Merge pull request #3134 from wdings23/light_and_haze

Added local lights to avatar. Added haze to voxel.

examples/avatarLocalLight.js

@@ -0,0 +1,126 @@
+//
+//  avatarLocalLight.js
+//
+//  Created by Tony Peng on July 2nd, 2014
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  Set the local light direction and color on the avatar
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+var localLightDirections = [ {x: 1.0, y:0.0, z: 0.0}, {x: 0.0, y:1.0, z: 1.0}, {x: 0.0, y:0.0, z: 1.0}, {x: 1.0, y:1.0, z: 1.0}  ];
+var localLightColors = [ {x: 0.0, y:0.0, z: 0.0}, {x: 0.0, y:0.0, z: 0.0}, {x: 0.0, y:0.0, z: 0.0}, {x: 0.0, y:0.0, z: 0.0} ];
+
+var currentSelection = 0;
+var currentNumLights = 1;
+var maxNumLights = 2;
+
+function keyPressEvent(event) {
+
+    var choice = parseInt(event.text);
+    
+    if (event.text == "1") {
+    	currentSelection = 0;
+    	print("light election = " + currentSelection);
+    }
+    else if (event.text == "2" ) {
+    	currentSelection = 1;
+    	print("light selection = " + currentSelection);
+    }
+    else if (event.text == "3" ) {
+    	currentSelection = 2;
+    	print("light selection = " + currentSelection);
+    }
+    else if (event.text == "4" ) {
+    	currentSelection = 3;
+    	print("light selection = " + currentSelection);
+    }
+    else if (event.text == "5" ) {
+    	localLightColors[currentSelection].x += 0.01;
+    	if ( localLightColors[currentSelection].x > 1.0) {
+    		localLightColors[currentSelection].x = 0.0;
+    	}
+    	
+    	MyAvatar.setLocalLightColor(localLightColors[currentSelection], currentSelection);
+    }
+    else if (event.text == "6" ) {
+    	localLightColors[currentSelection].y += 0.01;
+    	if ( localLightColors[currentSelection].y > 1.0) {
+    		localLightColors[currentSelection].y = 0.0;
+    	}
+    	
+    	MyAvatar.setLocalLightColor(localLightColors[currentSelection], currentSelection);
+    }
+    else if (event.text == "7" ) {
+    	localLightColors[currentSelection].z += 0.01;
+    	if ( localLightColors[currentSelection].z > 1.0) {
+    		localLightColors[currentSelection].z = 0.0;
+    	}
+    	
+    	MyAvatar.setLocalLightColor(localLightColors[currentSelection], currentSelection);
+    }
+    else if (event.text == "8" ) {
+    	localLightDirections[currentSelection].x += 0.01;
+    	if (localLightDirections[currentSelection].x > 1.0) {
+    		localLightDirections[currentSelection].x = -1.0;
+    	}
+    	
+    	MyAvatar.setLocalLightDirection(localLightDirections[currentSelection], currentSelection);
+    }
+    else if (event.text == "9" ) {
+    	localLightDirections[currentSelection].x -= 0.01;
+    	if (localLightDirections[currentSelection].x < -1.0) {
+    		localLightDirections[currentSelection].x = 1.0;
+    	}
+    	
+    	MyAvatar.setLocalLightDirection(localLightDirections[currentSelection], currentSelection);
+    }
+    else if (event.text == "[" ) {
+    	localLightDirections[currentSelection].y += 0.01;
+    	if (localLightDirections[currentSelection].y > 1.0) {
+    		localLightDirections[currentSelection].y = -1.0;
+    	}
+    	
+    	MyAvatar.setLocalLightDirection(localLightDirections[currentSelection], currentSelection);
+    }
+    else if (event.text == "]" ) {
+    	localLightDirections[currentSelection].y -= 0.01;
+    	if (localLightDirections[currentSelection].y < -1.0) {
+    		localLightDirections[currentSelection].y = 1.0;
+    	}
+    	
+    	MyAvatar.setLocalLightDirection(localLightDirections[currentSelection], currentSelection);
+    }
+    else if (event.text == "," ) {
+    	if (currentNumLights + 1 <= maxNumLights) {
+            var darkGrayColor = {x:0.3, y:0.3, z:0.3};    
+
+    		// default light
+    		localLightColors[currentNumLights].x = darkGrayColor.x;
+    		localLightColors[currentNumLights].y = darkGrayColor.y;
+    		localLightColors[currentNumLights].z = darkGrayColor.z;
+    	
+            MyAvatar.addLocalLight(); 
+    		MyAvatar.setLocalLightColor(localLightColors[currentNumLights], currentNumLights);
+    		MyAvatar.setLocalLightDirection(localLightDirections[currentNumLights], currentNumLights);
+	
+    		++currentNumLights;
+    	}
+    }
+    else if (event.text == "." ) {
+    	if (currentNumLights - 1 >= 0 ) {
+    	
+    		// no light contribution
+    		localLightColors[currentNumLights - 1].x = 0.0;
+    		localLightColors[currentNumLights - 1].y = 0.0;
+    		localLightColors[currentNumLights - 1].z = 0.0;
+    
+            MyAvatar.removeLocalLight();	
+    		--currentNumLights;	
+    	}
+    }   
+}
+
+Controller.keyPressEvent.connect(keyPressEvent);

