From c012a581a6b5f8238254ba6a28518ed53f8c3e36 Mon Sep 17 00:00:00 2001
From: Atlante45 <clement.brisset@gmail.com>
Date: Tue, 2 Jun 2015 19:26:39 +0200
Subject: [PATCH] Set shouldRender method

---
 interface/src/Application.cpp |  1 +
 interface/src/LODManager.cpp  | 41 +++++++++++++++++++++++++++++++++++
 interface/src/LODManager.h    |  3 +++
 3 files changed, 45 insertions(+)

diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index e436c25d09..83da9c1854 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -3434,6 +3434,7 @@ void Application::displaySide(RenderArgs* renderArgs, Camera& theCamera, bool se
     {
         PerformanceTimer perfTimer("EngineRun");
         render::RenderContext renderContext;
+        renderArgs->_shouldRender = LODManager::shouldRender;
         renderContext.args = renderArgs;
         _renderEngine->setRenderContext(renderContext);
 
diff --git a/interface/src/LODManager.cpp b/interface/src/LODManager.cpp
index cfc1c94995..79d49fd6f1 100644
--- a/interface/src/LODManager.cpp
+++ b/interface/src/LODManager.cpp
@@ -217,6 +217,47 @@ QString LODManager::getLODFeedbackText() {
     return result;
 }
 
+bool LODManager::shouldRender(const RenderArgs* args, const AABox& bounds) {
+    const float maxScale = (float)TREE_SCALE;
+    const float octreeToMeshRatio = 4.0f; // must be this many times closer to a mesh than a voxel to see it.
+    float octreeSizeScale = args->_sizeScale;
+    int boundaryLevelAdjust = args->_boundaryLevelAdjust;
+    float visibleDistanceAtMaxScale = boundaryDistanceForRenderLevel(boundaryLevelAdjust, octreeSizeScale) / octreeToMeshRatio;
+    float distanceToCamera = glm::length(bounds.calcCenter() - args->_viewFrustum->getPosition());
+    float largestDimension = bounds.getLargestDimension();
+    
+    static bool shouldRenderTableNeedsBuilding = true;
+    static QMap<float, float> shouldRenderTable;
+    if (shouldRenderTableNeedsBuilding) {
+        
+        float SMALLEST_SCALE_IN_TABLE = 0.001f; // 1mm is plenty small
+        float scale = maxScale;
+        float factor = 1.0f;
+        
+        while (scale > SMALLEST_SCALE_IN_TABLE) {
+            scale /= 2.0f;
+            factor /= 2.0f;
+            shouldRenderTable[scale] = factor;
+        }
+        
+        shouldRenderTableNeedsBuilding = false;
+    }
+    
+    float closestScale = maxScale;
+    float visibleDistanceAtClosestScale = visibleDistanceAtMaxScale;
+    QMap<float, float>::const_iterator lowerBound = shouldRenderTable.lowerBound(largestDimension);
+    if (lowerBound != shouldRenderTable.constEnd()) {
+        closestScale = lowerBound.key();
+        visibleDistanceAtClosestScale = visibleDistanceAtMaxScale * lowerBound.value();
+    }
+    
+    if (closestScale < largestDimension) {
+        visibleDistanceAtClosestScale *= 2.0f;
+    }
+    
+    return distanceToCamera <= visibleDistanceAtClosestScale;
+};
+
 // 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) {
diff --git a/interface/src/LODManager.h b/interface/src/LODManager.h
index 615bcec24d..98ababbda0 100644
--- a/interface/src/LODManager.h
+++ b/interface/src/LODManager.h
@@ -49,6 +49,8 @@ const float ADJUST_LOD_MAX_SIZE_SCALE = DEFAULT_OCTREE_SIZE_SCALE;
 // do. But both are still culled using the same angular size logic.
 const float AVATAR_TO_ENTITY_RATIO = 2.0f;
 
+class RenderArgs;
+class AABox;
 
 class LODManager : public QObject, public Dependency {
     Q_OBJECT
@@ -79,6 +81,7 @@ public:
     Q_INVOKABLE float getLODDecreaseFPS();
     Q_INVOKABLE float getLODIncreaseFPS();
     
+    static bool shouldRender(const RenderArgs* args, const AABox& bounds);
     bool shouldRenderMesh(float largestDimension, float distanceToCamera);
     void autoAdjustLOD(float currentFPS);