Gravity is ON near origin, off in space, and a gravity field can be created with getGravity()

interface/src/Avatar.cpp

@@ -378,7 +378,7 @@ void Avatar::simulate(float deltaTime) {
     
     if ( AVATAR_GRAVITY ) {
         if ( _position.y > _bone[ AVATAR_BONE_RIGHT_FOOT ].radius * 2.0 ) {
-            _velocity += glm::dvec3( 0.0, -1.0, 0.0 ) * ( 6.0 * deltaTime );
+            _velocity += glm::dvec3(getGravity(getPosition())) * ( 6.0 * deltaTime );
         }
         else {
             if ( _position.y < _bone[ AVATAR_BONE_RIGHT_FOOT ].radius ) {
@@ -1267,3 +1267,18 @@ void Avatar::processTransmitterData(unsigned char* packetData, int numBytes) {
     
 }
 
+//  Find and return the gravity vector at my location 
+glm::vec3 Avatar::getGravity(glm::vec3 pos) {
+    //
+    //  For now, we'll test this with a simple global lookup, but soon we will add getting this
+    //  from the domain/voxelserver (or something similar)
+    //
+    if (glm::length(pos) < 5.f)  {
+        //  If near the origin sphere, turn gravity ON
+        return glm::vec3(0.f, -1.f, 0.f);
+    } else {
+        //  If flying in space, turn gravity OFF
+        return glm::vec3(0.f, 0.f, 0.f);
+    }
+}
+

interface/src/Avatar.h

@@ -218,6 +218,9 @@ class Avatar : public AvatarData {
         void processTransmitterData(unsigned char * packetData, int numBytes);
         float getTransmitterHz() { return _transmitterHz; };
     
+        //  Find out what the local gravity vector is at this location
+        glm::vec3 getGravity(glm::vec3 pos);
+    
     private:
         AvatarHead        _head;    
         bool              _isMine;

libraries/avatars/src/AvatarData.cpp

@@ -171,10 +171,8 @@ int AvatarData::parseData(unsigned char* sourceBuffer, int numBytes) {
     return sourceBuffer - startPosition;
 }
 
-glm::vec3 AvatarData::getPosition() {
-    return glm::vec3(_position.x,
-                     _position.y,
-                     _position.z);
+const glm::vec3& AvatarData::getPosition() const {
+    return _position;
 }
 
 void AvatarData::setPosition(glm::vec3 position) {

libraries/avatars/src/AvatarData.h

@@ -20,7 +20,7 @@ public:
     
     AvatarData* clone() const;
     
-    glm::vec3 getPosition();
+    const glm::vec3& getPosition() const;
     void setPosition(glm::vec3 position);
     void setHandPosition(glm::vec3 handPosition);