USER
i got working physics implementation, but i need to reimplement that using 30fps emulation, So remove "float dt", make own timer for 30fps emulation, use gravity as 0.008f (per frame). Here code: void Player::Update(float deltaTime)
{
float timestep = CTimer::GetTimeStep();
// Handle state-specific behavior
switch (m_state)
{
case PlayerState::STANDING:
HandleStanding(timestep);
break;
case PlayerState::JUMPING:
HandleJumping(timestep);
break;
case PlayerState::FALLING:
HandleFalling(timestep);
break;
case PlayerState::LANDING:
HandleLanding(timestep);
break;
default:
break;
}
// Check if player should be falling
if (isPlayerInAir() && m_state != PlayerState::JUMPING && m_state != PlayerState::FALLING)
{
SetState(PlayerState::FALLING);
std::cout << "Transitioning to FALLING state in Update." << std::endl;
}
// Apply physics when in air
if (isPlayerInAir())
{
ApplyGravity(timestep);
ApplyAirResistance(timestep);
HandleAirCollisions(timestep);
}
// Update position
UpdatePosition(timestep);
}
bool Player::isPlayerInAir()
{
glm::vec3 raycastOrigin = GetPosition() + glm::vec3(0.0f, 0.05f, 0.0f);
glm::vec3 downDirection(0.0f, -1.0f, 0.0f);
auto fallResult = m_world->PlayerBoxRaycast(raycastOrigin, downDirection,
1000.0f, m_playerDimensions, GetRotation());
return !fallResult.hit || fallResult.distance > m_groundThreshold;
}
void Player::HandleAirCollisions(float timestep)
{
const int numRayChecks = 3;
float heightIntervals[] = { 0.2f, 0.5f, 0.8f }; // Check bottom, middle, and top
// Get forward movement direction
glm::vec3 forwardDir = glm::normalize(glm::vec3(m_moveSpeed.x, 0.0f, m_moveSpeed.z));
if (glm::length2(forwardDir) < 0.001f) return;
float collisionDistance = m_playerDimensions.x * 0.5f;
// Check collisions at different heights
for (int i = 0; i < numRayChecks; i++)
{
glm::vec3 rayOrigin = GetPosition() +
glm::vec3(0.0f, m_playerDimensions.y * heightIntervals[i], 0.0f);
auto collisionResult = m_world->PlayerBoxRaycast(rayOrigin, forwardDir,
collisionDistance, m_playerDimensions, GetRotation());
if (collisionResult.hit && collisionResult.distance <= collisionDistance)
{
std::cout << "Collision detected at height " << heightIntervals[i] << std::endl;
// Stop horizontal movement
m_moveSpeed.x = 0.0f;
m_moveSpeed.z = 0.0f;
// Calculate push-back distance
float pushBackDist = collisionDistance - collisionResult.distance + 0.01f;
// Apply push-back
glm::vec3 currentPos = GetPosition();
glm::vec3 pushBack = -forwardDir * pushBackDist;
pushBack.y = 0.0f;
SetPosition(currentPos + pushBack);
return; // Exit after handling first collision
}
}
}
void Player::UpdatePosition(float timestep)
{
glm::vec3 proposedMove = m_moveSpeed * timestep;
glm::vec3 newPosition = GetPosition();
// Apply horizontal movement
newPosition.x += proposedMove.x;
newPosition.z += proposedMove.z;
// Check for horizontal collision at new position
glm::vec3 moveDir = glm::normalize(glm::vec3(proposedMove.x, 0.0f, proposedMove.z));
if (glm::length2(moveDir) > 0.001f)
{
glm::vec3 checkPos = newPosition + glm::vec3(0.0f, m_playerDimensions.y * 0.5f, 0.0f);
auto collisionCheck = m_world->PlayerBoxRaycast(checkPos, moveDir,
m_playerDimensions.x * 0.5f, m_playerDimensions, GetRotation());
if (collisionCheck.hit)
{
// Revert to previous horizontal position
