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  • HDRI help

    I'v watched both video tutorials and read a couple post on here, but i still can't get it to work right. Although I've tried with an actual hdri file and failed, what i really want to do is to use this 360 sky: http://www.mediafire.com/i/?y6vbf8j3t7jd9bx


    here are my settings. http://www.mediafire.com/i/?m3r18yur3a1hu6s

    i know this is not a an official hdri image but i had the same problem using a "real" hdri image. as far as i understand the only difference between hdri and 360 skies is that the bottom half is just filler color.

  • #2
    Re: HDRI help

    basically i'm trying to use the vray sun and sky for the gi but use a 360 image for the the background because i need the glass from some tall apartment buildings to reflect something. two problems: spherical mapping sometimes turns my image sideways and stretches it strangely. second of all, the physical camera causes the background image to be so dark that it's black.

    so, if i want to use a daylight system with the sun, what is the best way to add a background sky so the skyscraper glass reflects clouds?

    i want to use the sketchup lighting system so that i can control the sun shadows, which means i need to use the physical camera right? if i use hdri, can i control the direction and height of the sun?

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    • #3
      Re: HDRI help

      This is how i do it, works every time

      1) Open Vray Options
      2) Click on Environment
      3) Click on the Capital 'M' to the right of Background
      4) Change type to BITMAP in pull down menu
      5) Change Multiplier to 40,000-60,000 (yes forty to sixty thousand)
      6) Change mapping to SPHERICAL
      7) Click capital 'M' under bitmap and locate your HDRI or JPEG of TIF (etc...)
      Apply
      9) <<<<....Render.....>>>>

      Good luck...
      && let me know how you go...

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      • #4
        Re: HDRI help

        still no luck. if i increase the intensity in the environment, it increases the brightness, but i lose all the contrast to the sky image.


        i have this image:

        all i want to do is wrap it around my scene. how hard can this be? these are my settings :

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        • #5
          Re: HDRI help

          I have tryed what you said but everything became white...
          Did i make a mistake?

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          • #6
            Re: HDRI help

            Hmm. this doesnt seem right, it will be different depending on your original settings


            Try loading the settings ive attached via the link below(uploaded via you-send-it), then follow the same steps as outline before,
            http://www.yousendit.com/download/T1...Z1BENlJFQlE9PQ

            let me know how you go..(note: im using an older version of VRAY)

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            • #7
              Re: HDRI help

              in the latest version, there seems to be more sensativity to light for some reason, we really have been trying to figure out why, but for now, try setting the multiplier to something a bit lower than 60,000, like maybe 100, then try 1000, then 10000. Find the brightness you want, and adjust accordingly
              Best regards,
              Devin Kendig
              Developer

              Chaos Group

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              • #8
                Re: HDRI help

                If the image that you are using for the GI Color is not and HDRI you will not get a good Illumination. Because the jpg doesn't have light information as soon as you increase the multiplier you are increasing all the color of the image as the same time and you will not get any contrast at all. HDRI is an special type of image that capture a wider range of colors than a normal image (specially colors brighter that white), thus contain light information. This doesn't happen with a regular image. You can use a regular image for the reflection but not for the illumination of your scene.

                Best

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