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I have a problem where I can see through a box in blender game, see picture. This effect changes so that the near side of the "chassis" of the truck is invisible when I rotate the model

enter image description here

What can I do to not make this happen?

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3 Answers 3

up vote 8 down vote accepted

The normal (1) of the invisible face points in the wrong direction you can fix that by selecting the face and Ctrl-N.

Screenshot

You can verfiy this by displaying the normals (2)

Alternatively you could disable Backface Culling in the material's Game Settings (3).

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You can also select all of the faces and "flip normals" (W then F). Or select the object and "Recalculate Outside" (Ctrl N). –  Thomas Dec 13 '13 at 18:04

I think something wrong with face normals, you could check it this way:

Normals

Usually these lines should be at outer side of object volume. Track body shouldn't be considered as just box without top, it is very thin object with surfaces directed to "inside" and "outside".

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This is most definitely a result of the bit buffer depth, maybe try 16 bit if your not already there. Also you could increase the multisampling size, nonetheless the problem lies within your normals overlapping due to one of the lather:

http://en.wikipedia.org/wiki/Z-buffering

http://www.delta3d.org/filemgmt_data/files/10_Intro%20Blender%20Mesh%20Modeling-Spin.pdf

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