why???

Support Basics & Interface
1

:x Why do i get this result when i render my pic ?

2

It might have something to do with what rastas smoke and forgetfulness.

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3

http://img41.echo.cx/my.php?image=1237qc.png

I’d say squeeze your Clipstart and Clipend closer together. It may also be your Bias setting.

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4

sorry mon %| http://img41.echo.cx/my.php?image=1237qc.png

5

… or, if a ray shadow:
http://www.blender3d.org/cms/Misc_improvements.355.0.html