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Tip of the Week - HDRi Skies

Posted by Michele on August 9, 2010 at 7:58am in IRender nXt ArielVision 3D Design Studio (Sket

Hello....

 

I am having some difficulty using the HDRi skies...just seeing a small portion of the selected sky for rendering purposes....however when I look at the tip of the week on the Renderplus website, the HDRi sky is clear, visible and at the right scale...

 

can someone tell me how to scale these HDRi skies that have come with the program itself?  and is this possible to resize them and reuse?

 

Why /how was the rendering done in the example?

 

thanks!

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Replies

  • Michele August 9, 2010 at 8:50am
    thanks...read that info before in an earlier discussion...but I still cannot use the HDR images when I select from the given library

    can you tell me for that particular rendered image what HDRi sky was used and if not was the HDR image altered from the presets in the IRender nXt ...http://www.renderplus.com/wk/Tip_of_the_Week_-_HDRi_Skies_w.htm

    I am just trying to simplify the rendering process by selecting from the given presets and still get the desired result of having a background that is reflected and visible - to scale

    help?
  • Render Plus August 9, 2010 at 8:34am
    An HDri Sky is a full spherical image - 360 degrees pf sky, 180 degrees above the horizon and 180 degrees below the horizon. If you are making a 1,000 pixel rendering with a 60 degree field of view, then you will only see 1/6th of the full image (in width) and 1/2 or less of the image in height, so a 1,000 x 1,000 pixel rendering needs a Sky with at least 1/2 of 6,000 x 6,000 resolution.

    I say 1/2 because you can usually enlarge the background image by about 2 : 1 without much loss of quality. So 3,000 x 3,000 would work for the HDRi image, but 6,000 x 6,000 would be better. And for higher resolution renderings, or smaller FOVs you would need even larger images.

    Samples of HDRi skies.
    Notice how each image covers a full 360 degree Spectrum.
    (Images courtesy Evermotion)

    EvHDRs_orig.jpg

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