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Forums >> Revit Building >> Technical Support >> interior lighting for exterior rendering
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Joined: Sat, Nov 6, 2010
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i am new to Revit, and am using Revit 2011. i am having trouble getting interior artificial lighting to show up through windows for an exterior render. I have checked the box that turns on the lighting family ( Table Lamp - Hemisheric 60W-120V) and have set lighting scheme for exterior sun and artificial lights. what steps am i missing, or what settings do i need to hunt down? thanks
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maybe the glass of your windows has the problem try lowering the reflectance of your glass. another maybe the light of your component is off
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As in the real world, if the sun is shining it's usually difficult to see interior lighting (dpending, of course, on sun angle, time of day, etc.). A 60 W lamp is no match for the lumen power of the sun. Try changing your sun/time of day settings and also try increasing the lumen output of your lamp. Maybe that will help.
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I have found that I have to increase a 60w light up to 1000w or more to get the interior lighting to appear. Also, I have to set the time of day to dawn or dusk, so there is some exterior daylight but not enough to drown out the interior lights. I'm looking at the interior lighitng topics in the forum because I am curious why do I have to increase the interior lighting to 1000w / more in order to the correct look. Does this tell me that I don't have enough lights in the design and when the project is built I will have issue of not enough lights?????
I am assuming there are faults in the rendering what is true to real life.
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The current render engine does NOT work with the correct lighting levels. AccuRender did.
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Do you mean if I want to accurately show what the lighting levels be will per designed, I will need to use Accurender?
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A rendering is not a lighting calculation. It's a pretty picture. If you want to know whether you have sufficient light levels in your project, you need to do a lighting calculation with software like AGI32. A rendering is about the look and feel and composition of the design (i.e., the *quality* of the light). A lighting calculation is about the *quantity* light you are putting on work surfaces, in passageways, on the walls, etc. These are two very different things, so be sure you are using the right tool for the right purpose.
If you're lighting your interior with a table lamp and doing an exterior rendering, think about what the light is hitting- mainly the table it sits on, which may not even be visible from the outside. In your rendering, if you're looking through windows at the room's walls and wondering why they look so dim, it's because relatively little light is hitting them from that table lamp. Also, contrast is extremely important. The brighter your exterior, the harder it will be to see artificial lights inside.
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Thanks Jlights. It was my assumption that with Revit, the idea was to have everything as real as possible including the rendering (which includes how the lights render). But you are correct, I will have to use a different tool to understand the light levels in the space. I am far from a lighting designer or consultant, so I probably couldn't begin to understand the complex lighting tools available.
You can see in the rendering I've produced using Revit. The daylight is set a dawn to reduce the amount of sunlight coming through the windows. I've increased the wattage on the lights to such a high level (1000 -1500w) to get the interior space to be lit.
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Nice. I'm actually a lighting designer myself- if you don't mind a suggestion, I'd move those downlights on the right a bit farther away from the windows so you don't get that light scallop on the wood beam, which distracts from the attractive design of the space.
I'm guessing you did this rendering at Medium (though I could be wrong); if you do it at High or Best the edges of the light beams should soften and you won't have such hard edges on your beams of light. These also create a distracting pattern in the rendering. If you can soften them, your eye will be drawn right to the end of the hall where the light is brightest and you'll have a terrific rendering.
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I usually add a light group of studio lights emitted from a 8'x8' rectangle shape uniform. make the FC about 100,000 for exterior daylight. starting from 100,000 you can double or cut in half the fc until you get the light you want. setting the time for dusk or dawn usually looks pretty good. studio lights are great for creating soft light to enhance your scene
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I see old accuRender tricks alabaster. :-> But these are studio lights not really tricks. A professional photographer would add interior studio lights if he were shooting for real as well.
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yeah i use that and adding an ambient occlussion layer and a glow adjustment layer in photoshop to bring a little more focus onto the interior lights becuase the soft lights aren't "physically correct". all tricks i learned for a photographer
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Thanks jlights - those are great suggestions. I'll move the recessed away from the wood beam. I'll do another render at best to see if the light beams are softer. but yes, that will make the rendering look nicer.
@alabaster2512 - i like the idea of your tricks. how do you set the studio lights to 100,000 FC (footcandles?) and what do you mean by creating light group of studio lights emitted from a 8'x8' rectangle shape uniform. do you place the studio lights in a 8'x8' spacing within the interior space to get the interior to glow?
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can i ask u for rendering setting for this render? example adjust exposure
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I didn't do anything really special to the settings. For Exposure Control, these were the following settings:Exposure vlue: 9
Highlights: 0.25
Mid tones: 1
Shadows: 0.2
White Point: 6500
Saturation: 1
Rendered with Scheme: Interior: Sun and Artificial
Sky: No Clouds
I hope this is helpful.
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