1 research outputs found
Plausible and realtime rendering of scratched metal by deforming MDF of normal mapped anisotropic surface
An effective method to render realistic metallic surface in realtime application is proposed. The proposed method perturbs
the normal vectors on the metallic surface to represent small scratches. General approach to the normal vector perturbation
is to use bump map or normal map. However, the bumps generated with those methods do not show plausible reflectance
when the surface is modeled with a microfacet-based anisotropic BRDF. Because the microfacet-based anisotropic BRDFs
are generally employed in order to express metallic surface, the limitation of the simple normal mapping or other normal
vector perturbation techniques make it difficult to render realistic metallic object with various scratches. The proposed method
employs not only normal perturbation but also deformation of the microfacet distribution function (MDF) that determines the
reflectance properties on the surface. The MDF deformation enables more realistic rendering of metallic surface. The proposed
method can be easily implemented with GPU programs, and works well in realtime environments