Added a "flat" mode for environments that makes them follow you around on the

X/Z axes.  The default environment is flat.  Closes #2378.

interface/interface_en.ts

@@ -14,12 +14,12 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="src/Application.cpp" line="3575"/>
+        <location filename="src/Application.cpp" line="3577"/>
         <source>Open Script</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="src/Application.cpp" line="3576"/>
+        <location filename="src/Application.cpp" line="3578"/>
         <source>JavaScript Files (*.js)</source>
         <translation type="unfinished"></translation>
     </message>
@@ -113,18 +113,18 @@
 <context>
     <name>Menu</name>
     <message>
-        <location filename="src/Menu.cpp" line="437"/>
+        <location filename="src/Menu.cpp" line="439"/>
         <source>Open .ini config file</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="src/Menu.cpp" line="439"/>
-        <location filename="src/Menu.cpp" line="451"/>
+        <location filename="src/Menu.cpp" line="441"/>
+        <location filename="src/Menu.cpp" line="453"/>
         <source>Text files (*.ini)</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="src/Menu.cpp" line="449"/>
+        <location filename="src/Menu.cpp" line="451"/>
         <source>Save .ini config file</source>
         <translation type="unfinished"></translation>
     </message>

interface/src/Application.cpp

@@ -2150,7 +2150,8 @@ void Application::loadViewFrustum(Camera& camera, ViewFrustum& viewFrustum) {
 }
 
 glm::vec3 Application::getSunDirection() {
-    return glm::normalize(_environment.getClosestData(_myCamera.getPosition()).getSunLocation() - _myCamera.getPosition());
+    return glm::normalize(_environment.getClosestData(_myCamera.getPosition()).getSunLocation(_myCamera.getPosition()) -
+        _myCamera.getPosition());
 }
 
 void Application::updateShadowMap() {
@@ -2312,7 +2313,8 @@ void Application::displaySide(Camera& whichCamera, bool selfAvatarOnly) {
         float alpha = 1.0f;
         if (Menu::getInstance()->isOptionChecked(MenuOption::Atmosphere)) {
             const EnvironmentData& closestData = _environment.getClosestData(whichCamera.getPosition());
-            float height = glm::distance(whichCamera.getPosition(), closestData.getAtmosphereCenter());
+            float height = glm::distance(whichCamera.getPosition(),
+                closestData.getAtmosphereCenter(whichCamera.getPosition()));
             if (height < closestData.getAtmosphereInnerRadius()) {
                 alpha = 0.0f;
 

interface/src/Environment.cpp

@@ -92,7 +92,7 @@ glm::vec3 Environment::getGravity (const glm::vec3& position) {
     
     foreach (const ServerData& serverData, _data) {
         foreach (const EnvironmentData& environmentData, serverData) {
-            glm::vec3 vector = environmentData.getAtmosphereCenter() - position;
+            glm::vec3 vector = environmentData.getAtmosphereCenter(position) - position;
             float surfaceRadius = environmentData.getAtmosphereInnerRadius();
             if (glm::length(vector) <= surfaceRadius) {
                 //  At or inside a planet, gravity is as set for the planet
@@ -116,7 +116,7 @@ const EnvironmentData Environment::getClosestData(const glm::vec3& position) {
     float closestDistance = FLT_MAX;
     foreach (const ServerData& serverData, _data) {
         foreach (const EnvironmentData& environmentData, serverData) {
-            float distance = glm::distance(position, environmentData.getAtmosphereCenter()) -
+            float distance = glm::distance(position, environmentData.getAtmosphereCenter(position)) -
                 environmentData.getAtmosphereOuterRadius();
             if (distance < closestDistance) {
                 closest = environmentData;
@@ -132,6 +132,8 @@ bool Environment::findCapsulePenetration(const glm::vec3& start, const glm::vec3
     // collide with the "floor"
     bool found = findCapsulePlanePenetration(start, end, radius, glm::vec4(0.0f, 1.0f, 0.0f, 0.0f), penetration);
     
+    glm::vec3 middle = (start + end) * 0.5f;
+    
     // get the lock for the duration of the call
     QMutexLocker locker(&_mutex);
     
