SHADING CG REPRESENTATIONS OF MATERIALS

摘要

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for shading computer graphics (CG) representations of materials. One of the methods includes obtaining data describing a physical material; receiving a shading request to shade a particular point in a CG representation of the physical material from a rendering engine, wherein the request identifies a mapping position of the particular point, a view direction at the mapping position, and a light direction at the mapping position; calculating a direct lighting color at the mapping position using a plurality of palettized images; calculating an indirect lighting color at the mapping position using the data describing the physical material; generating a final color at the mapping position by combining the direct lighting color and the indirect lighting color; and providing the final color to the rendering engine for use in rendering the CG representation of the physical material.

主权项

1. An apparatus comprising:
a light source having a lens for emitting light; a second mirror; a plurality of first planar mirrors, wherein the light source is movable to directly illuminate each first planar mirror of the plurality of first planar mirrors, and wherein, for each first planar mirror, directly illuminating the first planar mirror comprises emitting light from the lens of the light source that is reflected by the second mirror to intersect a reflective surface of the first planar mirror; a sample support configured to support a material sample, wherein the sample support is positioned such that each of the first planar mirrors reflects a respective view of the material sample from a different perspective; and a camera configured to capture a plurality of images of the plurality of first planar mirrors reflecting the material sample, each of the plurality of images being captured while the light source is positioned to directly illuminate a different first planar mirror of the first planar mirrors.