interface/resources/shaders/model.frag

@@ -11,9 +11,16 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
+
 // the diffuse texture
 uniform sampler2D diffuseMap;
 
+// local lights
+const int MAX_LOCAL_LIGHTS = 2;  // 2 lights for now, will probably need more later on
+uniform int numLocalLights;
+uniform vec3 localLightDirections[MAX_LOCAL_LIGHTS];
+uniform vec3 localLightColors[MAX_LOCAL_LIGHTS];
+
 // the interpolated position
 varying vec4 position;
 
@@ -25,8 +32,19 @@ void main(void) {
     vec4 normalizedNormal = normalize(normal);
     float diffuse = dot(normalizedNormal, gl_LightSource[0].position);
     float facingLight = step(0.0, diffuse);
+    
+    // the local light that is always present
+    vec4 totalLocalLight = vec4(0.0, 0.0, 0.0, 1.0);
+    for (int i = 0; i < numLocalLights; i++) {
+        float localDiffuse = dot(normalizedNormal, vec4(localLightDirections[i], 1.0));
+        float localLight = step(0.0, localDiffuse);
+        float localLightVal = localDiffuse * localLight;
+        
+        totalLocalLight += (localLightVal * vec4( localLightColors[i], 0.0));
+    }
+    
     vec4 base = gl_Color * (gl_FrontLightModelProduct.sceneColor + gl_FrontLightProduct[0].ambient +
-        gl_FrontLightProduct[0].diffuse * (diffuse * facingLight));
+        gl_FrontLightProduct[0].diffuse * (diffuse * facingLight) + totalLocalLight);
 
     // compute the specular component (sans exponent)
     float specular = facingLight * max(0.0, dot(normalize(gl_LightSource[0].position - normalize(vec4(position.xyz, 0.0))),

interface/resources/shaders/model.vert

@@ -11,6 +11,8 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
+const int MAX_LOCAL_LIGHTS = 4;
+
 // the interpolated position
 varying vec4 position;
 
@@ -37,3 +39,4 @@ void main(void) {
     // use standard pipeline transform
     gl_Position = ftransform();
 }
+

interface/resources/shaders/model_normal_map.frag

@@ -37,9 +37,14 @@ void main(void) {
         normalizedBitangent * localNormal.y + normalizedNormal * localNormal.z, 0.0);
     float diffuse = dot(viewNormal, gl_LightSource[0].position);
     float facingLight = step(0.0, diffuse);
+    float localDiffuse = dot(viewNormal, gl_LightSource[1].position);
+    float localLight = step(0.0, localDiffuse);
     vec4 base = gl_Color * (gl_FrontLightModelProduct.sceneColor + gl_FrontLightProduct[0].ambient +
-        gl_FrontLightProduct[0].diffuse * (diffuse * facingLight));
+        gl_FrontLightProduct[0].diffuse * (diffuse * facingLight) + gl_FrontLightProduct[1].diffuse * (localDiffuse * localLight));
 