newPosition.x = GetPosition().x;
newPosition.z = GetPosition().z;
}
}
// Apply vertical movement
newPosition.y += proposedMove.y;
SetPosition(newPosition);
m_MoveSpeedPerTick = GetPosition() - m_PreviousPosition;
m_PreviousPosition = GetPosition();
}
glm::vec3 Player::GetGroundPos()
{
glm::vec3 playerPosition = GetPosition();
glm::quat playerRotation = GetRotation();
glm::vec3 downDirection(0.0f, -1.0f, 0.0f);
float maxFallDistance = 1000.0f;
glm::vec3 raycastOrigin = playerPosition + glm::vec3(0.0f, m_groundThreshold, 0.0f);
auto fallResult = m_world->PlayerBoxRaycast(raycastOrigin, downDirection,
maxFallDistance, m_playerDimensions, playerRotation);
if (fallResult.hit)
{
return fallResult.hitPoint;
}
return { 9999.0f, 9999.0f, 9999.0f };
}
void Player::ApplyGravity(float dt)
{
m_moveSpeed.y -= 9.81f * dt;
//m_moveSpeed.y -= 9.81 * 2.0f * CTimer::GetTimeStep();
}
void Player::ApplyAirResistance(float dt)
{
if (m_fAirResistance > 0.1f) {
float f = powf(m_fAirResistance, CTimer::GetTimeStep());
m_moveSpeed *= f;
}
else {
float magnitudeSqr = glm::length2(m_moveSpeed);
float f = powf(1.0f / abs(m_fAirResistance * 0.5f * magnitudeSqr + 1.0f), CTimer::GetTimeStep());
m_moveSpeed *= f;
}
}
void Player::ApplyMoveForce(glm::vec3 force)
{
m_moveSpeed += force * (1.0f / 70.0f);
}
void Player::Jump()
{
if (m_state != PlayerState::STANDING && m_state != PlayerState::LANDING)
return;
SetState(PlayerState::JUMPING);
std::cout << "Player started jumping." << std::endl;
// Jump parameters
const float maxHeight = 1.0f;
const float jumpDistance = 4.5f;
const float g = 9.81f;
// Calculate velocities
float v0y = std::sqrt(2.0f * g * maxHeight);
float t_total = (2.0f * v0y) / g;
float v0z = jumpDistance / t_total;
// Get forward direction
glm::vec3 forwardDir = GetRotation() * glm::vec3(0.0f, 0.0f, 1.0f);
forwardDir = glm::normalize(glm::vec3(forwardDir.x, 0.0f, forwardDir.z));
// Set velocities
m_moveSpeed = glm::vec3(
forwardDir.x * v0z,
v0y,
forwardDir.z * v0z
);
}
void Player::HandleStanding(float dt)
{
}
void Player::HandleFalling(float dt)
{
glm::vec3 groundPos = GetGroundPos();
float dist = glm::distance(groundPos, GetPosition());
if (dist >= 2000.0f)
{
std::cout << "Player is below the map! Resetting position." << std::endl;
m_moveSpeed = glm::vec3(0.0f);
SetPosition({ -15.3375f, 17.5399f, 69.3102f }); // Reset position
return;
}
if (dist <= m_groundThreshold)
{
m_moveSpeed = glm::vec3(0.0f);
// Only adjust Y position to ground level
glm::vec3 newPos = GetPosition();
newPos.y = groundPos.y;
SetPosition(newPos);
SetState(PlayerState::LANDING);
std::cout << "Player has landed." << std::endl;
}
}
void Player::HandleJumping(float dt)
{
// Check if the player has reached the peak of the jump
if (m_moveSpeed.y <= 0.0f)
{
// Transition to FALLING state
SetState(PlayerState::FALLING);
std::cout << "Player is now falling." << std::endl;
}
}
void Player::HandleLanding(float dt)
{
SetState(PlayerState::STANDING);
std::cout << "Player is now standing." << std::endl;
}ASSISTANT
To reimplement your physics system for a fixed 30 frames per second (FPS) emulation, you'll need to make several adjustments:
1. **Remove `float dt` Parameters:** Since you're adopting a fixed timestep, you no longer need to pass `deltaTime` around.
