Smooth walking up the stairs

Author Mitja Felicijan <mitja.felicijan@gmail.com> 2026-05-01 04:47:33 +0200
Committer Mitja Felicijan <mitja.felicijan@gmail.com> 2026-05-01 04:47:33 +0200
Commit e08b836ffcc98c79158f493c48caf34c23a1fd3d (patch)
-rw-r--r-- all.h 1
-rw-r--r-- player.c 17
2 files changed, 17 insertions, 1 deletions
diff --git a/all.h b/all.h
...
114 
	float lean_amount;
 114 
	float lean_amount;
115 
	float crouch_amount;
 115 
	float crouch_amount;
116 
	float horizontal_speed;
 116 
	float horizontal_speed;
 
  
 117 
	float camera_offset_y; // Vertical offset for stair smoothing
117 
} PlayerState;
 118 
} PlayerState;
118 
  
 119 
  
119 
void UpdatePlayer(void);
 120 
void UpdatePlayer(void);
...
diff --git a/player.c b/player.c
...
47 
		closestHit.distance = FLT_MAX;
 47 
		closestHit.distance = FLT_MAX;
48 
		bool hitFound = false;
 48 
		bool hitFound = false;
49 
  
 49 
  
50 
		float heights[] = { -eyeHeight + 10.0f, -eyeHeight / 2.0f, 0.0f };
 50 
		// Cast rays at different heights to check for obstacles.
 
  
 51 
		// The bottom ray is raised slightly to allow stepping over small ledges/stairs.
 
  
 52 
		float heights[] = { -eyeHeight + 18.0f, -eyeHeight / 2.0f, 0.0f };
51 
		Vector3 currentPos = game.player.pos;
 53 
		Vector3 currentPos = game.player.pos;
52 
  
 54 
  
53 
		for (int i = 0; i < 3; i++) {
 55 
		for (int i = 0; i < 3; i++) {
...
91 
  
 93 
  
92 
	float verticalMove = game.player.velocity.y * dt;
 94 
	float verticalMove = game.player.velocity.y * dt;
93 
	Vector3 vStart = game.player.pos;
 95 
	Vector3 vStart = game.player.pos;
 
  
 96 
	float oldY = game.player.pos.y; // Record Y for stair smoothing snap detection
94 
  
 97 
  
95 
	if (verticalMove < 0) {
 98 
	if (verticalMove < 0) {
96 
		Vector3 start = vStart;
 99 
		Vector3 start = vStart;
...
129 
			game.player.is_grounded = false;
 132 
			game.player.is_grounded = false;
130 
		}
 133 
		}
131 
	}
 134 
	}
 
  
 135 
  
 
  
 136 
	// Stair smoothing: detect if the player position snapped vertically (e.g. stepping up a stair)
 
  
 137 
	// and apply a counter-offset to the camera to keep the movement visually smooth.
 
  
 138 
	float deltaY = game.player.pos.y - oldY;
 
  
 139 
	if (game.player.is_grounded && deltaY != 0) {
 
  
 140 
		game.player.camera_offset_y -= deltaY;
 
  
 141 
	}
132 
}
 142 
}
133 
  
 143 
  
134 
static void MoveFly(float dt) {
 144 
static void MoveFly(float dt) {
...
163 
void UpdatePlayer(void) {
 173 
void UpdatePlayer(void) {
164 
	float dt = GetFrameTime();
 174 
	float dt = GetFrameTime();
165 
	Vector3 oldPos = game.player.pos;
 175 
	Vector3 oldPos = game.player.pos;
 
  
 176 
  
 
  
 177 
	// Decay the stair smoothing offset over time
 
  
 178 
	game.player.camera_offset_y = Lerp(game.player.camera_offset_y, 0.0f, 15.0f * dt);
 
  
 179 
	if (fabsf(game.player.camera_offset_y) < 0.001f) game.player.camera_offset_y = 0.0f;
166 
  
 180 
  
167 
	if (IsKeyPressed(KEY_F)) {
 181 
	if (IsKeyPressed(KEY_F)) {
168 
		game.player.move_mode = (game.player.move_mode == MOVE_NORMAL) ? MOVE_FLY : MOVE_NORMAL;
 182 
		game.player.move_mode = (game.player.move_mode == MOVE_NORMAL) ? MOVE_FLY : MOVE_NORMAL;
...
206 
	Vector3 pivot = Vector3Subtract(game.player.pos, (Vector3){ 0, pivotDist, 0 });
 220 
	Vector3 pivot = Vector3Subtract(game.player.pos, (Vector3){ 0, pivotDist, 0 });
207 
  
 221 
  
208 
	game.camera.position = Vector3Add(pivot, rotatedOffset);
 222 
	game.camera.position = Vector3Add(pivot, rotatedOffset);
 
  
 223 
	game.camera.position.y += game.player.camera_offset_y;
209 
  
 224 
  
210 
	Vector3 forward = {
 225 
	Vector3 forward = {
211 
		cosf(game.player.pitch) * sinf(game.player.yaw),
 226 
		cosf(game.player.pitch) * sinf(game.player.yaw),
...