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Texture Import error width and height power of 2

Discussion in 'General Discussion' started by Ralph71, Sep 22, 2005.

  1. Ralph71

    Ralph71

    Joined:
    Sep 22, 2005
    Posts:
    2
    Hi there,

    I have a scrubs question (day 1 of the trial):
    When importing a 3DS file from a CD by Taschen (500 3D-Objects) I always (I tried 3 models) get the error that the textures have to be a power of 2 in width and height. -Why? Is that a restriction? Any workaround?

    Thanks

    Ralph
     
    Ralph71, Sep 22, 2005
    #1

  2. Joachim_Ante

    Joachim_Ante

    Unity Technologies

    Joined:
    Mar 16, 2005
    Posts:
    5,203
    You can scale up your texture in photoshop.

    This is because todays graphcs card do not have good support for non-power of two textures.

    Thus it is better to require that content is created in a format that is well supported.

    Specific issues with non-power of two textures
    * they are not supported on all graphics cards
    * they can not repeat
    * they can not have mipmaps
    * they make shaders more complex to write
     
    Joachim_Ante, Sep 22, 2005
    #2

  3. Ralph71

    Ralph71

    Joined:
    Sep 22, 2005
    Posts:
    2
    Hi,

    thanks for the fast response.

    1)
    I'm not sure, but the textures aren't quads, so what happens to the view of the object when scaling the texture? I suppose the wouldn't fit any more?

    2)
    The scaling is a lot of work. Do you think there is a batch processing possible? Have any scripts for batch this task? -By the way I only have fireworks.
     
    Ralph71, Sep 23, 2005
    #3

  4. Joachim_Ante

    Joachim_Ante

    Unity Technologies

    Joined:
    Mar 16, 2005
    Posts:
    5,203
    You could try making the texture the next power of two size.
    Then put the image in the top-left.
    And the lower part just remains white or whaver.

    Then you use the texture scale in the material to make the texture fit.
     
    Joachim_Ante, Sep 23, 2005
    #4

  5. NicholasFrancis

    NicholasFrancis

    Joined:
    Apr 8, 2005
    Posts:
    1,587
    If the models you're using are mapped correctly inside 3DS / 3DMax, you probably should just rescale the textures to a power-of-two. IIRC, 3DS stores the texture coordinates as fractions, so changing the texture size won't change how they map to the object.
     
    NicholasFrancis, Sep 24, 2005
    #5