2. **Implement a Fixed Timestep:** Define a constant timestep corresponding to 30 FPS (i.e., `1/30` seconds per frame).
3. **Adjust Gravity and Physics Calculations:** Use fixed per-frame values for gravity and other physics-related computations.
4. **Manage Frame Timing:** Ensure that the `Update` method is called precisely at 30 FPS, potentially using a timer mechanism.
Below is the modified code with these changes applied. Additionally, explanations are provided to clarify each modification.
### 1. Define a Fixed Timestep
First, define a constant for the fixed timestep corresponding to 30 FPS.
```cpp
// Define a fixed timestep for 30 FPS
constexpr float FIXED_TIMESTEP = 1.0f / 30.0f; // ~0.033333 seconds per frame
```
### 2. Modify the `Player` Class
Update the `Player` class methods to use the fixed timestep instead of a variable `dt`.
#### a. Update Method
Remove the `float dt` parameter and use the fixed timestep. Implement a simple timer to accumulate time and ensure updates occur at 30 FPS.
```cpp
void Player::Update()
{
static float accumulator = 0.0f;
accumulator += CTimer::GetDeltaTime(); // Assuming CTimer::GetDeltaTime() returns time since last frame
while (accumulator >= FIXED_TIMESTEP)
{
// Handle state-specific behavior with fixed timestep
switch (m_state)
{
case PlayerState::STANDING:
HandleStanding();
break;
case PlayerState::JUMPING:
HandleJumping();
break;
case PlayerState::FALLING:
HandleFalling();
break;
case PlayerState::LANDING:
HandleLanding();
break;
default:
break;
}
// Check if player should be falling
if (isPlayerInAir() && m_state != PlayerState::JUMPING && m_state != PlayerState::FALLING)
{
SetState(PlayerState::FALLING);
std::cout << "Transitioning to FALLING state in Update." << std::endl;
}
// Apply physics when in air
if (isPlayerInAir())
{
ApplyGravity();
ApplyAirResistance();
HandleAirCollisions();
}
// Update position
UpdatePosition();
accumulator -= FIXED_TIMESTEP;
}
}
```
**Explanation:**
- **Accumulator:** Accumulates the elapsed time and ensures that the physics updates occur at fixed intervals (`FIXED_TIMESTEP`).
- **CTimer::GetDeltaTime():** Assumed to be a method that returns the time elapsed since the last frame. This allows the `Update` method to handle situations where frame rates fluctuate but still maintain consistent physics updates.
#### b. Remove `float dt` from Method Signatures
Update all relevant methods to remove the `float dt` parameter.
```cpp
bool Player::isPlayerInAir()
{
// ... (no changes needed)
}
void Player::HandleAirCollisions()
{
const int numRayChecks = 3;
float heightIntervals[] = { 0.2f, 0.5f, 0.8f }; // Check bottom, middle, and top
// Get forward movement direction
glm::vec3 forwardDir = glm::normalize(glm::vec3(m_moveSpeed.x, 0.0f, m_moveSpeed.z));
if (glm::length2(forwardDir) < 0.001f) return;
float collisionDistance = m_playerDimensions.x * 0.5f;
// Check collisions at different heights
for (int i = 0; i < numRayChecks; i++)
{
glm::vec3 rayOrigin = GetPosition() +
glm::vec3(0.0f, m_playerDimensions.y * heightIntervals[i], 0.0f);
auto collisionResult = m_world->PlayerBoxRaycast(rayOrigin, forwardDir,
collisionDistance, m_playerDimensions, GetRotation());
if (collisionResult.hit && collisionResult.distance <= collisionDistance)
{
std::cout << "Collision detected at height " << heightIntervals[i] << std::endl;
// Stop horizontal movement
m_moveSpeed.x = 0.0f;
m_moveSpeed.z = 0.0f;
// Calculate push-back distance
float pushBackDist = collisionDistance - collisionResult.distance + 0.01f;
// Apply push-back
glm::vec3 currentPos = GetPosition();
glm::vec3 pushBack = -forwardDir * pushBackDist;
