bool OctreeQueryNode::updateCurrentViewFrustum() {
// if shutting down, return immediately
if (_isShuttingDown) {
return false;
}
bool currentViewFrustumChanged = false;
ViewFrustum newestViewFrustum;
// get position and orientation details from the camera
newestViewFrustum.setPosition(getCameraPosition());
newestViewFrustum.setOrientation(getCameraOrientation());
// Also make sure it's got the correct lens details from the camera
float originalFOV = getCameraFov();
float wideFOV = originalFOV + VIEW_FRUSTUM_FOV_OVERSEND;
newestViewFrustum.setFieldOfView(wideFOV); // hack
newestViewFrustum.setAspectRatio(getCameraAspectRatio());
newestViewFrustum.setNearClip(getCameraNearClip());
newestViewFrustum.setFarClip(getCameraFarClip());
newestViewFrustum.setEyeOffsetPosition(getCameraEyeOffsetPosition());
// if there has been a change, then recalculate
if (!newestViewFrustum.isVerySimilar(_currentViewFrustum)) {
_currentViewFrustum = newestViewFrustum;
_currentViewFrustum.calculate();
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;
}
QString LODManager::getLODFeedbackText() {
// determine granularity feedback
int boundaryLevelAdjust = getBoundaryLevelAdjust();
QString granularityFeedback;
switch (boundaryLevelAdjust) {
case 0: {
granularityFeedback = QString(".");
} break;
case 1: {
granularityFeedback = QString(" at half of standard granularity.");
} break;
case 2: {
granularityFeedback = QString(" at a third of standard granularity.");
} break;
default: {
granularityFeedback = QString(" at 1/%1th of standard granularity.").arg(boundaryLevelAdjust + 1);
} break;
}
// distance feedback
float octreeSizeScale = getOctreeSizeScale();
float relativeToDefault = octreeSizeScale / DEFAULT_OCTREE_SIZE_SCALE;
int relativeToTwentyTwenty = 20 / relativeToDefault;
QString result;
if (relativeToDefault > 1.01f) {
result = QString("20:%1 or %2 times further than average vision%3").arg(relativeToTwentyTwenty).arg(relativeToDefault,0,'f',2).arg(granularityFeedback);
} else if (relativeToDefault > 0.99f) {
result = QString("20:20 or the default distance for average vision%1").arg(granularityFeedback);
} else if (relativeToDefault > 0.01f) {
result = QString("20:%1 or %2 of default distance for average vision%3").arg(relativeToTwentyTwenty).arg(relativeToDefault,0,'f',3).arg(granularityFeedback);
} else {
result = QString("%2 of default distance for average vision%3").arg(relativeToDefault,0,'f',3).arg(granularityFeedback);
}
return result;
}
// TODO: This is essentially the same logic used to render octree cells, but since models are more detailed then octree cells
// I've added a voxelToModelRatio that adjusts how much closer to a model you have to be to see it.
bool LODManager::shouldRenderMesh(float largestDimension, float distanceToCamera) {
const float octreeToMeshRatio = 4.0f; // must be this many times closer to a mesh than a voxel to see it.
float octreeSizeScale = getOctreeSizeScale();
int boundaryLevelAdjust = getBoundaryLevelAdjust();
float maxScale = (float)TREE_SCALE;
float visibleDistanceAtMaxScale = boundaryDistanceForRenderLevel(boundaryLevelAdjust, octreeSizeScale) / octreeToMeshRatio;
if (_shouldRenderTableNeedsRebuilding) {
_shouldRenderTable.clear();
float SMALLEST_SCALE_IN_TABLE = 0.001f; // 1mm is plenty small
float scale = maxScale;
float visibleDistanceAtScale = visibleDistanceAtMaxScale;
while (scale > SMALLEST_SCALE_IN_TABLE) {
scale /= 2.0f;
visibleDistanceAtScale /= 2.0f;
_shouldRenderTable[scale] = visibleDistanceAtScale;
}
_shouldRenderTableNeedsRebuilding = false;
}
float closestScale = maxScale;
float visibleDistanceAtClosestScale = visibleDistanceAtMaxScale;
QMap<float, float>::const_iterator lowerBound = _shouldRenderTable.lowerBound(largestDimension);
if (lowerBound != _shouldRenderTable.constEnd()) {
closestScale = lowerBound.key();
visibleDistanceAtClosestScale = lowerBound.value();
}
if (closestScale < largestDimension) {
visibleDistanceAtClosestScale *= 2.0f;
}
return (distanceToCamera <= visibleDistanceAtClosestScale);
}
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;
}
}
