Rendering Layered Materials with Diffuse Interfaces

In this work, we introduce a novel method to render, in real-time, Lambertian surfaces with rough dieletric coating. We show that the appearance of such configurations is faithfully represented two microfacet lobes accounting for direct and indirect interactions respectively. numerically fit these based on first order directional statistics (energy, mean variance) light transport using 5D tables narrow them down 2D + 1D analytical forms dimension reduction. demonstrate quality our by efficiently rendering plastics ceramics, closely matching ground truth. addition, improve state-of-the-art layered material model include interfaces.