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Forums >> Revit Building >> Technical Support >> Artificial Lights DO NOT turn on in rendered scene
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Joined: Wed, May 14, 2008
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Hi Typhoon, the update for Revit Architecture 2009 in Autodesk website is only hotfix for the activation & AutoCAD... there's no any fix for any technical inside Revit Architecture... OK, now, I attach some picture to compare the render result using STANDARD setting, without tweaking too much... - Scheme for Interior: Sun & Artificial (the problem in main topic)
- Scheme for Interior: Artificial Only (it's so different... It's.. Umm... too bright)
- Scheme for Interior: Sun & Artificial w/ lighting set to 350 Watt (Still too dark)
- Scheme for Interior: Sun & Artificial w/ lighitng set to 350 Watt & adjust the exposure
- Setting for the Lighting dim (used in all rendering)
For sun & shadow setting.. I set the time at 11:59 PM I really.. really have to learn more about this.. 
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Hi Vicozzio, the update for revit Architecture 2009 in Autodesk website in NOT ONLY for hotfix for the activation & Autocad, this update like you can to see here: http://www.revitcity.com/forums.php?action=viewthread&thread_id=11809 fix about 30 issues including Render/lights, see http://revit.downloads.autodesk.com/download/2009/RAC2009_WU1_List.pdf and check for the new Enhancement list. What i can see in those images it's for example you NOT TURN ON the DAYLIGHT (windows, doors, curtain walls), in Settings you choose "Medium" then open again the windows of settings and pick in "Edit" then "Copy to Custom" in the new windows in Bottom you have 3 little boxes where if you turn on activate the Daylights, and when you say OK in the settings don't appear "Medium" but appear "Custom", if you see your 4 image you can see the "Lighting-Sheme" you choose "Interior - Sun and Artificial" but the sun light don't appear, why? because you don't activate the daylights...
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I Hope and I Wish to LEARN more, and more, and more.... REVIT |
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Joined: Tue, Oct 26, 2004
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Vicozzio, you are not as far away as you think. Try adding a few more lights to balance the spread of light a bit and adjusting them back to say 250 Watts. Adjust the time so that the sunlight is streaming through those windows late afternoon works for me. This can be done easily by doing it with sun and shadow settings in plan (try an aerial view of your model with something sticking up to act as a sundial) . The haze thing is rubbish as far as I'm concerned. I find that too many reflective surfaces made for a harsh image so bump the glossyness of paint back one or two pegs also. With sun on and at the correct angle and artificial lights on set it going again and make the adjustments in artificial light levels only and leave 'Adjust exposure' at default. Once you get it in the ball park the fiddle with 'Adjust exposure'. Also I recomend using white light from the light source (cool white) as yellow tend to beige everything and I have had enough beige.
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Turn up artificial lights ~300watts give or take and turn sun to evening 4:30,5:30, etc.....then do some exposure adjustments and you should be able to get something that works. It will definitely take some trial and error...atleast you don't have to re render with the exposure adjustments...
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Joined: Mon, Dec 24, 2007
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Hi, I am working in Revit 2009 and want to make new lighting fixture family. but after giving all the parameters its not working properly. Can anyyone help me.
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Hi, did you change/Adjust these parameters (see image attached)??? can you be more explicit? what it happens? can you put some screenshot about what are you talking???
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I Hope and I Wish to LEARN more, and more, and more.... REVIT |
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Joined: Tue, Apr 8, 2008
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in the light properties adjust the range of the light. this seemed to help me
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Figured I'd go ahead and suppliment what Mr. Spot was saying at post #3 for those of you who aren't familiar with Gimp (it's free if you don't have it). Basically, the easy way of automatically combining two rendered images. This way, you can import the exterior scene/residual light into an image rendered with the exterior lights turned off. 1. Render an interior scene with just artificial lights. 2. With the exact same resolution settings, render an interior scene with just the sun. 3. Open The Gimp and open the first jpg. 4. Open as layer the second jpg. 5. Go to Filters -> Combine -> Depth Merge. 6. Under "Source 2" select your second layer with which you would like to merge and slide the overlap to 2.0. 7. Click OK and you've got yourself a composite image of the two renderings.
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all you have to do is adjust your light properties, watts, and mainly how far your light will illuminate, i believe the default is only 10 feet. you need to adjust the illuminacy distance based on the type of light. you don't need to create multiple layers or scenes, however it will work.
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This problem is making me crazy, since the lighting is so realisitic when it's set to artificial only. I had an assignment where the students were supposed to render a space during the day and then at night... the easiest fix I could come up with is the lower the transparency of the window glass to about .09 - this seems to work well in spaces with regular windows and curtain wall. It acts globally, and since we generally have many more types of light fixtures than types of exterior glass, it was easier that adjusting light output.
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Bringing this thread back to "light". So what would be the best to adjust in regards to interior rendering with the sun and artificial settings..... the "wattage" or the "lumens"? for me adjusting the lumens works better than adjusting the watts by itself. But I need more tips from you guys. Let me know what you guys think! Thanks, - Allan
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About which to modify - wattage or lumens - I think they increasing either will have the same effect. It seems like you have to make it about 10 times whatever the original value was... Anyway, you just have to know the right units. If you have more than a few different types of luminiares, I'd recommend modifying the translucency of the glass instead. I hate it when I have to undo a change like this to make my lighting schedule look right again...
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I would not change the wattages at all. We find it best to click Type Properties->Initial Illumenance->Illumenance-> and add about ten feet to the distance we actually need to illuminate. Then, within the rendering dialog, click Setting-> Edit and copy the values from the medium rendering quality. Under custom tap, play with increasing the number of light refractions, while possibly pulling down the number of reflections. We also typically turn off soft shadows to reduce the rendering time. Render several of these on the custom tab at low resolution and when your image looks right when rendered on low, reopen the settings and turn up your antialiasing as needed and then render your final image at a higher resolution. You may have to clean up the hotspots in gimp, but this is much better than rendering two images and blending them like we used to. The following image was rendered using this method. If I find the exact render setting numbers, I'll post them.
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Thanks for your good advices. I sure will keep them in mind.
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