add Voxels.getFaceVector() to JS

libraries/voxels/src/VoxelsScriptingInterface.cpp

@@ -64,3 +64,21 @@ RayToVoxelIntersectionResult VoxelsScriptingInterface::findRayIntersection(const
     }
     return result;
 }
+
+glm::vec3 VoxelsScriptingInterface::getFaceVector(const QString& face) {
+    if (face == "MIN_X_FACE") {
+        return glm::vec3(-1, 0, 0);
+    } else if (face == "MAX_X_FACE") {
+        return glm::vec3(1, 0, 0);
+    } else if (face == "MIN_Y_FACE") {
+        return glm::vec3(0, -1, 0);
+    } else if (face == "MAX_Y_FACE") {
+        return glm::vec3(0, 1, 0);
+    } else if (face == "MIN_Z_FACE") {
+        return glm::vec3(0, 0, -1);
+    } else if (face == "MAX_Z_FACE") {
+        return glm::vec3(0, 0, 1);
+    }
+    return glm::vec3(0, 0, 0); //error case
+}
+

libraries/voxels/src/VoxelsScriptingInterface.h

@@ -60,6 +60,9 @@ public slots:
     /// If the scripting context has visible voxels, this will determine a ray intersection
     RayToVoxelIntersectionResult findRayIntersection(const PickRay& ray);
 
+    /// returns a voxel space axis aligned vector for the face, useful in doing voxel math
+    glm::vec3 getFaceVector(const QString& face);
+
 private:
     void queueVoxelAdd(PacketType addPacketType, VoxelDetail& addVoxelDetails);
     VoxelTree* _tree;