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build a cached lookup table for the shouldRenderMesh() LOD method

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This commit is contained in:
ZappoMan 2014-10-16 01:00:32 -07:00
parent bf77adc4bc
commit d238d06df5
2 changed files with 38 additions and 15 deletions
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48
interface/src/Menu.cpp
View file

@ -122,7 +122,8 @@ Menu::Menu() :
_hasLoginDialogDisplayed(false),
_snapshotsLocation(),
_scriptsLocation(),
_walletPrivateKey()
_walletPrivateKey(),
_shouldRenderTableNeedsRebuilding(true)
{
Application *appInstance = Application::getInstance();
@ -1551,6 +1552,7 @@ void Menu::autoAdjustLOD(float currentFPS) {
&& _voxelSizeScale > ADJUST_LOD_MIN_SIZE_SCALE) {
_voxelSizeScale *= ADJUST_LOD_DOWN_BY;
if (_voxelSizeScale < ADJUST_LOD_MIN_SIZE_SCALE) {
_voxelSizeScale = ADJUST_LOD_MIN_SIZE_SCALE;
}
@ -1573,6 +1575,7 @@ void Menu::autoAdjustLOD(float currentFPS) {
}
if (changed) {
_shouldRenderTableNeedsRebuilding = true;
if (_lodToolsDialog) {
_lodToolsDialog->reloadSliders();
}
@ -1587,36 +1590,53 @@ void Menu::resetLODAdjust() {
void Menu::setVoxelSizeScale(float sizeScale) {
_voxelSizeScale = sizeScale;
_shouldRenderTableNeedsRebuilding = true;
bumpSettings();
}
void Menu::setBoundaryLevelAdjust(int boundaryLevelAdjust) {
_boundaryLevelAdjust = boundaryLevelAdjust;
_shouldRenderTableNeedsRebuilding = true;
bumpSettings();
}
// TODO: This could be optimized to be a table, or something that doesn't require recalculation on every
// render call for every entity
// TODO: This is essentially the same logic used to render voxels, but since models are more detailed then voxels
// I've added a voxelToModelRatio that adjusts how much closer to a model you have to be to see it.
bool Menu::shouldRenderMesh(float largestDimension, float distanceToCamera) const {
bool Menu::shouldRenderMesh(float largestDimension, float distanceToCamera) {
const float voxelToMeshRatio = 4.0f; // must be this many times closer to a mesh than a voxel to see it.
float voxelSizeScale = getVoxelSizeScale();
int boundaryLevelAdjust = getBoundaryLevelAdjust();
float maxScale = (float)TREE_SCALE;
float visibleDistanceAtMaxScale = boundaryDistanceForRenderLevel(boundaryLevelAdjust, voxelSizeScale) / voxelToMeshRatio;
float scale = (float)TREE_SCALE;
float visibleDistanceAtScale = boundaryDistanceForRenderLevel(boundaryLevelAdjust, voxelSizeScale) / voxelToMeshRatio;
if (_shouldRenderTableNeedsRebuilding) {
_shouldRenderTable.clear();
while (scale > largestDimension) {
scale /= 2.0f;
visibleDistanceAtScale /= 2.0f;
}
if (scale < largestDimension) {
visibleDistanceAtScale *= 2.0f;
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;
}
return (distanceToCamera <= visibleDistanceAtScale);
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);
}

5
interface/src/Menu.h
View file

@ -143,7 +143,7 @@ public:
void setBoundaryLevelAdjust(int boundaryLevelAdjust);
int getBoundaryLevelAdjust() const { return _boundaryLevelAdjust; }
bool shouldRenderMesh(float largestDimension, float distanceToCamera) const;
bool shouldRenderMesh(float largestDimension, float distanceToCamera);
#ifdef Q_OS_MAC
SpeechRecognizer* getSpeechRecognizer() { return &_speechRecognizer; }
@ -312,6 +312,9 @@ private:
QString _snapshotsLocation;
QString _scriptsLocation;
QByteArray _walletPrivateKey;
bool _shouldRenderTableNeedsRebuilding;
QMap<float, float> _shouldRenderTable;
};