## M

material
  A property that determines how a surface reflects light. A material has two components: an emissive property (whether it emits light) and a specular property, whose brightness is determined by a power setting.
mesh
  A set of faces, each of which is described by a simple polygon.
mipmap
  A sequence of textures, each of which is a progressively lower-resolution, prefiltered representation of the same image. A higher-resolution image is used when a visible object is close to the viewer; as the object moves farther away (and gets smaller), lower-resolution images are used.
mixing
  In DirectSound, the process of combining sound buffers that are playing and writing the result to the primary sound buffer, which supplies the sound hardware with audio data. There are no limitations to the number of buffers that can be mixed, except the practicalities of available processing time.
Mode X
  A hybrid display mode derived from the standard VGA Mode 13. This mode allows the use of up to 256KB of display memory (rather than 64KB allowed by Mode 13) by using the VGA display adapter's EGA multiple video plane system.
model coordinates
  Coordinates that are relative to a child frame. See also world coordinates.