+
+    
+    
     // compute the specular component (sans exponent)
     float specular = facingLight * max(0.0, dot(normalize(gl_LightSource[0].position -
         normalize(vec4(vec3(interpolatedPosition), 0.0))), viewNormal));

interface/resources/shaders/model_specular_map.frag

@@ -10,6 +10,11 @@
 //  Distributed under the Apache License, Version 2.0.
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
+const int MAX_LOCAL_LIGHTS = 2;
+
+uniform int numLocalLights;
+uniform vec3 localLightDirections[MAX_LOCAL_LIGHTS];
+uniform vec3 localLightColors[MAX_LOCAL_LIGHTS];
 
 // the diffuse texture
 uniform sampler2D diffuseMap;
@@ -28,8 +33,19 @@ void main(void) {
     vec4 normalizedNormal = normalize(normal);
     float diffuse = dot(normalizedNormal, gl_LightSource[0].position);
     float facingLight = step(0.0, diffuse);
+    
+    // the local light that is always present
+    vec4 totalLocalLight = vec4(0.0, 0.0, 0.0, 1.0);
+    for (int i = 0; i < numLocalLights; i++) {
+        float localDiffuse = dot(normalizedNormal, vec4(localLightDirections[i], 1.0));
+        float localLight = step(0.0, localDiffuse);
+        float localLightVal = localDiffuse * localLight;
+        
+        totalLocalLight += (localLightVal * vec4( localLightColors[i], 0.0));
+    }
+    
     vec4 base = gl_Color * (gl_FrontLightModelProduct.sceneColor + gl_FrontLightProduct[0].ambient +
-        gl_FrontLightProduct[0].diffuse * (diffuse * facingLight));
+        gl_FrontLightProduct[0].diffuse * (diffuse * facingLight) + totalLocalLight);
 
     // compute the specular component (sans exponent)
     float specular = facingLight * max(0.0, dot(normalize(gl_LightSource[0].position - normalize(vec4(position.xyz, 0.0))),
@@ -38,4 +54,5 @@ void main(void) {
     // modulate texture by base color and add specular contribution
     gl_FragColor = base * texture2D(diffuseMap, gl_TexCoord[0].st) + vec4(pow(specular, gl_FrontMaterial.shininess) *
         gl_FrontLightProduct[0].specular.rgb * texture2D(specularMap, gl_TexCoord[0].st).rgb, 0.0);
+        
 }

interface/resources/shaders/skin_model.vert

@@ -34,6 +34,7 @@ void main(void) {
         position += clusterMatrix * gl_Vertex * clusterWeight;
         normal += clusterMatrix * vec4(gl_Normal, 0.0) * clusterWeight;
     }
+    
     position = gl_ModelViewMatrix * position;
     normal = normalize(gl_ModelViewMatrix * normal);
     

interface/src/avatar/Avatar.cpp

@@ -14,6 +14,7 @@
 #include <glm/glm.hpp>
 #include <glm/gtx/quaternion.hpp>
 #include <glm/gtx/vector_angle.hpp>
+#include <glm/gtc/type_ptr.hpp>
 
 #include <GeometryUtil.h>
 #include <NodeList.h>
@@ -60,7 +61,8 @@ Avatar::Avatar() :
     _moving(false),
     _collisionGroups(0),
     _initialized(false),
-    _shouldRenderBillboard(true)
+    _shouldRenderBillboard(true),
+    _numLocalLights(1)
 {
     // we may have been created in the network thread, but we live in the main thread
     moveToThread(Application::getInstance()->thread());
@@ -81,6 +83,23 @@ void Avatar::init() {
     _initialized = true;
     _shouldRenderBillboard = (getLODDistance() >= BILLBOARD_LOD_DISTANCE);
     initializeHair();
+   
+    for (int i = 0; i < MAX_LOCAL_LIGHTS; i++) {
+        _localLightColors[i] = glm::vec3(0.0f, 0.0f, 0.0f);
+        _localLightDirections[i] = glm::vec3(0.0f, 0.0f, 0.0f);
+    }
+  
+    glm::vec3 darkGrayColor(0.3f, 0.3f, 0.3f); 
+    glm::vec3 greenColor(0.0f, 1.0f, 0.0f);
+    glm::vec3 directionX(1.0f, 0.0f, 0.0f);
+    glm::vec3 directionY(0.0f, 1.0f, 0.0f);
+ 
+    // initialize local lights
+    _localLightColors[0] = darkGrayColor;
+    _localLightColors[1] = greenColor;
+    
+    _localLightDirections[0] = directionX;
+    _localLightDirections[1] = directionY;
 }
 
