cc.Scene.ClassName = "Scene";

function cc.Scene:setHeightMap(fileName)
	if self:getHeightField() then
		self:removeComponent(self:getHeightField());
	end

	if self:getCollisionObject() then
		self:removeComponent(self:getCollisionObject());
	end

	local heightField = cc.HeightFieldComponent:load(fileName);
	self:addComponent(heightField);
end

function cc.Scene:getHeightMap()
	local heightField = self:getHeightField();
	if not heightField then
		return nil;
	else
		return heightField:getFileName();
	end
end

-- 获取一个点的高度信息
-- worldPos为二位坐标点
function cc.Scene:getHeight(x, z)
	local heightField = self:getHeightField();
	if not heightField then
		return 0
	end
	
	return heightField:getHeight(x, z)
end

function cc.Scene:loadFromXmlNode(xmlNode)
	cc.Node2D.loadFromXmlNode(self , xmlNode);
	local fog = xmlNode.Fog;
	if fog then
		self:setFog(fog);
	end
	local heightMapFile = xmlNode.HeightMapFile;
	if heightMapFile and heightMapFile ~= "" then
		self:setHeightMap(heightMapFile);
	end

end

function cc.Scene:createNode()
	local node = cc.Scene:create();  
	return node;
end