Usage of Cesium Geoserver Terrain Provider Plugin for a single tile of SRTM90 data

I'm attempting to use Cesium Geoserver Terrain Provider Plugin for terrain visualization.

I downloaded one tile from http://ift.tt/1iO5oQI address such as 42_05 region. I extracted the tiff file and introduced it to my Geoserver (version 2.4.4) as a layer. From layer preview in Geoserver, I see the region where the tile belongs and it is rendered in gray tones.

I'm trying to create terrain visualization for only 42_05 region. I dont want to create image pyramid etc. Just get elevation data in 42_05 region and terrain visualization for only 42_05 region.

After reading the steps in http://ift.tt/XIMByQ, I used GeoserverTerrainProvider.js and the sample initialization code.

Unfortunately, terrain visualization is not activated and when I inspect coordinates in the tile region from Cesium, height values are either 0 or very small values such as 1e-9.

Alternatives of plugin usage (I tried all of them with no positive result)

1.Translated tiff file using the translator java utility (provided by the plugin) and defined it as a layer in Geoserver and then used it in Geoserver Terrain Provider Plugin.

2.I used the original tiff file and I installed dds/bil plugin.

3.I used styled xml file with the original tiff file.

What can be the reason for the above issue I described? I would appreciate any help/advice from Cesium Geoserver Terrain Provider users.