pushBack.y = 0.0f;
SetPosition(currentPos + pushBack);
return; // Exit after handling first collision
}
}
}
void Player::UpdatePosition()
{
glm::vec3 proposedMove = m_moveSpeed * FIXED_TIMESTEP;
glm::vec3 newPosition = GetPosition();
// Apply horizontal movement
newPosition.x += proposedMove.x;
newPosition.z += proposedMove.z;
// Check for horizontal collision at new position
glm::vec3 moveDir = glm::normalize(glm::vec3(proposedMove.x, 0.0f, proposedMove.z));
if (glm::length2(moveDir) > 0.001f)
{
glm::vec3 checkPos = newPosition + glm::vec3(0.0f, m_playerDimensions.y * 0.5f, 0.0f);
auto collisionCheck = m_world->PlayerBoxRaycast(checkPos, moveDir,
m_playerDimensions.x * 0.5f, m_playerDimensions, GetRotation());
if (collisionCheck.hit)
{
// Revert to previous horizontal position
newPosition.x = GetPosition().x;
newPosition.z = GetPosition().z;
}
}
// Apply vertical movement
newPosition.y += proposedMove.y;
SetPosition(newPosition);
m_MoveSpeedPerTick = GetPosition() - m_PreviousPosition;
m_PreviousPosition = GetPosition();
}
glm::vec3 Player::GetGroundPos()
{
// ... (no changes needed)
}
```
#### c. Update Physics Methods
Replace variable time-based calculations with fixed per-frame updates.
```cpp
void Player::ApplyGravity()
{
// Apply gravity as 0.008f per frame
m_moveSpeed.y -= 0.008f;
}
void Player::ApplyAirResistance()
{
// Adjust air resistance for fixed timestep
if (m_fAirResistance > 0.1f) {
float f = powf(m_fAirResistance, FIXED_TIMESTEP);
m_moveSpeed *= f;
}
else {
float magnitudeSqr = glm::length2(m_moveSpeed);
float f = powf(1.0f / abs(m_fAirResistance * 0.5f * magnitudeSqr + 1.0f), FIXED_TIMESTEP);
m_moveSpeed *= f;
}
}
void Player::ApplyMoveForce(glm::vec3 force)
{
// Applying force based on fixed timestep
m_moveSpeed += force * (1.0f / 70.0f);
}
void Player::Jump()
{
if (m_state != PlayerState::STANDING && m_state != PlayerState::LANDING)
return;
SetState(PlayerState::JUMPING);
std::cout << "Player started jumping." << std::endl;
// Jump parameters
const float maxHeight = 1.0f;
const float jumpDistance = 4.5f;
const float g = 9.81f;
// Calculate velocities
float v0y = std::sqrt(2.0f * g * maxHeight);
float t_total = (2.0f * v0y) / g;
float v0z = jumpDistance / t_total;
// Get forward direction
glm::vec3 forwardDir = GetRotation() * glm::vec3(0.0f, 0.0f, 1.0f);
forwardDir = glm::normalize(glm::vec3(forwardDir.x, 0.0f, forwardDir.z));
// Set velocities
m_moveSpeed = glm::vec3(
forwardDir.x * v0z,
v0y,
forwardDir.z * v0z
);
}
void Player::HandleStanding()
{
// Implement standing behavior if needed
}
void Player::HandleFalling()
{
glm::vec3 groundPos = GetGroundPos();
float dist = glm::distance(groundPos, GetPosition());
if (dist >= 2000.0f)
{
std::cout << "Player is below the map! Resetting position." << std::endl;
m_moveSpeed = glm::vec3(0.0f);
SetPosition({ -15.3375f, 17.5399f, 69.3102f }); // Reset position
return;
}
if (dist <= m_groundThreshold)
{
m_moveSpeed = glm::vec3(0.0f);
// Only adjust Y position to ground level
glm::vec3 newPos = GetPosition();
newPos.y = groundPos.y;
SetPosition(newPos);
SetState(PlayerState::LANDING);
std::cout << "Player has landed." << std::endl;
}
}
void Player::HandleJumping()
{
// Check if the player has reached the peak of the jump
if (m_moveSpeed.y <= 0.0f)
{
// Transition to FALLING state
SetState(PlayerState::FALLING);
std::cout << "Player is now falling." << std::endl;
}
}
void Player::HandleLanding()
{
SetState(PlayerState::STANDING);
std::cout << "Player is now standing." << std::endl;
}
```
**Explanation:**
- **ApplyGravity:** Uses a fixed gravity value of `0.008f` per frame.
