float OctreeElement::distanceToCamera(const ViewFrustum& viewFrustum) const {
glm::vec3 center = _cube.calcCenter();
glm::vec3 temp = viewFrustum.getPosition() - center;
float distanceToVoxelCenter = sqrtf(glm::dot(temp, temp));
return distanceToVoxelCenter;
}
ViewFrustum::location OctreeElement::inFrustum(const ViewFrustum& viewFrustum) const {
return viewFrustum.cubeInFrustum(_cube);
}
// Calculates the distance to the furthest point of the voxel to the camera
// does as much math as possible in voxel scale and then scales up to TREE_SCALE at end
float OctreeElement::furthestDistanceToCamera(const ViewFrustum& viewFrustum) const {
glm::vec3 furthestPoint;
viewFrustum.getFurthestPointFromCamera(_cube, furthestPoint);
glm::vec3 temp = viewFrustum.getPosition() - furthestPoint;
return sqrtf(glm::dot(temp, temp));
}
bool OctreeQueryNode::updateCurrentViewFrustum() {
// if shutting down, return immediately
if (_isShuttingDown) {
return false;
}
if (!_usesFrustum) {
// this client does not use a view frustum so the view frustum for this query has not changed
return false;
} else {
bool currentViewFrustumChanged = false;
ViewFrustum newestViewFrustum;
// get position and orientation details from the camera
newestViewFrustum.setPosition(getCameraPosition());
newestViewFrustum.setOrientation(getCameraOrientation());
newestViewFrustum.setCenterRadius(getCameraCenterRadius());
// Also make sure it's got the correct lens details from the camera
float originalFOV = getCameraFov();
float wideFOV = originalFOV + VIEW_FRUSTUM_FOV_OVERSEND;
if (0.0f != getCameraAspectRatio() &&
0.0f != getCameraNearClip() &&
0.0f != getCameraFarClip() &&
getCameraNearClip() != getCameraFarClip()) {
newestViewFrustum.setProjection(glm::perspective(
glm::radians(wideFOV), // hack
getCameraAspectRatio(),
getCameraNearClip(),
getCameraFarClip()));
newestViewFrustum.calculate();
}
{ // if there has been a change, then recalculate
QMutexLocker viewLocker(&_viewMutex);
if (!newestViewFrustum.isVerySimilar(_currentViewFrustum)) {
_currentViewFrustum = newestViewFrustum;
currentViewFrustumChanged = true;
}
}
// Also check for LOD changes from the client
if (_lodInitialized) {
if (_lastClientBoundaryLevelAdjust != getBoundaryLevelAdjust()) {
_lastClientBoundaryLevelAdjust = getBoundaryLevelAdjust();
_lodChanged = true;
}
if (_lastClientOctreeSizeScale != getOctreeSizeScale()) {
_lastClientOctreeSizeScale = getOctreeSizeScale();
_lodChanged = true;
}
} else {
_lodInitialized = true;
_lastClientOctreeSizeScale = getOctreeSizeScale();
_lastClientBoundaryLevelAdjust = getBoundaryLevelAdjust();
_lodChanged = false;
}
// When we first detect that the view stopped changing, we record this.
// but we don't change it back to false until we've completely sent this
// scene.
if (_viewFrustumChanging && !currentViewFrustumChanged) {
_viewFrustumJustStoppedChanging = true;
}
_viewFrustumChanging = currentViewFrustumChanged;
return currentViewFrustumChanged;
}
}
