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I was wondering how can I eliminate the black stripes when I render HDRI textures. I'm new at the HDRI world.

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    $\begingroup$ make the ground larger and model some environment, hills, trees, buildings, etc. to create some skyline. $\endgroup$ Oct 22, 2018 at 21:49

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If you are learning to use HDR, use a proper HDR image that is meant to be used for a 3D rendering.

You need an image that covers a range of 360 degrees preferably in equirectangular projection or Quadrilateralized spherical cube

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In other words: a panoramic image that you can use as the world. Think of it as a large sphere that surrounds and lights your scene. It has to contain the information of the ground and the sky all around.

See: http://blog.gregzaal.com/tag/equirectangular/

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Alternately, you can use a map node with HDRIs, just as easily as image textures. Go to your world tab in your node editor, and plug it into your HDRI.

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