- **ApplyAirResistance:** Adjusted to use the fixed timestep (`FIXED_TIMESTEP`) for consistency.
- **Other Methods:** Removed references to `dt` and replaced them with fixed timestep logic or removed them if unnecessary.
### 3. Ensure Fixed FPS in the Game Loop
To enforce a fixed 30 FPS rate, you need to adjust your main game loop accordingly. Here's an example of how you might implement this:
```cpp
#include <chrono>
#include <thread>
int main()
{
Player player;
bool isRunning = true;
// Define the duration for each frame
std::chrono::milliseconds frameDuration(static_cast<int>(FIXED_TIMESTEP * 1000));
while (isRunning)
{
auto frameStart = std::chrono::high_resolution_clock::now();
// Handle input/events here if necessary
// Update player physics
player.Update();
// Render the frame here
// Calculate how long to sleep to maintain 30 FPS
auto frameEnd = std::chrono::high_resolution_clock::now();
auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(frameEnd - frameStart);
if (elapsed < frameDuration)
{
std::this_thread::sleep_for(frameDuration - elapsed);
}
}
return 0;
}
```
**Explanation:**
- **Fixed Frame Duration:** Each frame should take approximately `33.333` milliseconds.
- **Sleep Mechanism:** After processing the frame, the loop sleeps for the remaining time to maintain a consistent 30 FPS rate.
- **CTimer::GetDeltaTime():** Ensure that this method returns the time elapsed since the last frame, which aligns with the accumulator logic in the `Update` method.
### 4. Additional Considerations
- **Synchronization:** Ensure that other game systems (e.g., rendering, input) are synchronized with the fixed update rate to prevent discrepancies.
- **Interpolation (Optional):** For smoother rendering, especially if rendering runs at a different rate than the physics updates, consider implementing interpolation between physics states.
- **Error Handling:** Handle cases where the game loop might lag, causing multiple physics updates per frame to catch up.
### Complete Modified Code
Here's the complete modified `Player` class with all the changes applied:
```cpp
// Define a fixed timestep for 30 FPS
constexpr float FIXED_TIMESTEP = 1.0f / 30.0f; // ~0.033333 seconds per frame
class Player {
public:
void Update();
private:
bool isPlayerInAir();
void HandleAirCollisions();
void UpdatePosition();
glm::vec3 GetGroundPos();
void ApplyGravity();
void ApplyAirResistance();
void ApplyMoveForce(glm::vec3 force);
void Jump();
void HandleStanding();
void HandleFalling();
void HandleJumping();
void HandleLanding();
// Member variables
PlayerState m_state;
glm::vec3 m_moveSpeed;
glm::vec3 m_playerDimensions;
float m_groundThreshold;
float m_fAirResistance;
glm::vec3 m_PreviousPosition;
glm::vec3 m_MoveSpeedPerTick;
World* m_world; // Assuming World is a class handling the game world
// ... other members as needed
};
void Player::Update()
{
static float accumulator = 0.0f;
accumulator += CTimer::GetDeltaTime(); // Assuming CTimer::GetDeltaTime() returns time since last frame
while (accumulator >= FIXED_TIMESTEP)
{
// Handle state-specific behavior with fixed timestep
switch (m_state)
{
case PlayerState::STANDING:
HandleStanding();
break;
case PlayerState::JUMPING:
HandleJumping();
break;
case PlayerState::FALLING:
HandleFalling();
break;
case PlayerState::LANDING:
