Set visible=true in header

Author: Taiju Yamada

include/mujincontrollerclient/mujincontrollerclient.h

@@ -793,7 +793,7 @@ class MUJINCLIENT_API ObjectResource : public WebResource
         std::string geomtype;
         Real quaternion[4]; // quaternion [w, x, y, z] = [cos(angle/2), sin(angle/2)*rotation_axis]
         Real translate[3];
-        bool visible;
+        bool visible = true;
         Real diffusecolor[4];
         Real transparency;
         Real half_extents[3];

src/mujincontrollerclient.cpp

@@ -332,7 +332,7 @@ void ObjectResource::LinkResource::GetGeometries(std::vector<ObjectResource::Geo
                 ObjectResource::GeometryResourcePtr geometry(new GeometryResource(controller, this->objectpk, GetJsonValueByKey<std::string>(*it, "pk")));
                 geometry->linkpk = linkpk;
                 LoadJsonValueByKey(*it,"name",geometry->name,geometry->pk);
-                LoadJsonValueByKey(*it,"visible",geometry->visible,true);
+                LoadJsonValueByKey(*it,"visible",geometry->visible);
                 LoadJsonValueByKey(*it,"geomtype",geometry->geomtype);
                 LoadJsonValueByKey(*it,"transparency",geometry->transparency);
                 LoadJsonValueByKey(*it,"quaternion",geometry->quaternion);