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This question already has an answer here:

I'm just following a tutorial on youtube, but when it comes to the end I cannot render the file, it always stucks and makes the screen black sometimes just showing nothing.

If anyone can help it would be appreciated. Thank you.

http://www.mediafire.com/download/vjvnaccxmyydmxn/lightsaber.blend1

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marked as duplicate by someonewithpc, cegaton, gandalf3 rendering Feb 22 '16 at 6:44

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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The file renders fine. But you are needlessly taxing your machine with too many subdivisions on the subsurf modifier:

![enter image description here

BE CAREFUL! In my experience going over 3 is not necessary and does have a huge impact on the computer's performance. Keep in mind that for every subdivision the number of polygons at render time increases exponentially.

Form the manual

Great levels of Subsurf demands more video memory, and a faster graphics card. Blender could potentially crash if your level of Subsurf surpasses your system memory.

Note about potential crashes: Be aware that the Subsurf Modifier will need more and more memory at higher levels of subsurf, and the more dense your base mesh, the more memory you will need. In 32 bit systems, Blender could potentially crash with malloc errors, when you surpass 2~3 GiB of memory used. This is not a Blender bug. Blender, when paired with a 64 bit system, could use 64 GiB of memory, thus reducing the chances of malloc() errors.

enter image description here

enter image description here

Same scene with 3 levels of subsurf

enter image description here

And with only 2

enter image description here click on image to enlarge

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  • $\begingroup$ thank you for helping me,this is the second day i'm using blender,and i do not know about subsurf demand can make crash,i change to level 3 subsurf and it works greatly. Im really helpfull thank you very much $\endgroup$ – Andrew Feb 22 '16 at 3:24

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