats seem to be inside water… How can I control how strong I want this effect to be without afect the reflection? If I decrease the IOR to 1, for exemple, the distortion desapears, as well the reflections…
Your glass needs to have thickness, Cycles is thinking your entire interior is a solid block of glass. Either add a solidify modifier to your glass to give it some thickness, or use IOR=1.
J is right, but for thin glass like that where refraction does basically nothing to the final result, I’d recommend not using a glass shader at all. Mix a transparent shader with a glossy shader and work with that. It will save you tons of render time.