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Thread: Sun Light in Interior Rendering

  1. #1
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    Sun Light in Interior Rendering

    Hi,

    I was just exploring interior rendering in Revit.

    In one of the rendering where i used Interior-Sun & Artificial lighting for the rendering, the intensity of the sunlight through the window is very harsh and it dominates the entire scene.

    Is there a way to control the intensity of the external lighting so it looks cool for the rendering. I would love to have some amount of sunlight also for the rendering than going in for only artificial light.

    Thanks. .

  2. #2
    Forum Addict GMcDowellJr's Avatar
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    That's how it woks in photography too. You can either set exposure such that you can see through to the outside, and have a darker interior (underexposed), or set it for a bright internal scene where your daylight is extremely bright (overexposed).

    Your eyes have more dynamic range thn a camera or rendering so you perceive the sunlight to be not as bright as your camera/render suggests. You might try multiple scenes with differing exposure values to create a High Dynamic Rnge Image (HDRI) but, fom my own tests, you're not likely o get a great result... though I'd love to figure out how/if its possible (they can do it with photography so why not with renderings). My guess as to why you'll get poor results is that Revit doesn't export a high but depth image.

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    The Moderator with No Imagination MPwuzhere's Avatar
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    Experiment with different times of the day...Since Revit is location aware the sun will shine through where its supposed to. (As long as you did set your location)

    Might try turning on the sun path so you can see what the sun does with your shadows too when setting up a scene.

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    Moderator snowyweston's Avatar
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    Quote Originally Posted by GMcDowellJr View Post
    You might try multiple scenes with differing exposure values to create a High Dynamic Rnge Image (HDRI) but, fom my own tests, you're not likely o get a great result... though I'd love to figure out how/if its possible (they can do it with photography so why not with renderings).
    It's fairly common to create composite outputs from "process rendering" (i.e. lights on/off, materials on/off, maps on/off, etc) since it gives you far more control in post-production - and is totally do-able in Revit - in fact, I find it easier to run a number of renders and play with them in PS/Gimp/etc afterward instead of trying to get that perfect balance in one go.

    There are some fascinating "howto" guides on cgarchitect - where they have a "making of" sub-section that talks about such things.

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    Forum Addict sdbrownaia's Avatar
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    Use early morning or evening. Or do a composite.

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    I did tried by changing the sun setting from Lighting to single day setting and changed the sun position. Now the rendering looks better but i lost the window lighting which i thought it would be dramatic to have it. .

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    Member Shields08's Avatar
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    I like to leave mine on "exterior sun & artificial lighting" then the sun intensity is not as bad, however you do have to adjust the artificial lights to have about 3-4 times the normal intensity or wattage. I like to add invisible lights floating in the room with a high light loss factor so my ceiling lights don't cause harsh hot spots.

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    Quote Originally Posted by theshell07 View Post

    intensity of the sunlight through the window is very harsh and it dominates the entire scene. .
    I also had this problem, tried messing with transparency settings on the glass to no avail

    The solution I used was to build a 40m high wall offset roughly 15m all the way round the model so that although I no longer had direct light, I did still have the ambient light; it is actually quite effective. You could then change the intensity of the ambient light by changing the height and offset distance of the wall.

    Hope this helps

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