I am making a house in Blender in wich i want to walk around using Blender game engine. Everything displays well, but when i press "P" to start the game, it renders only a few poligons from the entire scene. What can be wrong? Thank you so much!

Print 1 enter image description here

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    $\begingroup$ Did you try to recalculate normals? $\endgroup$
    – Denis
    Commented Jul 28, 2015 at 13:33
  • $\begingroup$ I did just now, still doesn't work. $\endgroup$
    – Andrei
    Commented Jul 28, 2015 at 13:34
  • $\begingroup$ @Andrei , you may need to manually flip normal or give the trouble walls thickness, alternatively, you can un-check the backface culling option under game-options in the materials tab. It also looks like you are using MultiTexture to render your scene, GLSL gives better results. $\endgroup$
    – ruckus
    Commented Jul 28, 2015 at 14:58
  • $\begingroup$ I unchecked Backface culling, i set the shading to GSLS, i applied Solidify modifier, the same. I don't know how to manually flip normals... $\endgroup$
    – Andrei
    Commented Jul 28, 2015 at 15:31

1 Answer 1


Some faces won't render so what it means is that you propably have Backface culling activated(means that only the faces in the direction of the normals are getting rendered).

Select the object whose faces won't appear.

Then go into edit mode by pressing tab.

In the "N" panel find the mesh display and under "Normals" select faces (the 3rd icon).

Blue lines (these segments are called Normals) are gonna come out of the faces of your object. The faces will be rendered from the side these blue lines go to. So if the faces that won't render have their blue lines going inside, it means this is your problem.

What you should do to fix this is:

press ctrl+N (with the faces still selected) and then in the "T" panel the "Make normals consistent" option is gonna appear with an unchecked box. Check it and it should be fine. This is the manual way in case of selecting all faces and pressing ctrl+N won't fix your problem.

p.s. if you want your plane to render both ways, deactivate backface culling in the "N" panel below shading mode.

  • $\begingroup$ I apreciate your consistent answer and i did everything you've said, but unfortunately this couldn't solve my problem, only partially. I atached prints: postimg.org/image/83gj0xq6p and postimg.org/image/extrqmfa5 $\endgroup$
    – Andrei
    Commented Jul 29, 2015 at 8:53
  • $\begingroup$ Can you share the blend file through pasteall.org/blend , so I can have a look at it? $\endgroup$
    – Lev
    Commented Jul 29, 2015 at 12:14
  • $\begingroup$ Oh my god, i figured it out, "Backface culling" was enabled in many other materials, i though it was something general wich is enough to disable it once. Than you so much for your advices! $\endgroup$
    – Andrei
    Commented Jul 30, 2015 at 13:55
  • $\begingroup$ Nice job lev, couldn't have said it better myself... oh.. one sec. :D $\endgroup$
    – ruckus
    Commented Aug 3, 2015 at 20:54

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