 glm::vec3 Avatar::getChestPosition() const {
@@ -232,7 +251,7 @@ void Avatar::render(const glm::vec3& cameraPosition, RenderMode renderMode) {
         const float GLOW_DISTANCE = 20.0f;
         const float GLOW_MAX_LOUDNESS = 2500.0f;
         const float MAX_GLOW = 0.5f;
-        
+     
         float GLOW_FROM_AVERAGE_LOUDNESS = ((this == Application::getInstance()->getAvatar())
                                             ? 0.0f
                                             : MAX_GLOW * getHeadData()->getAudioLoudness() / GLOW_MAX_LOUDNESS);
@@ -243,7 +262,23 @@ void Avatar::render(const glm::vec3& cameraPosition, RenderMode renderMode) {
         float glowLevel = _moving && distanceToTarget > GLOW_DISTANCE && renderMode == NORMAL_RENDER_MODE
                       ? 1.0f
                       : GLOW_FROM_AVERAGE_LOUDNESS;
-
+        
+        
+        // local lights directions and colors
+        getSkeletonModel().setNumLocalLights(_numLocalLights);
+        getHead()->getFaceModel().setNumLocalLights(_numLocalLights);
+        for (int i = 0; i < MAX_LOCAL_LIGHTS; i++) {
+            glm::vec3 normalized = glm::normalize(_localLightDirections[i]);
+            
+            // body
+            getSkeletonModel().setLocalLightColor(_localLightColors[i], i);
+            getSkeletonModel().setLocalLightDirection(normalized, i);
+            
+            // head
+            getHead()->getFaceModel().setLocalLightColor(_localLightColors[i], i);
+            getHead()->getFaceModel().setLocalLightDirection(_localLightDirections[i], i);
+        }
+        
         // render body
         if (Menu::getInstance()->isOptionChecked(MenuOption::Avatars)) {
             renderBody(renderMode, glowLevel);
@@ -1122,3 +1157,29 @@ void Avatar::setShowDisplayName(bool showDisplayName) {
 
 }
 
+void Avatar::setLocalLightDirection(const glm::vec3& direction, int lightIndex) {
+    _localLightDirections[lightIndex] = direction;
+    qDebug( "set light %d direction ( %f, %f, %f )\n", lightIndex, direction.x, direction.y, direction.z );
+}
+
+void Avatar::setLocalLightColor(const glm::vec3& color, int lightIndex) {
+    _localLightColors[lightIndex] = color;
+    qDebug( "set light %d color ( %f, %f, %f )\n", lightIndex, color.x, color.y, color.z );
+}
+
+void Avatar::addLocalLight() {
+    if (_numLocalLights + 1 <= MAX_LOCAL_LIGHTS) {
+        ++_numLocalLights;
+    }
+
+    qDebug("ADD LOCAL LIGHT (numLocalLights = %d)\n", _numLocalLights);
+}
+
+void Avatar::removeLocalLight() {
+    if (_numLocalLights - 1 >= 0) {
+        --_numLocalLights;
+    }
+    
+    qDebug("REMOVE LOCAL LIGHT (numLocalLights = %d)\n", _numLocalLights);
+}
+

interface/src/avatar/Avatar.h

@@ -155,7 +155,11 @@ public:
     
 public slots:
     void updateCollisionGroups();
-
+    void setLocalLightDirection(const glm::vec3& direction, int lightIndex);
+    void setLocalLightColor(const glm::vec3& color, int lightIndex);
+    void addLocalLight();
+    void removeLocalLight();   
+ 
 signals:
     void collisionWithAvatar(const QUuid& myUUID, const QUuid& theirUUID, const CollisionInfo& collision);
 
