---

N
[Glossary]

Glossary entries beginning with N.

NBT

Refers to a set of three vectors representing vertex normal, binormal, and tangent. These form a set of orthogonal axes where, for a given point on a surface, the normal is perpendicular to the surface, and the binormal and tangent are tangential to it. They may be considered to define a local coordinate system at the vertex, and are particularly useful for surface lighting effects.

Normal Maps

Normal maps are textures that store a normal per pixel encoded as a color, converting the components of the normals from the range [-1..1] to [0..255]. These normals are used for per-pixel lighting using the NBT information. This can be used to good effect with low-polygon models to simulate a highly tesselated surface.

Bump maps can be considered similar to normal maps except they only store a height value.

Note:

Normal maps are only supported on Xbox and D3D9.

See also:

Bumpmap

See also:

RpNormMap Plugin Overview , RtNormMap Toolkit Overview

Normals

Normals are vectors that usually define the outward pointing perpendicular to a surface. However, they may equally be the inward pointing perpendicular. They may be associated with vertices or polygon faces.

---