Adding density to nodes

libraries/voxels/src/VoxelNode.cpp

@@ -35,7 +35,7 @@ void VoxelNode::init(unsigned char * octalCode) {
     _currentColor[0] = _currentColor[1] = _currentColor[2] = _currentColor[3] = 0;
 #endif
     _trueColor[0] = _trueColor[1] = _trueColor[2] = _trueColor[3] = 0;
-
+    _density = 0.0f;
     
     // default pointers to child nodes to NULL
     for (int i = 0; i < NUMBER_OF_CHILDREN; i++) {
@@ -165,6 +165,7 @@ void VoxelNode::safeDeepDeleteChildAtIndex(int childIndex, bool& stagedForDeleti
 // will average the child colors...
 void VoxelNode::setColorFromAverageOfChildren() {
     int colorArray[4] = {0,0,0,0};
+    float density = 0.0f;
     for (int i = 0; i < NUMBER_OF_CHILDREN; i++) {
         if (_children[i] && !_children[i]->isStagedForDeletion() && _children[i]->isColored()) {
             for (int j = 0; j < 3; j++) {
@@ -172,11 +173,27 @@ void VoxelNode::setColorFromAverageOfChildren() {
             }
             colorArray[3]++;
         }
+        if (_children[i]) {
+            density += _children[i]->getDensity();
+        }
     }
+    if (_childCount > 0) {
+        //  If there are children, density is sum of child densities
+        density /= (float) NUMBER_OF_CHILDREN;
+    } else {
+        //  If there are no children
+        density = 1.f;
+    }
+    
+    if (colorArray[3] > 0) {
+        printf("children: %d, density = %4.2f\n", colorArray[3], density);
+    }
+    
+    const float VISIBLE_ABOVE_DENSITY = 0.0f;
     nodeColor newColor = { 0, 0, 0, 0};
-    if (colorArray[3] > 4) {
-        // we need at least 4 colored children to have an average color value
-        // or if we have none we generate random values
+    //  if (density > VISIBLE_ABOVE_DENSITY) {
+    if (colorArray[3] > 0) {
+        // The density of material in the space of the voxel sets whether it is actually colored
         for (int c = 0; c < 3; c++) {
             // set the average color value
             newColor[c] = colorArray[c] / colorArray[3];
@@ -188,6 +205,7 @@ void VoxelNode::setColorFromAverageOfChildren() {
     // this will be the default value all zeros, and therefore be marked as
     // transparent with a 4th element of 0
     setColor(newColor);
+    setDensity(density);
 }
 
 // Note: !NO_FALSE_COLOR implementations of setFalseColor(), setFalseColored(), and setColor() here.

libraries/voxels/src/VoxelNode.h

@@ -36,6 +36,7 @@ private:
     unsigned char* _octalCode;
     VoxelNode* _children[8];
     int _childCount;
+    float _density;             // If leaf: density = 1, if internal node: 0-1 density of voxels inside
 
     void calculateAABox();
 
@@ -102,11 +103,14 @@ public:
     void setColor(const nodeColor& color);
     const nodeColor& getTrueColor() const { return _trueColor; };
     const nodeColor& getColor() const { return _currentColor; };
+    void setDensity(const float density) { _density = density; };
+    const float getDensity() const { return _density; };
 #else
     void setFalseColor(colorPart red, colorPart green, colorPart blue) { /* no op */ };
     void setFalseColored(bool isFalseColored) { /* no op */ };
     bool getFalseColored() { return false; };
     void setColor(const nodeColor& color) { memcpy(_trueColor,color,sizeof(nodeColor)); };
+    void setDensity(const float density) { _density = density; };
     const nodeColor& getTrueColor() const { return _trueColor; };
     const nodeColor& getColor() const { return _trueColor; };
 #endif

voxel-server/src/main.cpp

@@ -387,16 +387,6 @@ void persistVoxelsWhenDirty() {
 
     // check the dirty bit and persist here...
     if (::wantVoxelPersist && ::serverTree.isDirty() && sinceLastTime > VOXEL_PERSIST_INTERVAL) {
-
-        {
-            PerformanceWarning warn(::shouldShowAnimationDebug, 
-                                    "persistVoxelsWhenDirty() - reaverageVoxelColors()", ::shouldShowAnimationDebug);
-
-            // after done inserting all these voxels, then reaverage colors
-            serverTree.reaverageVoxelColors(serverTree.rootNode);
-        }
-
-
         {
             PerformanceWarning warn(::shouldShowAnimationDebug, 
                                     "persistVoxelsWhenDirty() - writeToSVOFile()", ::shouldShowAnimationDebug);
@@ -506,6 +496,15 @@ int main(int argc, const char * argv[]) {
     if (::wantVoxelPersist) {
         printf("loading voxels from file...\n");
         persistantFileRead = ::serverTree.readFromSVOFile(::wantLocalDomain ? LOCAL_VOXELS_PERSIST_FILE : VOXELS_PERSIST_FILE);
+        if (persistantFileRead) {
+            PerformanceWarning warn(::shouldShowAnimationDebug,
+                                    "persistVoxelsWhenDirty() - reaverageVoxelColors()", ::shouldShowAnimationDebug);
+            
+            // after done inserting all these voxels, then reaverage colors
+            serverTree.reaverageVoxelColors(serverTree.rootNode);
+            printf("Voxels reAveraged\n");
+        }
+        
         ::serverTree.clearDirtyBit(); // the tree is clean since we just loaded it
         printf("DONE loading voxels from file... fileRead=%s\n", debug::valueOf(persistantFileRead));
         unsigned long nodeCount = ::serverTree.getVoxelCount();