HandleLanding();
break;
default:
break;
}
// Check if player should be falling
if (isPlayerInAir() && m_state != PlayerState::JUMPING && m_state != PlayerState::FALLING)
{
SetState(PlayerState::FALLING);
std::cout << "Transitioning to FALLING state in Update." << std::endl;
}
// Apply physics when in air
if (isPlayerInAir())
{
ApplyGravity();
ApplyAirResistance();
HandleAirCollisions();
}
// Update position
UpdatePosition();
accumulator -= FIXED_TIMESTEP;
}
}
bool Player::isPlayerInAir()
{
glm::vec3 raycastOrigin = GetPosition() + glm::vec3(0.0f, 0.05f, 0.0f);
glm::vec3 downDirection(0.0f, -1.0f, 0.0f);
auto fallResult = m_world->PlayerBoxRaycast(raycastOrigin, downDirection,
1000.0f, m_playerDimensions, GetRotation());
return !fallResult.hit || fallResult.distance > m_groundThreshold;
}
void Player::HandleAirCollisions()
{
const int numRayChecks = 3;
float heightIntervals[] = { 0.2f, 0.5f, 0.8f }; // Check bottom, middle, and top
// Get forward movement direction
glm::vec3 forwardDir = glm::normalize(glm::vec3(m_moveSpeed.x, 0.0f, m_moveSpeed.z));
if (glm::length2(forwardDir) < 0.001f) return;
float collisionDistance = m_playerDimensions.x * 0.5f;
// Check collisions at different heights
for (int i = 0; i < numRayChecks; i++)
{
glm::vec3 rayOrigin = GetPosition() +
glm::vec3(0.0f, m_playerDimensions.y * heightIntervals[i], 0.0f);
auto collisionResult = m_world->PlayerBoxRaycast(rayOrigin, forwardDir,
collisionDistance, m_playerDimensions, GetRotation());
if (collisionResult.hit && collisionResult.distance <= collisionDistance)
{
std::cout << "Collision detected at height " << heightIntervals[i] << std::endl;
// Stop horizontal movement
m_moveSpeed.x = 0.0f;
m_moveSpeed.z = 0.0f;
// Calculate push-back distance
float pushBackDist = collisionDistance - collisionResult.distance + 0.01f;
// Apply push-back
glm::vec3 currentPos = GetPosition();
glm::vec3 pushBack = -forwardDir * pushBackDist;
pushBack.y = 0.0f;
SetPosition(currentPos + pushBack);
return; // Exit after handling first collision
}
}
}
void Player::UpdatePosition()
{
glm::vec3 proposedMove = m_moveSpeed * FIXED_TIMESTEP;
glm::vec3 newPosition = GetPosition();
// Apply horizontal movement
newPosition.x += proposedMove.x;
newPosition.z += proposedMove.z;
// Check for horizontal collision at new position
glm::vec3 moveDir = glm::normalize(glm::vec3(proposedMove.x, 0.0f, proposedMove.z));
if (glm::length2(moveDir) > 0.001f)
{
glm::vec3 checkPos = newPosition + glm::vec3(0.0f, m_playerDimensions.y * 0.5f, 0.0f);
auto collisionCheck = m_world->PlayerBoxRaycast(checkPos, moveDir,
m_playerDimensions.x * 0.5f, m_playerDimensions, GetRotation());
if (collisionCheck.hit)
{
// Revert to previous horizontal position
newPosition.x = GetPosition().x;
newPosition.z = GetPosition().z;
}
}
// Apply vertical movement
newPosition.y += proposedMove.y;
SetPosition(newPosition);
m_MoveSpeedPerTick = GetPosition() - m_PreviousPosition;
m_PreviousPosition = GetPosition();
}
glm::vec3 Player::GetGroundPos()
{
glm::vec3 playerPosition = GetPosition();
glm::quat playerRotation = GetRotation();
glm::vec3 downDirection(0.0f, -1.0f, 0.0f);
float maxFallDistance = 1000.0f;
glm::vec3 raycastOrigin = playerPosition + glm::vec3(0.0f, m_groundThreshold, 0.0f);
auto fallResult = m_world->PlayerBoxRaycast(raycastOrigin, downDirection,
