Hdri Sky Multi-Exposure
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Here are the Frequently Asked Questions.

We are pretty sure you'll find your answers here, so please, read them carefully before contacting us.

    • If I modify these skies, can I resell or share them ?

    No, you are of course free to use and modify any sky you have purchased on this website, but you are not allowed to share, redistribute or resell such sky, even if you have modified it before.

    • Can I re-upload them on a website or transfer them by way of uploading them on a website (such as WeTransfer or any other similar platform)?

    We are afraid this is absolutely not possible, for any reason. We have worked really hard on these skies, we just cannot afford to risk making them available for free to a large number of people - we trust you will understand! :)

    • I have created a 3D scene, rendered it with an "HDRi Skies 360" sky and I want to make a bundle of my scene to share it or to sell it. Can I include "HDRi Skies 360" skies that I have used in it ?

    No, you are of course free to use and create anything you want with any sky you have purchased on this website, but you are not allowed to share, redistribute or resell such sky, even if you have modified it before.

    • I have right-clicked and saved one of your sky previews on my computer, can I use it?

    Yes, if it's for personal use.

    No, if it's for commercial use.

    • What is an Hemispherical/Rectilinear sky ?

    Hemispherical means that this kind of map can be applied to a sphere, but that only the top half part of this sphere will be available.

    Rectilinear is the type of projection used to apply this kind of map correctly on a sphere.

    This is the same thing as spherical projection in 3D software.

    This is why you can see a warping at the top of these skies.

     

     

    • Why is the bottom half part of the map black ?

    This is because most of render engines use spherical projection which needs a map to be twice larger than it is high so that it can be applied correctly. Feel free to crop it, but it will be probably deformed.

    • Why does a black or white spot appear on the highest point of my sky in render time ?

    That happens when you apply maps on polygonal sphere objects.

    To avoid this, use the "skydome lights" that are available in almost all render engines on the market.

    To achieve this correctly, please refer to the "Help" documentation of your rendering software.

    Sphere Object

    Skydome light

    • What are Evs ?

    Please refer to this section.

    • How have they been measured ?

    As on many other HDR websites, we used a free tone mapping software named "Picturenaut" to measure Evs.

    To guarantee the best accuracy, we first cropped the black bottom part of our skies, before measuring them.

     

     

    14.46 Ev

    =

    Retained Value

    21.83 Ev

    • Why are some skies only available in JPEG format ?

    When EVs are really low, there is no point in using 32 bit formats. That is why we have decided to offer EXR only when EVs are greater than or equal to 4, and only JPEG in other cases.

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