@@ -176,9 +180,14 @@ protected:
     glm::vec3 _mouseRayDirection;
     float _stringLength;
     bool _moving; ///< set when position is changing
-
+    
     quint32 _collisionGroups;
-
+    
+    // always-present local lighting for the avatar
+    glm::vec3 _localLightDirections[MAX_LOCAL_LIGHTS];
+    glm::vec3 _localLightColors[MAX_LOCAL_LIGHTS];
+    int _numLocalLights;
+ 
     // protected methods...
     glm::vec3 getBodyRightDirection() const { return getOrientation() * IDENTITY_RIGHT; }
     glm::vec3 getBodyUpDirection() const { return getOrientation() * IDENTITY_UP; }

interface/src/avatar/SkeletonModel.h

@@ -109,6 +109,7 @@ public:
     void resetShapePositionsToDefaultPose(); // DEBUG method
 
     void renderRagdoll();
+    
 protected:
 
     // virtual overrrides from Ragdoll

interface/src/renderer/Model.cpp

@@ -1488,14 +1488,19 @@ void Model::renderMeshes(float alpha, RenderMode mode, bool translucent, bool re
             if (cascadedShadows) {
                 program->setUniform(skinLocations->shadowDistances, Application::getInstance()->getShadowDistances());
             }
-        } else {    
+            
+            // local light uniforms
+            skinProgram->setUniformValue("numLocalLights", _numLocalLights);
+            skinProgram->setUniformArray("localLightDirections", _localLightDirections, MAX_LOCAL_LIGHTS);
+            skinProgram->setUniformArray("localLightColors", _localLightColors, MAX_LOCAL_LIGHTS);
+        } else {
             glMultMatrixf((const GLfloat*)&state.clusterMatrices[0]);
             program->bind();
             if (cascadedShadows) {
                 program->setUniform(shadowDistancesLocation, Application::getInstance()->getShadowDistances());
             }
         }
-
+        
         if (mesh.blendshapes.isEmpty()) {
             if (!(mesh.tangents.isEmpty() || mode == SHADOW_RENDER_MODE)) {
                 activeProgram->setAttributeBuffer(tangentLocation, GL_FLOAT, vertexCount * 2 * sizeof(glm::vec3), 3);
@@ -1622,6 +1627,20 @@ void Model::renderMeshes(float alpha, RenderMode mode, bool translucent, bool re
     }
 }
 
+void Model::setLocalLightDirection(const glm::vec3& direction, int lightIndex) {
+    assert(lightIndex >= 0 && lightIndex < MAX_LOCAL_LIGHTS);
+    _localLightDirections[lightIndex] = direction;
+}
+
+void Model::setLocalLightColor(const glm::vec3& color, int lightIndex) {
+    assert(lightIndex >= 0 && lightIndex < MAX_LOCAL_LIGHTS);
+    _localLightColors[lightIndex] = color;
+}
+
+void Model::setNumLocalLights(int numLocalLights) {
+    _numLocalLights = numLocalLights;
+}
+
 void AnimationHandle::setURL(const QUrl& url) {
     if (_url != url) {
         _animation = Application::getInstance()->getAnimationCache()->getAnimation(_url = url);

interface/src/renderer/Model.h

@@ -32,6 +32,8 @@ class Shape;
 typedef QSharedPointer<AnimationHandle> AnimationHandlePointer;
 typedef QWeakPointer<AnimationHandle> WeakAnimationHandlePointer;
 
+const int MAX_LOCAL_LIGHTS = 2;
+
 /// A generic 3D model displaying geometry loaded from a URL.
 class Model : public QObject, public PhysicsEntity {
     Q_OBJECT
@@ -143,6 +145,10 @@ public:
     /// Sets blended vertices computed in a separate thread.
     void setBlendedVertices(const QVector<glm::vec3>& vertices, const QVector<glm::vec3>& normals);
 
