Box2D: b2Mat33 Struct Reference

| Box2D 2.4.1 A 2D physics engine for games

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Public Member Functions | Public Attributes | List of all members
b2Mat33 Struct Reference

A 3-by-3 matrix. Stored in column-major order. More...

`#include <b2_math.h>`

## Public Member Functions
| b2Mat33 ()
| The default constructor does nothing (for performance).
| b2Mat33 (const b2Vec3 &c1, const b2Vec3 &c2, const b2Vec3 &c3)
| Construct this matrix using columns.
void | SetZero ()
| Set this matrix to all zeros.
b2Vec3 | Solve33 (const b2Vec3 &b) const
b2Vec2 | Solve22 (const b2Vec2 &b) const
void | GetInverse22 (b2Mat33 *M) const
void | GetSymInverse33 (b2Mat33 *M) const

## Public Attributes
b2Vec3 | ex
b2Vec3 | ey
b2Vec3 | ez

## Detailed Description

A 3-by-3 matrix. Stored in column-major order.

## Member Function Documentation

## ◆ GetInverse22()

void b2Mat33::GetInverse22 | ( | b2Mat33 * | M | ) | const

Get the inverse of this matrix as a 2-by-2. Returns the zero matrix if singular.

## ◆ GetSymInverse33()

void b2Mat33::GetSymInverse33 | ( | b2Mat33 * | M | ) | const

Get the symmetric inverse of this matrix as a 3-by-3. Returns the zero matrix if singular.

## ◆ Solve22()

b2Vec2 b2Mat33::Solve22 | ( | const b2Vec2 & | b | ) | const

Solve A * x = b, where b is a column vector. This is more efficient than computing the inverse in one-shot cases. Solve only the upper 2-by-2 matrix equation.

## ◆ Solve33()

b2Vec3 b2Mat33::Solve33 | ( | const b2Vec3 & | b | ) | const

Solve A * x = b, where b is a column vector. This is more efficient than computing the inverse in one-shot cases.

The documentation for this struct was generated from the following file:

- /build/box2d/src/box2d-2.4.1/include/box2d/b2_math.h