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2.5D

Used to describe raycasting engines, such as Doom or Duke Nukem. The maps are generally drawn as 2D bitmaps with height properties but when rendered gives the appearance of being 3D.

3D

Used to describe raycasting engines, such as Doom or Duke Nukem. The maps are generally drawn as 2D bitmaps with height properties but when rendered gives the appearance of being 3D.

3D

Refers to the ability to move in the X, Y and Z axis and also rotate around the X, Y, and Z axises.

 

A

Axis-aligned Bounding Box (AABB)

A form of a bounding box where the box is aligned to the axis therefore only two points in space are needed to define it. AABB’s are much faster to use, and take up less memory, but are very limited in the sense that they can only be aligned to the axis.

Albedo

An albedo is a physical measure of a material’s reflectivity, generally across the visible spectrum of light. An albedo texture simulates a surface albedo as opposed to explicitly defining a colour for it.

Alpha Blending

Assigning varying levels of translucency to graphical objects, allowing the creation of
things such as glass, fog, and ghosts. This can be accomplished by using alpha channels.

Alpha Channel

The optional channel of image data in a texture file that can be used as a transparency map, height map, specular map, etc. The format of the alpha channel is usually 8 bits per pixel (256 colors), though certain file formats support different bit depths.

Alpha Testing

A method for creating transparency by checking the alpha value of a given pixel.

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