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How to create a point light in Iray?

moon_babymoon_baby Posts: 41
in Technical Help (nuts n bolts)

Hi, guys!

OK, getting to the point, I know how to create a pointlight in Reality.  You just retitle the light to RealityLight and you're done.  Iray doesn't work that way though.  Indeed, the lights rarely even show up in the parameters because most of them are environmental.  I need to create a candle light that actually lights up the person's face from only the candle.  It seems no one makes real lights like that for Iray, at least I haven't noticed any. I found a bonus "pointlight" in elianeck's lightset but it literally shows up in the render as a big screen if you put it inside the viewport, and if you make it invisible, it turns off the light.  So if anyone knows how to create pointlights in Iray or if there is an actual purchaseable set of lights that works like a candlelight, then point me in that direction.smiley

Thanks you to whoever answers!!

Comments

  • FishtalesFishtales Posts: 6,119
    edited February 2016

    If the candle has a flame and it has a separate surface from the rest of the candle then use the Emissive Shader on it and turn it into a light.

    Post edited by Fishtales on
  • moon_babymoon_baby Posts: 41

    @Fishtales

    Ooh, that sounds cool and easy.surprise  Does this emmisive shader come with Daz Studio 4.9 or do you have to purchase it and where?  Thank you for your reply.  I'm feeling hope!

  • FishtalesFishtales Posts: 6,119

    It comes with Daz Studio and is beside the other Iray shaders, or it is in 4.8 as I don't have 4.9 I assume it is in the same place.

  • moon_babymoon_baby Posts: 41

    @Fishtales

    I found it!!  Thank you!  I will try it out as soon as I have time and tell you how it goes.  ...You've been here since 1969?!  Whoa, that's a long time.  Cool though.laugh

  • Oso3DOso3D Posts: 15,009

    It comes with it. You go into Shader Presets, Iray, and there's a tab for Emissives (with only one in it). It's optimized for emissive surfaces.

    You can also turn any Iray Uber Shader into an emissive surface by setting it's emission color to something other than black. It's less efficient, but I usually just go with Uber shader because I forget to do otherwise.

     

    Note that emissive surfaces render a bit slower, based on the surface complexity. (Because each polygon is calculated, I believe)

    If you CAN get away with using a standard point/spot light with geometry (sort of default shapes you can select), it's better to do so, like if the light is coming from offscreen or simple shapes suit what you are going for.

    Emissive surfaces, however, have the benefit that you can place a texture map in the color to get varied color (and intensity) light, which is great for fire/flame.

     

  • FishtalesFishtales Posts: 6,119

    1969? No, that is the date that is added because I didn't enter a date when registering laugh

  • ChoholeChohole Posts: 33,604

    No actually there are quite a number of people who have 31/12/1969  as their start date.  This was caused by one of theose  "zero" errors which occasionally hit things. Happened on the old, old forums which, as those of us who were there then know, was held together with duct tape, chewing gum and string..   It is something tp do with Unix

    In PHP, a good sign that something is wrong with your date data or logic is when you start seeing dates displayed as “12/31/1969”

    Demystifying 12/31/1969 (or 1/1/1970 for Eastern Hemisphere folk)

    Since the Unix timestamp is based off the Unix Epoch, an invalid timestamp defaults to to the Epoch (Thu, 01 Jan 1970 00:00:00 +0000).

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