SimpleSmoothModifier Class Reference

Modifier which smooths the path. More...

Detailed Description

Modifier which smooths the path.

This modifier can smooth a path by either moving the points closer together (Simple) or using Bezier curves (Bezier).

Attach this component to the same GameObject as a Seeker component.
This component will hook in to the Seeker's path post-processing system and will post process any paths it searches for. Take a look at the Modifier Priorities settings on the Seeker component to determine where in the process this modifier should process the path.

Several smoothing types are available, here follows a list of them and a short description of what they do, and how they work. But the best way is really to experiment with them yourself.

• Simple Smooths the path by drawing all points close to each other. This results in paths that might cut corners if you are not careful. It will also subdivide the path to create more more points to smooth as otherwise it would still be quite rough.
  
• Bezier Smooths the path using Bezier curves. This results a smooth path which will always pass through all points in the path, but make sure it doesn't turn too quickly.
  
• OffsetSimple An alternative to Simple smooth which will offset the path outwards in each step to minimize the corner-cutting. But be careful, if too high values are used, it will turn into loops and look really ugly.
• Curved Non Uniform
  

Note

Modifies vectorPath array

Todo:

Make the smooth modifier take the world geometry into account when smoothing

Public Types
enum	SmoothType { Simple, Bezier, OffsetSimple, CurvedNonuniform }

Public Member Functions
override void	Apply (Path p, ModifierData source)
	Main Post-Processing function.
List< Vector3 >	CurvedNonuniform (List< Vector3 > path)
List< Vector3 >	SmoothBezier (List< Vector3 > path)
List< Vector3 >	SmoothOffsetSimple (List< Vector3 > path)
List< Vector3 >	SmoothSimple (List< Vector3 > path)
Public Member Functions inherited from MonoModifier
virtual Vector3[]	Apply (GraphNode[] path, Vector3 start, Vector3 end, int startIndex, int endIndex, NavGraph graph)
virtual Vector3[]	Apply (Vector3[] path, Vector3 start, Vector3 end)
virtual void	ApplyOriginal (Path p)
void	Awake ()
	Alerts the Seeker that this modifier exists.
void	OnDestroy ()
void	OnDisable ()
void	OnEnable ()
virtual void	PreProcess (Path p)
Public Member Functions inherited from IPathModifier
void	Apply (Path p, ModifierData source)
void	ApplyOriginal (Path p)
void	PreProcess (Path p)

Static Public Member Functions
static Vector3	GetPointOnCubic (Vector3 a, Vector3 b, Vector3 tan1, Vector3 tan2, float t)

Public Attributes
float	bezierTangentLength = 0.4F
	Length factor of the bezier curves' tangents'.
float	factor = 0.1F
	Roundness factor used for CurvedNonuniform.
int	iterations = 2
	Number of times to apply smoothing.
float	maxSegmentLength = 2F
	The length of the segments in the smoothed path when using uniformLength.
float	offset = 0.2F
	Offset to apply in each smoothing iteration when using Offset Simple.
SmoothType	smoothType = SmoothType.Simple
	Type of smoothing to use.
float	strength = 0.5F
	The strength of the smoothing.
int	subdivisions = 2
	Number of times to subdivide when not using a uniform length.
bool	uniformLength = true
	Toggle to divide all lines in equal length segments.
Public Attributes inherited from MonoModifier
int	priority
	Higher priority modifiers are executed first.
Seeker	seeker

Properties
override ModifierData	input [get]
override ModifierData	output [get]
Properties inherited from MonoModifier
abstract ModifierData	input [get]
abstract ModifierData	output [get]
int	Priority [get, set]
Properties inherited from IPathModifier
ModifierData	input [get]
ModifierData	output [get]
int	Priority [get, set]

Member Enumeration Documentation

enum SmoothType

Enumerator:

Simple
Bezier
OffsetSimple
CurvedNonuniform

Member Function Documentation

override void Apply ( Path  p, ModifierData  source  )

virtual

Main Post-Processing function.

Implements MonoModifier.

List<Vector3> CurvedNonuniform

(

List< Vector3 >

path

)

static Vector3 GetPointOnCubic ( Vector3  a, Vector3  b, Vector3  tan1, Vector3  tan2, float  t  )

static

List<Vector3> SmoothBezier

(

List< Vector3 >

path

)

List<Vector3> SmoothOffsetSimple

(

List< Vector3 >

path

)

List<Vector3> SmoothSimple

(

List< Vector3 >

path

)

Member Data Documentation

float bezierTangentLength = 0.4F

Length factor of the bezier curves' tangents'.

float factor = 0.1F

Roundness factor used for CurvedNonuniform.

int iterations = 2

Number of times to apply smoothing.

float maxSegmentLength = 2F

The length of the segments in the smoothed path when using uniformLength.

A high value yields rough paths and low value yields very smooth paths, but is slower

float offset = 0.2F

Offset to apply in each smoothing iteration when using Offset Simple.

See Also

smoothType

SmoothType smoothType = SmoothType.Simple

Type of smoothing to use.

float strength = 0.5F

The strength of the smoothing.

A value from 0 to 1 is recommended, but values larger than 1 works too.

int subdivisions = 2

Number of times to subdivide when not using a uniform length.

bool uniformLength = true

Toggle to divide all lines in equal length segments.

See Also

maxSegmentLength

Property Documentation

override ModifierData input

get

override ModifierData output

get

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

• /Users/arong/Unity/a-pathfinding-project/Assets/AstarPathfindingProject/Modifiers/SimpleSmoothModifier.cs