E

emissive property

The material property that determines whether a material emits light. The emissive property of a material is one of two properties that determines how the material reflects light. See also specular property.

emissive setting

See emissive property.

enable frame

The frame to which a light applies.

envelope

In force feedback, a set of values that defines the shape of an effect by modifying the magnitude at the beginning (attack) and end (fade).

In audio, a set of values that defines the shape of the amplitude or pitch of a sound. DLS level 1 defines a four-segment envelope: attack, decay, sustain, and release (ADSR). DLS level 2 defines six segments: delay, attack, hold, decay, sustain, and release (DAHDSR).

even field

The second field comprising a video frame in an odd/even field set. Also known as field 2.

execute buffer

A fully self-contained, independent packet of information that describes a 3-D scene. An execute buffer contains a vertex list followed by an instruction stream. The instruction stream consists of operation codes, or opcodes, and the data that is operated on by those opcodes.