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Forums >> Revit Building >> Technical Support >> Daylighting Analysis Help-Revit into 3DS Max
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Joined: Wed, Feb 20, 2008
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Hello,
I am using a Revit FBX export in order to run daylighting calculations in 3ds Max and have a few questions if you all would be so kind to help me out.
I have went through 2 or 3 tutorials and even took an online class on the Daylight Analysis feature that is on 3DS Max and still have a little confusion on it.
Whenever i set my materials i give everything that actual reflectance it should have just like the material should have. I do this in Revit and so that whenever i bring the model into 3DS the materials are already set. I double check the materials in Revit so that I am able to confirm that the materials have held their properties once imported.
After I use my light listers and layout my grids and so-on, I notice that my readings are sort of inconsistant. As you can see on the attached image there are a few readings that are very far from the windows that have bight spots or high readings. Even though they are at the back of the room and there are no other light sources close it reads like this.
We used another lighting program before to run this type of calculation called AGI which would give an even and gradual decrease from the area in the room nearest the light source to the farthest point in the room away from the light source.
With these inconsistance points, it has caused some doubt in the office about the reliability of 3D Max in regards to Daylighting Calculations. Can anyone tell my why this is the case that the light meters are giving my inconsisant readings? For what its worth my FG is set to 7 just as a test.
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Joined: Tue, Jan 16, 2007
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wow thats some seriously high numbers. what are you using as a light source? its hard to tell from the image but my first guess would be you have some sort of light leak from the building or perhaps there is a high reflective material that is causing some light bounce. I have been using max daylighting analysis since it came out for LEED EQ credits and find it to be extremely accurate
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The surfaces are very reflective. Our gypsum has an 83% reflectance. Our ceilling has a 85% rflectance and the VCT flooring has a reflectance that is 63% reflective.
We have 4 windows that are 8 ft tall with light shelves, sunshades, and the classroom has sloping ceilings that slope from the window side of the room to the rear of the room that is oppisite of the window side.
Now do you think it sounds right?
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The only light source is the sun which is set at noon on March 21 which is what is required by LEED.
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you need to download the epw for your project city and then run the analysis again. im guessing those reflective materials are the culprit. have you done and renders to see if you get hot spots? you should be able to turn your glass into a flat material and all your numbers return 0. if not you have a geometry problem
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I downloaded the EPW yesterday. So you do think something is wrong then? I have the glass set at 2 layers with 11 % reflectivity.
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try placing planes over the glass or change your class material to be non transparent. then you should have 0 fc on all your meters. you are gonna have to eliminate possiblities one by one
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Changed the glazing to 0 transparency and that gave readings of 0 fc in the room, so there appears to be no light leaks. Just odd that the numbers would spike like that instead of having a gradual decrease all of the way to the rear of the room.
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well that is good news, now with your glass material set back to its normal settings try rendering a camera of the interior and see if you are getting any major reflections in those specific areas.
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