void showIndicator( bool show )
{
assert(mIndicatorSceneNode);
assert( mCurrentLightEntity && mDirectionalLightEntity );
// 如果是方向光
if ( mCurrentLightEntity == mDirectionalLightEntity )
{
mIndicatorSceneNode->setVisible(show);
mIndicatorSceneNode->showBoundingBox(false);
// 获取到摄像机与地形的交点
Ogre::Vector3 pos;
Ogre::Ray cameraRay( mSceneManipulator->getCamera()->getPosition(), mSceneManipulator->getCamera()->getDirection() );
bool hit = mSceneManipulator->getTerrainIntersects(cameraRay, pos);
if (hit)
{
// 在地形上的一米处出现光源指示器
float height = mSceneManipulator->getTerrainData()->getHeightAt(pos.x, pos.z) + 100.0f;
mIndicatorSceneNode->setPosition(pos.x, height, pos.z);
}
}
else
{
mIndicatorSceneNode->showBoundingBox(show);
}
}
//-------------------------------------------------------------------------------------
bool App::frameRenderingQueued(const Ogre::FrameEvent& evt)
{
if(mWindow->isClosed())
return false;
if(mShutDown)
return false;
//Need to capture/update each device
mKeyboard->capture();
mMouse->capture();
//Need to inject timestamps to CEGUI System.
CEGUI::System::getSingleton().injectTimePulse(evt.timeSinceLastFrame);
//---- handle terrain collisions
//raycast to the ground from the camera
Ogre::Vector3 camPos = mCamera->getPosition();
Ogre::Ray cameraRay(Ogre::Vector3(camPos.x, 5000.0f, camPos.z), Ogre::Vector3::NEGATIVE_UNIT_Y);
mRaySceneQuery->setRay(cameraRay);
Ogre::RaySceneQueryResult &result = mRaySceneQuery->execute();
Ogre::RaySceneQueryResult::iterator itr = result.begin();
//tell the player about the ground height
if (itr != result.end() && itr->worldFragment)
{
m_pPlayerEntity->SetGroundHeight(itr->worldFragment->singleIntersection.y);
}
//
return true;
}
Ray Camera::GenerateRay(vec2 sample) {
vec3 w = normalize(eyeinit - center);
vec3 u = cross(upinit, w);
u = normalize(u);
vec3 v = cross(w, u);
float alpha, beta;
beta = tan(fovy / 2) * (Height / 2 - sample.y) / (Height / 2);
alpha = tan(fovy / 2) * (sample.x - (Width / 2)) / (Width / 2) * Width / Height;
Ray cameraRay(eyeinit, normalize(alpha * u - beta * v - w));
return cameraRay;
}
void StandardModelIndicator::_setHitPoint(Real x, Real y)
{
Ogre::Vector3 position;
Ogre::Ray cameraRay( getCamera()->getPosition(), getCamera()->getDirection() );
bool hit = getSceneManipulator()->getTerrainIntersects(cameraRay, position);
mIntersectNode->setVisible(hit);
if (hit)
{
mIntersectNode->setPosition(position);
}
}
bool AvatarTerrainCursor::getTerrainCursorPosition(const Ogre::Vector3** position)
{
bool shouldRecalculate = false;
bool updated = false;
//first check if the mouse has moved even one pixel, and if so force an update
const MousePosition& mousePosition(Input::getSingleton().getMousePosition());
if (mousePosition.xPixelPosition != mLastMouseX || mousePosition.yPixelPosition != mLastMouseY) {
shouldRecalculate = true;
} else {
//the mouse hasn't moved, perhaps the camera has?
if (mLastCameraPosition != mCamera.getDerivedPosition() || mLastCameraOrientation != mCamera.getDerivedOrientation()) {
//ok, the camera has moved, but has enough time elapsed since our last update to warrant a new update?
long long now = Time::currentTimeMillis();
long long delta = now - mLastUpdated;
// if enough time has lapsed, we'll update, otherwise we return the last known position
if( delta > mUpdatePositionThreshold )
{
shouldRecalculate = true;
}
}
}
if(shouldRecalculate)
{
// mark update time
mLastUpdated = Time::currentTimeMillis();
mLastMouseX = mousePosition.xPixelPosition;
mLastMouseY = mousePosition.yPixelPosition;
mLastCameraPosition = mCamera.getDerivedPosition();
mLastCameraOrientation = mCamera.getDerivedOrientation();
// Check if camera ray intersects terrain
Ogre::Ray cameraRay(mCamera.getCameraToViewportRay(mousePosition.xRelativePosition, mousePosition.yRelativePosition));
std::pair<bool, Ogre::Vector3> intersectResult = mTerrainAdapter.rayIntersects(cameraRay);
if (intersectResult.first) {
mLastTerrainPosition = intersectResult.second;
updated = true;
}
// S_LOG_VERBOSE("getTerrainCursorPosition : Update ("<< mLastMouseX << "," << mLastMouseY << ")->" << Ogre::StringConverter::toString(mLastTerrainPosition));
}
*position = &mLastTerrainPosition;
// S_LOG_VERBOSE("getTerrainCursorPosition : return");
return updated;
}
void CharacterGame::fixCamera(long elapsedTime)
{
static float cameraOffset = 0.0f;
#define RAY_STEP_SIZE 0.1f
Node* node = _scene->getActiveCamera()->getNode();
Vector3 cameraForward = node->getForwardVectorWorld();
cameraForward.normalize();
Vector3 cameraPosition = node->getTranslationWorld();
Vector3 focalPoint = cameraPosition + (cameraForward * CAMERA_FOCUS_RANGE);
Ray cameraRay(cameraPosition, cameraPosition - focalPoint);
float d = cameraRay.getOrigin().distanceSquared(focalPoint);
Vector3 collisionPoint;
PhysicsCollisionObject* cameraOcclusion = Game::getInstance()->getPhysicsController()->rayTest(cameraRay, CAMERA_FOCUS_RANGE, &collisionPoint);
bool cameraCollision = false;
if (cameraOcclusion)
{
Vector3 rayStep = cameraRay.getDirection() * RAY_STEP_SIZE;
do
{
float d2 = cameraRay.getOrigin().distanceSquared(collisionPoint);
if (d2 > d)
break; // collision point is past the character (not obstructing the view)
cameraCollision = true;
// Step along the camera ray closer to the character
cameraRay.setOrigin(cameraRay.getOrigin() - rayStep);
// Prevent camera from moving past character
if (cameraRay.getOrigin().distanceSquared(focalPoint) < (RAY_STEP_SIZE*RAY_STEP_SIZE))
break;
}
while ((cameraOcclusion = Game::getInstance()->getPhysicsController()->rayTest(cameraRay, CAMERA_FOCUS_RANGE, &collisionPoint)));
}
if (cameraCollision)
{
// Move camera
float moveDistance = cameraPosition.distance(cameraRay.getOrigin());
//node->setTranslation(0, 0, 0);
node->translateForward(moveDistance);
cameraOffset += moveDistance;
}
else
{
// Reset camera
if (cameraOffset != 0.0f)
{
node->translateForward(-cameraOffset);
cameraOffset = 0.0f;
// Call updateCamera again to ensure that moving back didn't cause a different
// object to obstruct the view.
fixCamera(elapsedTime);
}
}
}