@@ -141,7 +143,7 @@ bool Environment::findCapsulePenetration(const glm::vec3& start, const glm::vec3
                 continue; // don't bother colliding with gravity-less environments
             }
             glm::vec3 environmentPenetration;
-            if (findCapsuleSpherePenetration(start, end, radius, environmentData.getAtmosphereCenter(),
+            if (findCapsuleSpherePenetration(start, end, radius, environmentData.getAtmosphereCenter(middle),
                     environmentData.getAtmosphereInnerRadius(), environmentPenetration)) {
                 penetration = addPenetrations(penetration, environmentPenetration);
                 found = true;
@@ -203,10 +205,12 @@ ProgramObject* Environment::createSkyProgram(const char* from, int* locations) {
 }
 
 void Environment::renderAtmosphere(Camera& camera, const EnvironmentData& data) {
+    glm::vec3 center = data.getAtmosphereCenter(camera.getPosition());
+    
     glPushMatrix();
-    glTranslatef(data.getAtmosphereCenter().x, data.getAtmosphereCenter().y, data.getAtmosphereCenter().z);
-
-    glm::vec3 relativeCameraPos = camera.getPosition() - data.getAtmosphereCenter();
+    glTranslatef(center.x, center.y, center.z);
+    
+    glm::vec3 relativeCameraPos = camera.getPosition() - center;
     float height = glm::length(relativeCameraPos);
     
     // use the appropriate shader depending on whether we're inside or outside

libraries/shared/src/PacketHeaders.cpp

@@ -46,6 +46,8 @@ PacketVersion versionForPacketType(PacketType type) {
     switch (type) {
         case PacketTypeAvatarData:
             return 3;
+        case PacketTypeEnvironmentData:
+            return 1;
         case PacketTypeParticleData:
             return 1;
         case PacketTypeDomainList:

libraries/voxels/src/EnvironmentData.cpp

@@ -14,6 +14,7 @@
 // GameEngine.cpp
 EnvironmentData::EnvironmentData(int id) :
     _id(id),
+    _flat(true),
     _gravity(0.0f),
     _atmosphereCenter(0, -1000, 0),
     _atmosphereInnerRadius(1000),
@@ -25,12 +26,23 @@ EnvironmentData::EnvironmentData(int id) :
     _sunBrightness(20.0f) {
 }
 
+glm::vec3 EnvironmentData::getAtmosphereCenter(const glm::vec3& cameraPosition) const {
+    return _atmosphereCenter + (_flat ? glm::vec3(cameraPosition.x, 0.0f, cameraPosition.z) : glm::vec3());
+}
+
+glm::vec3 EnvironmentData::getSunLocation(const glm::vec3& cameraPosition) const {
+    return _sunLocation + (_flat ? glm::vec3(cameraPosition.x, 0.0f, cameraPosition.z) : glm::vec3());
+}
+
 int EnvironmentData::getBroadcastData(unsigned char* destinationBuffer) const {
     unsigned char* bufferStart = destinationBuffer;
     
     memcpy(destinationBuffer, &_id, sizeof(_id));
     destinationBuffer += sizeof(_id);
     
+    memcpy(destinationBuffer, &_flat, sizeof(_flat));
+    destinationBuffer += sizeof(_flat);
+    
     memcpy(destinationBuffer, &_gravity, sizeof(_gravity));
     destinationBuffer += sizeof(_gravity);
     
@@ -67,6 +79,9 @@ int EnvironmentData::parseData(const unsigned char* sourceBuffer, int numBytes)
     memcpy(&_id, sourceBuffer, sizeof(_id));
     sourceBuffer += sizeof(_id);
     
+    memcpy(&_flat, sourceBuffer, sizeof(_flat));
+    sourceBuffer += sizeof(_flat);
+    
     memcpy(&_gravity, sourceBuffer, sizeof(_gravity));
     sourceBuffer += sizeof(_gravity);
     

libraries/voxels/src/EnvironmentData.h

@@ -19,6 +19,9 @@ public:
     void setID(int id) { _id = id; }
     int getID() const { return _id; }
 
+    void setFlat(bool flat) { _flat = flat; }
+    bool isFlat() const { return _flat; }
+
     void setGravity(float gravity) { _gravity = gravity; }
     float getGravity() const { return _gravity; }
 
@@ -42,6 +45,9 @@ public:
     const glm::vec3& getSunLocation() const { return _sunLocation; }
     float getSunBrightness() const { return _sunBrightness; }
 
+    glm::vec3 getAtmosphereCenter(const glm::vec3& cameraPosition) const;
+    glm::vec3 getSunLocation(const glm::vec3& cameraPosition) const;
+
     int getBroadcastData(unsigned char* destinationBuffer) const;
     int parseData(const unsigned char* sourceBuffer, int numBytes);
     
@@ -49,6 +55,8 @@ private:
 
     int _id;
     
+    bool _flat;
+    
     float _gravity;
 
     glm::vec3 _atmosphereCenter;