# osgUtil::TangentSpaceGenerator Class Reference

The TangentSpaceGenerator class generates three arrays containing tangent-space basis vectors. More...

Inheritance diagram for osgUtil::TangentSpaceGenerator:

[legend]
List of all members.

## Public Member Functions

| TangentSpaceGenerator ()
| TangentSpaceGenerator (const TangentSpaceGenerator &copy, const osg::CopyOp &copyop=osg::CopyOp::SHALLOW_COPY)
void | generate (osg::Geometry *geo, int normal_map_tex_unit=0)
osg::Vec4Array * | getTangentArray ()
const osg::Vec4Array * | getTangentArray () const
void | setTangentArray (osg::Vec4Array *array)
osg::Vec4Array * | getNormalArray ()
const osg::Vec4Array * | getNormalArray () const
void | setNormalArray (osg::Vec4Array *array)
osg::Vec4Array * | getBinormalArray ()
const osg::Vec4Array * | getBinormalArray () const
void | setBinormalArray (osg::Vec4Array *array)

## Protected Member Functions

virtual | ~TangentSpaceGenerator ()
TangentSpaceGenerator & | operator= (const TangentSpaceGenerator &)
void | compute_basis_vectors (osg::PrimitiveSet *pset, const osg::Array *vx, const osg::Array *nx, const osg::Array *tx, int iA, int iB, int iC)

## Detailed Description

The TangentSpaceGenerator class generates three arrays containing tangent-space basis vectors.

It takes a texture-mapped Geometry object as input, traverses its primitive sets and computes Tangent, Normal and Binormal vectors for each vertex, storing them into arrays. The resulting arrays can be used as vertex program varying (per-vertex) parameters, enabling advanced effects like bump-mapping. To use this class, simply call the generate() method specifying the Geometry object you want to process and the texture unit that contains UV mapping for the normal map; then you can retrieve the TBN arrays by calling getTangentArray(), getNormalArray() and getBinormalArray() methods.

## Constructor & Destructor Documentation

TangentSpaceGenerator::TangentSpaceGenerator | ( |  | ) |

TangentSpaceGenerator::TangentSpaceGenerator | ( | const TangentSpaceGenerator & | copy,
|  | const osg::CopyOp & | copyop = `osg::CopyOp::SHALLOW_COPY`
| ) |

virtual osgUtil::TangentSpaceGenerator::~TangentSpaceGenerator | ( |  | ) | `[inline, protected, virtual]`

## Member Function Documentation

void TangentSpaceGenerator::compute_basis_vectors | ( | osg::PrimitiveSet * | pset,
|  | const osg::Array * | vx,
|  | const osg::Array * | nx,
|  | const osg::Array * | tx,
|  | int | iA,
|  | int | iB,
|  | int | iC
| ) | `[protected]`

void TangentSpaceGenerator::generate | ( | osg::Geometry * | geo,
|  | int | normal_map_tex_unit = `0`
| ) |

const osg::Vec4Array* osgUtil::TangentSpaceGenerator::getBinormalArray | ( |  | ) | const`[inline]`

osg::Vec4Array* osgUtil::TangentSpaceGenerator::getBinormalArray | ( |  | ) | `[inline]`

const osg::Vec4Array* osgUtil::TangentSpaceGenerator::getNormalArray | ( |  | ) | const`[inline]`

osg::Vec4Array* osgUtil::TangentSpaceGenerator::getNormalArray | ( |  | ) | `[inline]`

const osg::Vec4Array* osgUtil::TangentSpaceGenerator::getTangentArray | ( |  | ) | const`[inline]`

osg::Vec4Array* osgUtil::TangentSpaceGenerator::getTangentArray | ( |  | ) | `[inline]`

TangentSpaceGenerator& osgUtil::TangentSpaceGenerator::operator= | ( | const TangentSpaceGenerator & |  | ) | `[inline, protected]`

void osgUtil::TangentSpaceGenerator::setBinormalArray | ( | osg::Vec4Array * | array | ) | `[inline]`

void osgUtil::TangentSpaceGenerator::setNormalArray | ( | osg::Vec4Array * | array | ) | `[inline]`

void osgUtil::TangentSpaceGenerator::setTangentArray | ( | osg::Vec4Array * | array | ) | `[inline]`

The documentation for this class was generated from the following files:

- TangentSpaceGenerator
- TangentSpaceGenerator.cpp