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  • #31
    No, its correct. I wishlisted preserve exposure earlier: http://forums.chaosgroup.com/showthr...-Number)-value
    Win11 Pro 64bit, GTX 970, Standalone version: V-Ray Next 4.30.03,

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    • #32
      Something seems messed up. I had to use an F-stop number of 0.1 and a Shutter Speed of 100,000 to get a slight DOF effect in my test scene. According to Photography & Rendering with V-Ray, the V-Ray Physical Camera should be simulating a DSLR but I don't think those numbers are even possible. Also it was taking over 30 minutes to render the same image that takes 5 seconds. I am going to render the same scene in 3ds Max with V-Ray and see if I have to use such extreme values to produce depth of field. I will let you know what I discover.

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      • #33
        Ok, atleast your F-stop vs Shutter speed values sounds correct when you trying to keep exposure:
        Original: F-Stop = 8, Shutter speed = 500, EV = 15
        Later: F-Stop = 0.7, Shutter speed = 64000, EV = 15

        Click image for larger version

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        Win11 Pro 64bit, GTX 970, Standalone version: V-Ray Next 4.30.03,

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        • #34
          Thanks for that. Is there a math formula to figure it out because my F/Number of 0.1 is "off the charts"....which is really my point. I don't think I am seeing the "virtual camera" performing like a real camera so I am wondering what is going on. At this point though, having a math formula that would help me keep the same exposure value would be helpful. I also think something is messed up if a render that is normally 5.1 seconds to render takes over 30 minutes because of some slight DOF. That is so expensive I wouldn't ever want to even use DOF. Doesn't that sound like something might be wrong? I posted in the bug area so feel free to grab my test scene and see for yourself.

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          • #35
            Click image for larger version

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            Libre Office Calc file: https://mega.nz/#!HNQ1FAbY!EVa7qxnnq...Q1ra2x12n2YMa4
            Win11 Pro 64bit, GTX 970, Standalone version: V-Ray Next 4.30.03,

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            • #36
              Edit: New Shutter speed value is based on old F-Stop value, new F-Stop value and old Shutter speed value.
              Win11 Pro 64bit, GTX 970, Standalone version: V-Ray Next 4.30.03,

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              • #37
                Thank you! that was really nice of you to post that.

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                • #38
                  Originally posted by The3DNut View Post
                  Thank you! that was really nice of you to post that.
                  +1

                  Thanks! I've always just fudged it. This can be really helpful

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                  • #39
                    can some one help to explain how can i make texture for area lamps like in this photo, or there is another way?

                    [ATTACH=CONFIG]30461
                    Attached Files

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                    • #40
                      that is my result

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                      • #41
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                        • #42
                          hello is anny body at home? can some one explain that, thank you

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                          • #43
                            what are you missing in your renders?

                            if you are looking for the "circles" fo the LED lamps you should create a texture and map the area light with that texture...at least...in 3dsmax I did in this way.

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                            • #44
                              I am using area lights, ok will try that at evening

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                              • #45
                                As bardo said, use a texture in the "Rect Text" of the area light.

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                                architect at oona

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