Depth Texture position height

Questions
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1

I have a shaderMaterial, i want to use the scene’s Depth Texture to displace it vertically, so far the examples return a ‘Z’ val ue only, could i access the vec3 position, or the Y
Here is the example code :

float readDepth( sampler2D depthSampler, vec2 coord ) {
				float fragCoordZ = texture2D( depthSampler, coord ).x;
				float viewZ = perspectiveDepthToViewZ( fragCoordZ, cameraNear, cameraFar );
				return viewZToOrthographicDepth( viewZ, cameraNear, cameraFar );
			}