Matrices

Data Structures
union	triMat3
	3D (3x3) Matrix More...
union	triMat4
	4D (4x4) Matrix More...

Typedefs
typedef union triMat3	triMat3
	3D (3x3) Matrix
typedef union triMat3	triMat3f
typedef union triMat4	triMat4
	4D (4x4) Matrix
typedef union triMat4	triMat4f

Functions
triMat4f *	triMat4Identity (triMat4f *a)
	Make a matrix identity.
triMat4f *	triMat4Zero (triMat4f *a)
	Make a matrix zero.
triMat4f *	triMat4Copy (triMat4f *a, const triMat4f *b)
	Copy a matrix.
triMat4f *	triMat4Mul (triMat4f *a, const triMat4f *b, const triMat4f *c)
	Matrix multiply (a = b*c).
triMat4f *	triMat4Inv (triMat4f *a, const triMat4f *b)
	Invert a matrix.
triMat4f *	triMat4Trans (triMat4f *a, const triMat4f *b)
	Transpose a matrix.
triFloat	triMat4Det (const triMat4f *a)
	Calculate matrix determinant.
triFloat	triMat4Trace (const triMat4f *a)
	Calculate matrix trace.
triVec4f *	triMat4Apply (triVec4f *a, const triMat4f *b, const triVec4f *c)
	4x4 Matrix-Vector multiply (a = b*c).
triVec4f *	triMat4Apply3 (triVec4f *a, const triMat4f *b, const triVec4f *c)
	3x3 Matrix-Vector multiply (a = b*c).

Detailed Description

Function Documentation

triMat4Identity()

triMat4f * triMat4Identity

(

triMat4f *

a

)

Make a matrix identity.

Matrix will contain the following after call:
| 1.0 0.0 0.0 0.0 |
| 0.0 1.0 0.0 0.0 |
| 0.0 0.0 1.0 0.0 |
| 0.0 0.0 0.0 1.0 |

Parameters

a	- Pointer to destination matrix

Returns

Pointer to a

triMat4Zero()

triMat4f * triMat4Zero

(

triMat4f *

a

)

Make a matrix zero.

Matrix will contain the following after call:
| 0.0 0.0 0.0 0.0 |
| 0.0 0.0 0.0 0.0 |
| 0.0 0.0 0.0 0.0 |
| 0.0 0.0 0.0 0.0 |

Parameters

a	- Pointer to destination matrix

Returns

Pointer to a

triMat4Copy()

triMat4f * triMat4Copy	(	triMat4f *	a,
		const triMat4f *	b )

Copy a matrix.

Parameters

a	- Pointer to destination matrix
b	- Pointer to matrix to be copied

Returns

Pointer to a

triMat4Mul()

triMat4f * triMat4Mul	(	triMat4f *	a,
		const triMat4f *	b,
		const triMat4f *	c )

Matrix multiply (a = b*c).

Parameters

a	- Pointer to destination matrix
b	- Pointer to first input matrix
c	- Pointer to second input matrix

Returns

Pointer to a

triMat4Inv()

triMat4f * triMat4Inv	(	triMat4f *	a,
		const triMat4f *	b )

Invert a matrix.

Full Inverse. For orthogonal matrices, triMat4Trans does the same.

Parameters

a	- Pointer to destination matrix
b	- Pointer to matrix to be inverted

Returns

Pointer to a

triMat4Trans()

triMat4f * triMat4Trans	(	triMat4f *	a,
		const triMat4f *	b )

Transpose a matrix.

Parameters

a	- Pointer to destination matrix
b	- Pointer to matrix to be transposed

Returns

Pointer to a

triMat4Det()

triFloat triMat4Det

(

const triMat4f *

a

)

Calculate matrix determinant.

Parameters

a	- Pointer to source matrix

Returns

Determinant of matrix a

triMat4Trace()

triFloat triMat4Trace

(

const triMat4f *

a

)

Calculate matrix trace.

Parameters

a	- Pointer to source matrix

Returns

Trace of matrix a

triMat4Apply()

triVec4f * triMat4Apply	(	triVec4f *	a,
		const triMat4f *	b,
		const triVec4f *	c )

4x4 Matrix-Vector multiply (a = b*c).

Parameters

a	- Pointer to dest vector
b	- Pointer to source matrix
c	- Pointer to source vector

Returns

Pointer to a

triMat4Apply3()

triVec4f * triMat4Apply3	(	triVec4f *	a,
		const triMat4f *	b,
		const triVec4f *	c )

3x3 Matrix-Vector multiply (a = b*c).

Vectors are treated as 3D Vectors and the matrix as 3D matrix. This is useful if you only want to rotate a vector by the 4x4 Matrix (no translation).

Parameters

a	- Pointer to dest vector
b	- Pointer to source matrix
c	- Pointer to source vector

Returns

Pointer to a