Omnidirectional shadow texture mapping

摘要

An invention is provided for rendering using an omnidirectional light. A shadow cube texture map having six cube faces centered by a light source is generated. Each cube face comprises a shadow texture having depth data from a perspective of the light source. In addition, each cube face is associated with an axis of a three-dimensional coordinate system. For each object fragment rendered from the camera's perspective a light-to-surface vector is defined from the light source to the object fragment, and particular texels within particular cube faces are selected based on the light-to-surface vector. The texel values are tested against a depth value computed from the light to surface vector. The object fragment is textured as in light or shadow according to the outcome of the test.

主权项

1. A method for rendering pixels, comprising:
accessing, within an electronic system, a plurality of depth buffers corresponding to a light source, each depth buffer including depth data from a perspective of the light source; selecting a particular depth buffer from the plurality of depth buffers based on a location of an object fragment in relation to the light source, wherein the selecting is operable to be based on a perturbed surface of the object fragment, wherein the perturbed surface of the object fragment corresponds to a variation in a surface of a plane; and rendering a pixel corresponding to the object fragment utilizing the selected depth buffer, wherein the selected depth buffer is operable for use in shading the pixel.