quaternion

Documentation

Index

• type Quaternion
  • func FromTheta(theta float64, v vector3.Float64) Quaternion
  • func New(v vector3.Float64, w float64) Quaternion
  • func RotationTo(from, to vector3.Float64) Quaternion
  • func Zero() Quaternion
  • func (q Quaternion) Dir() vector3.Float64
  • func (q Quaternion) Multiply(other Quaternion) Quaternion
  • func (q Quaternion) Normalize() Quaternion
  • func (q Quaternion) Rotate(v vector3.Float64) vector3.Float64
  • func (q Quaternion) RotateArray(arr []vector3.Float64) []vector3.Float64
  • func (q Quaternion) W() float64

Types

type Quaternion

type Quaternion struct {
	// contains filtered or unexported fields
}

Quaternion is a 4 component imaginary number thingy for rotating 3D meshes.

func FromTheta

func FromTheta(theta float64, v vector3.Float64) Quaternion

UnitQuaternionFromTheta takes a vector and angle and builds a unit quaternion in the form (cos(theta/2.0), sin(theta/2.0))

Resources Used:

https://www.youtube.com/watch?v=mHVwd8gYLnI
https://en.wikipedia.org/wiki/Quaternions_and_spatial_rotation

func New

func New(v vector3.Float64, w float64) Quaternion

NewQuaternion creates a quaternion

func RotationTo

func RotationTo(from, to vector3.Float64) Quaternion

https://github.com/toji/gl-matrix/blob/f0583ef53e94bc7e78b78c8a24f09ed5e2f7a20c/src/gl-matrix/quat.js#L54

func Zero

func Zero() Quaternion

QuaternionZero returns a quaternion with 0 for all it's components

func (Quaternion) Dir

func (q Quaternion) Dir() vector3.Float64

func (Quaternion) Multiply

func (q Quaternion) Multiply(other Quaternion) Quaternion

https://github.com/toji/gl-matrix/blob/f0583ef53e94bc7e78b78c8a24f09ed5e2f7a20c/src/gl-matrix/quat.js#L179

func (Quaternion) Normalize

func (q Quaternion) Normalize() Quaternion

func (Quaternion) Rotate

func (q Quaternion) Rotate(v vector3.Float64) vector3.Float64

Rotate takes a given vector and rotates it with by this quaternion.

Resources Used:

https://gamedev.stackexchange.com/questions/28395

func (Quaternion) RotateArray

func (q Quaternion) RotateArray(arr []vector3.Float64) []vector3.Float64

func (Quaternion) W

func (q Quaternion) W() float64