Uniform Texture, Rendering Problem

Scene Setup:

• Using Unity3D 4.6.9

• Anti Aliasing: 8X, Shadow disabled.

• Main Camera (Depth only, Perspective, Clipping Planes 100-25000)

• Attached "RenderImage" script to Main Camera (Shader: Contrast, Brightness: 1, Saturation: 1, Contrast: 3)

• Light (Directional, Pos & Rot both Vector3.Zero, Intensity: 0.9, No Shadows)

• Point A (0, 0, 0) - Main Camera and Light

• Point B (0, 0, X) - 3D object (aircraft model) with Diffuse material

'near distance'

'far distance'

I'm trying to simulate an object to travel in forward direction from point B to point A. I notice there is a difference in the object texture at far distance (1 and 2).

My Question is, How to get a smooth rendering for far away object?

Steps I have tried to no avail:

• Set different near/far clipping values

• Using different shader material like Specular, Vertex Lit, and some Custom Shader.

• Update project using latest Unity3D 5