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I'm trying to generate height-map for spherical planet with perlin noise. How can I make it with seamless left/right borders? I smoothed heightmap in poles, but cannot understand how can I loop left and right sides.

This is how my textures look liked for now:

heightmap

Spektre
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Yuri
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  • if you mean seamless join then you can mirror by y axis so the texture will be join-able. In this case I would also rewrite the `loop` to `make seamless` because the loop implies `for`/`while` loops and mislead quite a bit of your topic – Spektre Oct 13 '15 at 08:49
  • @Spektre in this case the planet will have mirrored sides – Yuri Oct 13 '15 at 08:56

1 Answers1

3

  1. Mirroring (by y-axis)

    This is great for making seamless background textures. But as you mentioned the texture must not contain distinct patterns otherwise it would be obvious. This can be used as a start point for texture generator

    mirror by y

  2. Morphing

    There are vector and raster morphs out there depend on the content of image. You can try to use simple raster morph done by Linear interpolation (if resolution is the same which is your case) but this can make the texture blurry which can be disturbing on some images. For starters you can try to morph texture and its mirror together:

    This is cosine weight distribution (50%:50% on sides and 100%:0% in the middle):

    raster interpolation morphraster interpolation morph

    This is constant weight distribution (50%:50%):

    enter image description hereenter image description here

  3. adjusted texture generators

    You can adjust your current texture generator to render seamlessly

    1. create/use seamless texture background (created by #1,#2 or even #3)

    2. add random number of random features with looped x axis

      • so if x is going out from the left it will go in from the right ...
      • x' = x%xs where xs is texture x-resolution
Spektre
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  • @Yuri added morph examples both images are twice times dropped here so you can see how the join will look like. If you got own texture generator code then the option #3 is your best bet – Spektre Oct 13 '15 at 10:02