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2D physics header-only library for videogames developed in C using raylib library.
| Date | Stars |
|---|---|
| 2026-07-25 | 608 |
| 2026-07-28 | 608 |
| 2026-07-30 | 608 |
| 2026-08-06 | 608 |
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<img src="https://github.com/victorfisac/Physac/blob/master/icon/physac_256x256.png">
# Physac
Physac is a small 2D physics engine written in pure C. The engine uses a fixed time-step thread loop to simluate physics.
A physics step contains the following phases: get collision information, apply dynamics, collision solving and position correction. It uses a very simple struct for physic bodies with a position vector to be used in any 3D rendering API.
The header file includes some tweakable define values to fit the results that the user wants with a minimal bad results. Most of those values are commented with a little explanation about their uses.
_Note: The example code uses raylib programming library to create the program window and rendering framework._
Installation
-----
Physac requires raylib. To get it, follow the next steps:
* Go to [raylib](https://www.github.com/raysan5/raylib) and clone the repository.
* Ensure to pull the last changes of 'master' branch.
* Use code inside examples header comments to compile and execute.
Physac API
-----
The PhysicsBody struct contains all dynamics information and collision shape. The user should use the following structure components:
```c
typedef struct *PhysicsBody {
unsigned int id;
bool enabled; // Enabled dynamics state (collisions are calculated anyway)
Vector2 position; // Physics body shape pivot
Vector2 velocity; // Current linear velocity applied to position
Vector2 force; // Current linear force (reset to 0 every step)
float angularVelocity; // Current angular velocity applied to orient
float torque; // Current angular force (reset to 0 every step)
float orient; // Rotation in radians
float staticFriction; // Friction when the body has not movement (0 to 1)
float dynamicFriction; // Friction when the body has movement (0 to 1)
float restitution; // Restitution coefficient of the body (0 to 1)
bool useGravity; // Apply gravity force to dynamics
bool isGrounded; // Physics grounded on other body state
bool freezeOrient; // Physics rotation constraint
PhysicsShape shape; // Physics body shape information (type, radius, vertices, normals)
} *PhysicsBody;
```
The header contains a few customizable define values. I set the values that gived me the best results.
```c
#define PHYSAC_MAX_BODIES 64
#define PHYSAC_MAX_MANIFOLDS 4096
#define PHYSAC_MAX_VERTICES 24
#define PHYSAC_CIRCLE_VERTICES 24
#define PHYSAC_COLLISION_ITERATIONS 100
#define PHYSAC_PENETRATION_ALLOWANCE 0.05f
#define PHYSAC_PENETRATION_CORRECTION 0.4f
```
Physac contains defines for memory management functions (malloc, free) to bring the user the opportunity to implement its own memory functions:
```c
#define PHYSAC_MALLOC(size) malloc(size)
#define PHYSAC_FREE(ptr) free(ptr)
```
The Physac API functions availables for the user are the following:
```c
// Initializes physics values, pointers and creates physics loop thread
void InitPhysics(void);
// Returns true if physics thread is currently enabled
bool IsPhysicsEnabled(void);
// Sets physics global gravity force
void SetPhysicsGravity(float x, float y);
// Creates a new circle physics body with generic parameters
PhysicsBody CreatePhysicsBodyCircle(Vector2 pos, float radius, float density);
// Creates a new rectangle physics body with generic parameters
PhysicsBody CreatePhysicsBodyRectangle(Vector2 pos, float width, float height, float density);
// Creates a new polygon physics body with generic parameters
PhysicsBody CreatePhysicsBodyPolygon(Vector2 pos, float radius, int sides, float density);
// Adds a force to a physics body
void PhysicsAddForce(PhysicsBody boExcerpt of 6,223 characters
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Would you bet a product on this? Bounded 0–100 and slow moving.
matched fp:e08f927f0ca5cc46, topic:simulation