+    void setLocalLightDirection(const glm::vec3& direction, int lightIndex);
+    void setLocalLightColor(const glm::vec3& color, int lightIndex);
+    void setNumLocalLights(int numLocalLights);   
+ 
 protected:
     QSharedPointer<NetworkGeometry> _geometry;
     
@@ -158,6 +164,10 @@ protected:
     bool _showTrueJointTransforms;
     int _rootIndex;
     
+    glm::vec3 _localLightDirections[MAX_LOCAL_LIGHTS];
+    glm::vec3 _localLightColors[MAX_LOCAL_LIGHTS];
+    int _numLocalLights;
+ 
     QVector<JointState> _jointStates;
 
     class MeshState {

interface/src/renderer/ProgramObject.cpp

@@ -10,6 +10,7 @@
 //
 
 #include "ProgramObject.h"
+#include <glm/gtc/type_ptr.hpp>
 
 ProgramObject::ProgramObject(QObject* parent) : QGLShaderProgram(parent) {
 }
@@ -22,3 +23,17 @@ void ProgramObject::setUniform(const char* name, const glm::vec3& value) {
     setUniformValue(name, value.x, value.y, value.z);
 }
 
+void ProgramObject::setUniformArray(const char* name, const glm::vec3* values, int count) {
+    GLfloat* floatVal = new GLfloat[count*3];
+    int index = 0;
+    for (int i = 0; i < count; i++) {
+        assert(index < count*3);
+        const float* valPtr = glm::value_ptr(values[i]);
+        floatVal[index++] = valPtr[0];
+        floatVal[index++] = valPtr[1];
+        floatVal[index++] = valPtr[2];
+    }
+    
+    setUniformValueArray(name, floatVal, count, 3);
+    delete[] floatVal;
+}

interface/src/renderer/ProgramObject.h

@@ -23,6 +23,7 @@ public:
     
     void setUniform(int location, const glm::vec3& value);
     void setUniform(const char* name, const glm::vec3& value);
+    void setUniformArray(const char* name, const glm::vec3* values, int count); 
 };
 
 #endif // hifi_ProgramObject_h

interface/src/voxels/VoxelSystem.cpp

@@ -21,6 +21,8 @@
 #include <SharedUtil.h>
 #include <NodeList.h>
 
+#include <glm/gtc/type_ptr.hpp>
+
 #include "Application.h"
 #include "InterfaceConfig.h"
 #include "Menu.h"
@@ -57,6 +59,8 @@ GLubyte identityIndicesRight[]  = {  1, 2, 6,  1, 6, 5 };
 GLubyte identityIndicesFront[]  = {  0, 2, 1,  0, 3, 2 };
 GLubyte identityIndicesBack[]   = {  4, 5, 6,  4, 6, 7 };
 
+static glm::vec3 grayColor = glm::vec3(0.3f, 0.3f, 0.3f);
+
 VoxelSystem::VoxelSystem(float treeScale, int maxVoxels, VoxelTree* tree)
     : NodeData(),
     _treeScale(treeScale),
@@ -67,7 +71,10 @@ VoxelSystem::VoxelSystem(float treeScale, int maxVoxels, VoxelTree* tree)
     _inOcclusions(false),
     _showCulledSharedFaces(false),
     _usePrimitiveRenderer(false),
-    _renderer(0) 
+    _renderer(0),
+    _drawHaze(false),
+    _farHazeDistance(300.0f),
+    _hazeColor(grayColor)
 {
 
     _voxelsInReadArrays = _voxelsInWriteArrays = _voxelsUpdated = 0;
@@ -373,6 +380,7 @@ void VoxelSystem::cleanupVoxelMemory() {
         delete[] _readVoxelDirtyArray;
         _writeVoxelDirtyArray = _readVoxelDirtyArray = NULL;
         _readArraysLock.unlock();
+    
     }
 }
 
