Max 2009 Lighting Analysis

Posted on: Ağustos 28, 2008

If you haven’t played with Max 2009’s new lighting analysis tool, it’s definitely worth checking out. For this blog I will briefly explain how to use it.

Before I jump into lighting analysis, I have a disclaimer for lighting studies/software. When it comes to lighting analysis, the results are just estimates on how much lighting a space is receiving. There are too many physical factors to be accurate. Materials have to act exactly as they do in reality to bounce light properly. This includes physical characteristics as index of refraction/reflection, caustics etc. Max does a pretty darn good job at simulating these though, so good infact that it is recognized by LEED as program for obtaining lighting analysis credits.

With that said, here is a quick look at how we set a scene up. Firstly, be sure the space you are modeling, is as accurate as possible. The windows need to be the right size, and there cannot be any openings in the space other than the windows. Secondly be sure that the materials you are using are either all ProMaterials or A&D materials, and they act as the material would in real life (tile being reflective, gyp being non-reflective, etc). One of the most important materials is the glass, because it will determine how and how much light will enter the space. The way the glass is modeled is important as well. Be sure your glass has a thickness. Usually the A&D material or ProMaterial Glazing will attenuate light properly for each polygon that is traversed, without refracting it. Thirdly, the lighting must be accurate and represent true-life physical amounts. Creating a Daylight system is the best way to achieve physical properties for your sun, just don’t mess with the multiplier amounts. If you also want to include light fixtures the best type of light for this are photometric lights. Typically only FG should be used, and can be used in conjunction with the light portals. For accurate fc or lux amounts it is important to increase the number of FG bounces. 4-8 bounces is acceptable.

Once you have your scene set up, in the menu under”Lighting Analysis” use the “Lighting Analysis Assistant.” Basically this box checks your scene to make sure that you don’t have any un-natural materials or lights. If you do, it will tell you how many materials and lights need to be tweaked. The “Analysis Output” tab is where you can create a light meter. The Light Meter is just a plane that record light data in the scene and spits out numbers of light intensities (measured in foot candles fc or lux). In the US everyting is measured in foot candles, so I use fc. The modifier settings for the light meter controls the amount of segments, orientation arrows, type of illuminance, and it can export the numbers to an excel csv file.

For the lighting analysis, you will only get figures for where the planes are. So if you need all four walls of room, you will need 4 light meters, one for each wall. Note: the lighting analysis is no gauge on how the scene will render. Much like a camera, you can make a very dark room appear light with the right exposure settings. The exposure settings also don’t have any effect on the lighting analysis since these numbers are fixed amounts of energy.

For much more detailed information you can check out the Autodesk whitepapers posted by Pierre-Felix Breton.

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