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Prevent toppling over

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This commit is contained in:
Flakebi 2015-03-24 02:21:12 +01:00
parent 060bf2a2cf
commit 0501e35d95
1 changed files with 29 additions and 15 deletions
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44
src/graphics/camera.cpp
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@ -121,25 +121,36 @@ Camera::~Camera()
*/ */
void Camera::applyMouseMovement (float x, float y) void Camera::applyMouseMovement (float x, float y)
{ {
core::vector3df direction(m_target_direction); vector3df direction(m_target_direction);
core::vector3df up(m_camera->getUpVector()); vector3df up(m_camera->getUpVector());
// Set local values if the camera is attached to the kart // Set local values if the camera is attached to the kart
if (m_attached) if (m_attached)
up = m_local_up; up = m_local_up;
core::vector3df side(direction.crossProduct(up));
direction.normalize(); direction.normalize();
up.normalize(); up.normalize();
core::quaternion quat;
quat.fromAngleAxis(x, up);
core::quaternion quat_y; vector3df side(direction.crossProduct(up));
quat_y.fromAngleAxis(y, side); side.normalize();
quat *= quat_y; core::quaternion quat;
quat.fromAngleAxis(y, side);
core::quaternion quat_x;
quat_x.fromAngleAxis(x, up);
quat *= quat_x;
direction = quat * direction; direction = quat * direction;
// Try to prevent toppling over
// If the camera would topple over with the next movement, the vertical
// movement gets reset close to the up vector
if ((direction - up).getLengthSQ() + (m_target_direction - up).getLengthSQ()
<= (direction - m_target_direction).getLengthSQ())
direction = quat_x * ((m_target_direction - up).setLength(0.02f) + up);
// Prevent toppling under
else if ((direction + up).getLengthSQ() + (m_target_direction + up).getLengthSQ()
<= (direction - m_target_direction).getLengthSQ())
direction = quat_x * ((m_target_direction + up).setLength(0.02f) - up);
m_target_direction = direction; m_target_direction = direction;
// Don't do that because it looks ugly and is bad to handle ;) // Don't do that because it looks ugly and is bad to handle ;)
@ -534,10 +545,10 @@ void Camera::update(float dt)
// Update the first person camera // Update the first person camera
else if (UserConfigParams::m_camera_debug == 3) else if (UserConfigParams::m_camera_debug == 3)
{ {
core::vector3df direction(m_camera->getTarget() - m_camera->getPosition()); vector3df direction(m_camera->getTarget() - m_camera->getPosition());
core::vector3df up(m_camera->getUpVector()); vector3df up(m_camera->getUpVector());
core::vector3df side(direction.crossProduct(up)); vector3df side(direction.crossProduct(up));
core::vector3df pos = m_camera->getPosition(); vector3df pos = m_camera->getPosition();
// Set local values if the camera is attached to the kart // Set local values if the camera is attached to the kart
if (m_attached) if (m_attached)
@ -615,9 +626,12 @@ void Camera::update(float dt)
up.normalize(); up.normalize();
side.normalize(); side.normalize();
// Top vector is the real up vector, not the one used by the camera
vector3df top(side.crossProduct(direction));
// Move camera // Move camera
core::vector3df movement(direction * m_lin_velocity.Z + vector3df movement(direction * m_lin_velocity.Z +
up * m_lin_velocity.Y + side * m_lin_velocity.X); top * m_lin_velocity.Y + side * m_lin_velocity.X);
pos = pos + movement * dt; pos = pos + movement * dt;
if (m_attached) if (m_attached)