maxFallDistance, m_playerDimensions, playerRotation);
if (fallResult.hit)
{
return fallResult.hitPoint;
}
return { 9999.0f, 9999.0f, 9999.0f };
}
void Player::ApplyGravity()
{
// Apply gravity as 0.008f per frame
m_moveSpeed.y -= 0.008f;
}
void Player::ApplyAirResistance()
{
// Adjust air resistance for fixed timestep
if (m_fAirResistance > 0.1f) {
float f = powf(m_fAirResistance, FIXED_TIMESTEP);
m_moveSpeed *= f;
}
else {
float magnitudeSqr = glm::length2(m_moveSpeed);
float f = powf(1.0f / abs(m_fAirResistance * 0.5f * magnitudeSqr + 1.0f), FIXED_TIMESTEP);
m_moveSpeed *= f;
}
}
void Player::ApplyMoveForce(glm::vec3 force)
{
// Applying force based on fixed timestep
m_moveSpeed += force * (1.0f / 70.0f);
}
void Player::Jump()
{
if (m_state != PlayerState::STANDING && m_state != PlayerState::LANDING)
return;
SetState(PlayerState::JUMPING);
std::cout << "Player started jumping." << std::endl;
// Jump parameters
const float maxHeight = 1.0f;
const float jumpDistance = 4.5f;
const float g = 9.81f;
// Calculate velocities
float v0y = std::sqrt(2.0f * g * maxHeight);
float t_total = (2.0f * v0y) / g;
float v0z = jumpDistance / t_total;
// Get forward direction
glm::vec3 forwardDir = GetRotation() * glm::vec3(0.0f, 0.0f, 1.0f);
forwardDir = glm::normalize(glm::vec3(forwardDir.x, 0.0f, forwardDir.z));
// Set velocities
m_moveSpeed = glm::vec3(
forwardDir.x * v0z,
v0y,
forwardDir.z * v0z
);
}
void Player::HandleStanding()
{
// Implement standing behavior if needed
}
void Player::HandleFalling()
{
glm::vec3 groundPos = GetGroundPos();
float dist = glm::distance(groundPos, GetPosition());
if (dist >= 2000.0f)
{
std::cout << "Player is below the map! Resetting position." << std::endl;
m_moveSpeed = glm::vec3(0.0f);
SetPosition({ -15.3375f, 17.5399f, 69.3102f }); // Reset position
return;
}
if (dist <= m_groundThreshold)
{
m_moveSpeed = glm::vec3(0.0f);
// Only adjust Y position to ground level
glm::vec3 newPos = GetPosition();
newPos.y = groundPos.y;
SetPosition(newPos);
SetState(PlayerState::LANDING);
std::cout << "Player has landed." << std::endl;
}
}
void Player::HandleJumping()
{
// Check if the player has reached the peak of the jump
if (m_moveSpeed.y <= 0.0f)
{
// Transition to FALLING state
SetState(PlayerState::FALLING);
std::cout << "Player is now falling." << std::endl;
}
}
void Player::HandleLanding()
{
SetState(PlayerState::STANDING);
std::cout << "Player is now standing." << std::endl;
}
```
### 5. Final Notes
- **Testing:** After implementing these changes, thoroughly test the physics to ensure that the player's movement, jumping, falling, and collision behaviors are consistent and behave as expected at 30 FPS.
- **Performance:** Fixed timestep logic can simplify debugging and ensure consistent physics across different hardware, but ensure that your main loop efficiently handles the fixed updates without introducing unnecessary delays.
- **Extensibility:** If you plan to support variable frame rates in the future, consider implementing a more flexible timestep management system that can accommodate both fixed and variable timesteps.
By following these modifications, your physics implementation should now operate using a fixed 30 FPS emulation, with gravity and other physics forces applied consistently per frame.