LightSources

Usage

• LightSources is an option for Graphics3D and related functions that specifies the properties of point light sources for simulated illumination.

Notes

• The basic form is LightSources -> {

, ... }, where the

are the specifications for each light source.

• Each

has the form {direction, color}. The direction is specified as {x, y, z}, where the components are with respect to the final display area. The

and

are horizontal and vertical in the plane of the display;

is orthogonal to the display. Positive

is in front. Only the relative magnitude of the components is relevant; the overall normalization of the vector is ignored. The color can be specified by GrayLevel, Hue or RGBColor.

• Simulated illumination determines the shading of polygons in three-dimensional pictures.

• The shading of a particular surface element is computed as a sum of contributions from point light sources, plus a contribution from ambient light.

• Surface properties are specified by SurfaceColor directives.

• Light reflection properties assumed for surfaces are described in the notes for SurfaceColor.

• See Section 2.10.12.

• See also: AmbientLight.

• New in Version 1.

Further Examples