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Why does adjusting the 3D Viewport's Start Clip setting not effect the 3D Viewport view when in Orthographic mode? The End Clip setting works, but the Start doesn't seem to...is this a bug?

enter image description here

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    $\begingroup$ weird, that looks like a bug $\endgroup$ – Vader Apr 13 '14 at 16:53
  • $\begingroup$ It does work on perspective but not on orthogonal view $\endgroup$ – cegaton Apr 13 '14 at 17:05
  • $\begingroup$ @cegaton good point. $\endgroup$ – Vader Apr 13 '14 at 17:34
  • $\begingroup$ related: blender.stackexchange.com/questions/40190/… $\endgroup$ – cegaton Oct 18 '15 at 0:00
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The reason is "when perspective is disabled only the far Clip-End is used":

A large clipping range will allow you to see both near and far objects, but reduces the depth precision. To avoid this...

  • increase the near clipping when working on large scenes.
  • decrease the far clipping when objects are not viewed at a distance.

When perspective is disabled only the far Clip-End is used, very high values can still give artifacts.

This is not specific to blender, all OpenGL/DirectX graphics applications have these same limitations.

enter image description here

(Source: Blender Manual via Campbell Barton)

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