@@ -454,6 +462,7 @@ void VoxelSystem::initVoxelMemory() {
 
         _readVoxelShaderData = new VoxelShaderVBOData[_maxVoxels];
         _memoryUsageRAM += (sizeof(VoxelShaderVBOData) * _maxVoxels);
+        
     } else {
 
         // Global Normals mode uses a technique of not including normals on any voxel vertices, and instead
@@ -521,13 +530,23 @@ void VoxelSystem::initVoxelMemory() {
             _shadowDistancesLocation = _cascadedShadowMapProgram.uniformLocation("shadowDistances");
             _cascadedShadowMapProgram.release();
         }
+        
     }
     _renderer = new PrimitiveRenderer(_maxVoxels);
 
     _initialized = true;
-
+    
     _writeArraysLock.unlock();
     _readArraysLock.unlock();
+    
+    // fog for haze
+    if (_drawHaze) {
+        GLfloat fogColor[] = {_hazeColor.x, _hazeColor.y, _hazeColor.z, 1.0f};
+        glFogi(GL_FOG_MODE, GL_LINEAR);
+        glFogfv(GL_FOG_COLOR, fogColor);
+        glFogf(GL_FOG_START, 0.0f);
+        glFogf(GL_FOG_END, _farHazeDistance);
+    }
 }
 
 int VoxelSystem::parseData(const QByteArray& packet) {
@@ -1114,6 +1133,7 @@ int VoxelSystem::updateNodeInArrays(VoxelTreeElement* node, bool reuseIndex, boo
                     node->setBufferIndex(nodeIndex);
                     node->setVoxelSystem(this);
                 }
+                
                 // populate the array with points for the 8 vertices and RGB color for each added vertex
                 updateArraysDetails(nodeIndex, startVertex, voxelScale, node->getColor());
             }
@@ -1131,11 +1151,13 @@ int VoxelSystem::updateNodeInArrays(VoxelTreeElement* node, bool reuseIndex, boo
 
 void VoxelSystem::updateArraysDetails(glBufferIndex nodeIndex, const glm::vec3& startVertex,
                                      float voxelScale, const nodeColor& color) {
-
+    
     if (_initialized && nodeIndex <= _maxVoxels) {
         _writeVoxelDirtyArray[nodeIndex] = true;
-
+        
         if (_useVoxelShader) {
+            // write in position, scale, and color for the voxel
+            
             if (_writeVoxelShaderData) {
                 VoxelShaderVBOData* writeVerticesAt = &_writeVoxelShaderData[nodeIndex];
                 writeVerticesAt->x = startVertex.x * TREE_SCALE;
@@ -1157,6 +1179,7 @@ void VoxelSystem::updateArraysDetails(glBufferIndex nodeIndex, const glm::vec3&
                 }
             }
         }
+    
     }
 }
 
@@ -1407,6 +1430,10 @@ void VoxelSystem::render() {
         }
     } else 
     if (!_usePrimitiveRenderer) {
+        if (_drawHaze) {
+            glEnable(GL_FOG);
+        }
+
         PerformanceWarning warn(showWarnings, "render().. TRIANGLES...");
 
         {
@@ -1478,6 +1505,10 @@ void VoxelSystem::render() {
             glBindBuffer(GL_ARRAY_BUFFER, 0);
             glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
         }
+        
+        if (_drawHaze) {
+            glDisable(GL_FOG);
+        }
     }
     else {
         applyScaleAndBindProgram(texture);

interface/src/voxels/VoxelSystem.h

@@ -273,7 +273,11 @@ private:
     static unsigned short _sSwizzledOcclusionBits[64];          ///< Swizzle value of bit pairs of the value of index
     static unsigned char _sOctantIndexToBitMask[8];             ///< Map octant index to partition mask
     static unsigned char _sOctantIndexToSharedBitMask[8][8];    ///< Map octant indices to shared partition mask
-
+    
+    // haze
+    bool _drawHaze;
+    float _farHazeDistance;
+    glm::vec3 _hazeColor;
 };
 
 #endif // hifi_VoxelSystem_h