Box2D: b2Settings.h File Reference

Box2D

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b2Settings.h File Reference

Global tuning constants based on meters-kilograms-seconds (MKS) units. More...

Classes

struct  b2Version
 Version numbering scheme. More...

Functions

void * b2Alloc (int32 size)
 Implement this function to use your own memory allocator.
void b2Free (void *mem)
 If you implement b2Alloc, you should also implement this function.
float32 b2MixFriction (float32 friction1, float32 friction2)
 Friction mixing law. Feel free to customize this.
float32 b2MixRestitution (float32 restitution1, float32 restitution2)
 Restitution mixing law. Feel free to customize this.

Variables

const float32 b2_linearSlop = 0.005f
 A small length used as a collision and constraint tolerance.
const float32 b2_angularSlop = 2.0f / 180.0f * b2_pi
 A small angle used as a collision and constraint tolerance.
const float32 b2_toiSlop = 8.0f * b2_linearSlop
 Continuous collision detection (CCD) works with core, shrunken shapes.
const int32 b2_maxTOIContactsPerIsland = 32
 Maximum number of contacts to be handled to solve a TOI island.
const float32 b2_velocityThreshold = 1.0f
 A velocity threshold for elastic collisions.
const float32 b2_maxLinearCorrection = 0.2f
 The maximum linear position correction used when solving constraints.
const float32 b2_maxAngularCorrection = 8.0f / 180.0f * b2_pi
 The maximum angular position correction used when solving constraints.
const float32 b2_maxLinearVelocity = 200.0f
 The maximum linear velocity of a body.
const float32 b2_maxAngularVelocity = 250.0f
 The maximum angular velocity of a body.
const float32 b2_contactBaumgarte = 0.2f
 This scale factor controls how fast overlap is resolved.
const float32 b2_timeToSleep = 0.5f
 The time that a body must be still before it will go to sleep.
const float32 b2_linearSleepTolerance = 0.01f
 A body cannot sleep if its linear velocity is above this tolerance.
const float32 b2_angularSleepTolerance = 2.0f / 180.0f
 A body cannot sleep if its angular velocity is above this tolerance.
int32 b2_byteCount
 The current number of bytes allocated through b2Alloc.
b2Version b2_version
 Current version.

Detailed Description

Global tuning constants based on meters-kilograms-seconds (MKS) units.

Variable Documentation

const float32 b2_angularSlop = 2.0f / 180.0f * b2_pi

A small angle used as a collision and constraint tolerance.

Usually it is chosen to be numerically significant, but visually insignificant.

const float32 b2_contactBaumgarte = 0.2f

This scale factor controls how fast overlap is resolved.

Ideally this would be 1 so that overlap is removed in one time step. However using values close to 1 often lead to overshoot.

const float32 b2_linearSlop = 0.005f

A small length used as a collision and constraint tolerance.

Usually it is chosen to be numerically significant, but visually insignificant.

const float32 b2_maxAngularCorrection = 8.0f / 180.0f * b2_pi

The maximum angular position correction used when solving constraints.

This helps to prevent overshoot.

const float32 b2_maxAngularVelocity = 250.0f

The maximum angular velocity of a body.

This limit is very large and is used to prevent numerical problems. You shouldn't need to adjust this.

const float32 b2_maxLinearCorrection = 0.2f

The maximum linear position correction used when solving constraints.

This helps to prevent overshoot.

const float32 b2_maxLinearVelocity = 200.0f

The maximum linear velocity of a body.

This limit is very large and is used to prevent numerical problems. You shouldn't need to adjust this.

const float32 b2_toiSlop = 8.0f * b2_linearSlop

Continuous collision detection (CCD) works with core, shrunken shapes.

This is the amount by which shapes are automatically shrunk to work with CCD. This must be larger than b2_linearSlop.

const float32 b2_velocityThreshold = 1.0f

A velocity threshold for elastic collisions.

Any collision with a relative linear velocity below this threshold will be treated as inelastic.

Generated on Sun Apr 13 15:21:27 2008 for Box2D by  doxygen 1.5.4

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