Mirrors/overte-lubosz
3
0
Fork 0
mirror of https://github.com/lubosz/overte.git synced 2025-04-26 20:15:39 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

add check to avoid divide by zero

Browse source
This commit is contained in:
Andrew Meadows 2017-05-08 10:59:15 -07:00
parent f00a3cafb6
commit 0f643b7d66
1 changed files with 27 additions and 25 deletions

52
libraries/physics/src/CharacterController.cpp
View file

@ -275,35 +275,37 @@ void CharacterController::playerStep(btCollisionWorld* collisionWorld, btScalar
// to move over the _stepPoint at target speed
float horizontalDistance = (_stepPoint - _stepPoint.dot(_currentUp) * _currentUp).length();
float horizontalTargetSpeed = (_targetVelocity - _targetVelocity.dot(_currentUp) * _currentUp).length();
float timeToStep = horizontalDistance / horizontalTargetSpeed;
float stepUpSpeed = _stepHeight / timeToStep;
if (horizontalTargetSpeed > FLT_EPSILON) {
float timeToStep = horizontalDistance / horizontalTargetSpeed;
float stepUpSpeed = _stepHeight / timeToStep;
// magically clamp stepUpSpeed to a fraction of horizontalTargetSpeed
// to prevent the avatar from moving unreasonably fast according to human eye
const float MAX_STEP_UP_SPEED = 0.65f * horizontalTargetSpeed;
if (stepUpSpeed > MAX_STEP_UP_SPEED) {
stepUpSpeed = MAX_STEP_UP_SPEED;
}
// magically clamp stepUpSpeed to a fraction of horizontalTargetSpeed
// to prevent the avatar from moving unreasonably fast according to human eye
const float MAX_STEP_UP_SPEED = 0.65f * horizontalTargetSpeed;
if (stepUpSpeed > MAX_STEP_UP_SPEED) {
stepUpSpeed = MAX_STEP_UP_SPEED;
}
// add minimum velocity to counteract gravity's displacement during one step
// Note: the 0.5 factor comes from the fact that we really want the
// average velocity contribution from gravity during the step
stepUpSpeed -= 0.5f * _gravity * timeToStep; // remember: _gravity is negative scalar
// add minimum velocity to counteract gravity's displacement during one step
// Note: the 0.5 factor comes from the fact that we really want the
// average velocity contribution from gravity during the step
stepUpSpeed -= 0.5f * _gravity * timeToStep; // remember: _gravity is negative scalar
btScalar vDotUp = velocity.dot(_currentUp);
if (vDotUp < stepUpSpeed) {
// character doesn't have enough upward velocity to cover the step so we help using a "sky hook"
// which uses micro-teleports rather than applying real velocity
// to prevent the avatar from popping up after the step is done
btTransform transform = _rigidBody->getWorldTransform();
transform.setOrigin(transform.getOrigin() + (dt * stepUpSpeed) * _currentUp);
_rigidBody->setWorldTransform(transform);
}
btScalar vDotUp = velocity.dot(_currentUp);
if (vDotUp < stepUpSpeed) {
// character doesn't have enough upward velocity to cover the step so we help using a "sky hook"
// which uses micro-teleports rather than applying real velocity
// to prevent the avatar from popping up after the step is done
btTransform transform = _rigidBody->getWorldTransform();
transform.setOrigin(transform.getOrigin() + (dt * stepUpSpeed) * _currentUp);
_rigidBody->setWorldTransform(transform);
}
// don't allow the avatar to fall downward when stepping up
// since otherwise this would tend to defeat the step-up behavior
if (vDotUp < 0.0f) {
velocity -= vDotUp * _currentUp;
// don't allow the avatar to fall downward when stepping up
// since otherwise this would tend to defeat the step-up behavior
if (vDotUp < 0.0f) {
velocity -= vDotUp * _currentUp;
}
}
}
_rigidBody->setLinearVelocity(velocity + _parentVelocity);