cullen Posted May 5, 2004 Share Posted May 5, 2004 I'm new to radiosity. Usually, what I do is render with fakosity. I'm using a daylight system in MAX 6 with logarithmic exposure control. I have tried to change my setting to show as an exterior light light but then everything was very dark. The model I am using is the one provided in the thread that people showed different lighting techniques. Any help would be greatly appreciated. Thanks in advance, crw Link to comment Share on other sites More sharing options...
muzzy Posted May 5, 2004 Share Posted May 5, 2004 Have you calculated the radiosity solution ? If not, click start to calculate radiosity. What is your exposure control settings ? Try changing the brightness and contrast to %50 no exterior dayligtht checked , see what changes... If you are using IES Sun , get the intensity value of sun (somewhere around 75000-90000 ) and put that value to physical scale at exposure settings.. I hope it helps.. Link to comment Share on other sites More sharing options...
William Alexander Posted May 5, 2004 Share Posted May 5, 2004 get the intensity value of sun (somewhere around 75000-90000 ) I hope it helps.. WOW are we talking nuclear fusion or living on Mars ? Muzzy, I always thought sunlight was set in the 6-10k range? Typo or do those actually settings work? rgrds WDA Link to comment Share on other sites More sharing options...
Fran Posted May 6, 2004 Share Posted May 6, 2004 Hi Cullen, What is the reflectance value of your structure's material? Also, the default brightness setting in log. exp. is usually to high. Link to comment Share on other sites More sharing options...
muzzy Posted May 6, 2004 Share Posted May 6, 2004 WOW are we talking nuclear fusion or living on Mars ? Muzzy, I always thought sunlight was set in the 6-10k range? Typo or do those actually settings work? rgrds WDAHi Wda, I don't set it up manually. If you put a daylight, change the sun to IES. Set the time and location time 15:00 on 6/21/2004 location San Frnacisco,CA (-8 time zone) From that setting , I got 94202lx. Do you set up manually ? Link to comment Share on other sites More sharing options...
cullen Posted May 6, 2004 Author Share Posted May 6, 2004 I am actually using a standard sun. Here are my settings. I had the initial quality at 90% and my brightness at 50. My material was just the default material with its diffuse and ambient changed to white. Is there a special material type I need to use with Radiosity? Thanks for the help. settings material Link to comment Share on other sites More sharing options...
Fran Posted May 6, 2004 Share Posted May 6, 2004 Hi Cullen, First, I recommend that you use the IES Sun with radiosity instead of Standard. You may want to consider going into Customize>Custom UI and Defaults Switcher and setting the default preferences for DesignVIZ. This puts IES Sun as the default for the Daylight System. I think your reflectance value for the material is too high. In the Customize>Preferences dialog, go to the Radiosity tab and enable "Display Reflectance and Transmittance Information". In the Help doc index, go to "reflectance display" for an explanation of why this is important in radiosity. There is a brief table of average reflectance values for certain types of materials that you can use as a loose guideline. To control the relfectance value with the Standard material, adjust the Value slider in the color picker. If you are using a bitmap in the diffuse slot, control reflectance in the Bitmap Output rollout. Link to comment Share on other sites More sharing options...
muzzy Posted May 6, 2004 Share Posted May 6, 2004 Hi Cullen, What is your unit setup ? feet / meter It looks like you are using generic max units. Radiosity works with real world units and scale. Make sure that your object in right scale. Link to comment Share on other sites More sharing options...
William Alexander Posted May 6, 2004 Share Posted May 6, 2004 Hi Cullen, What is your unit setup ? feet / meter It looks like you are using generic max units. Radiosity works with real world units and scale. Make sure that your object in right scale. Yup, beat me to it. It's like my overlooking the "fc" vs "lx" (muzzy's lighting units). When I set manually the intensity to to 90,000 using American lighting units the scene will be nuclear lighting levels. Cullen you may want to look at the psuedo exposure control. This can help verify that the lighting levels are correct or incorrect. Once they are correct the logorithmic exposure is much like a camera-film speed and f-stop. rgrds WDA Link to comment Share on other sites More sharing options...
slawnick Posted May 17, 2004 Share Posted May 17, 2004 You might try unlinking the ambient and diffuse settings on your material, and setting the ambient to a dark gray. That would help somewhat to keep your white from frying out. Link to comment Share on other sites More sharing options...
waoking Posted May 31, 2004 Share Posted May 31, 2004 i am puzzled by the daylight system too . it always makes the scene very dark although i set the exposure brightness value and the sun intensity value to a high amount. Link to comment Share on other sites More sharing options...
coopdii Posted June 18, 2004 Share Posted June 18, 2004 I have the same problem, when I change my daylight to IE Sun and Sky and render my roof is black. I have my Logarithmic Exposure Control set and and Daylight check. But in Max 6 it does not have a daylight to be check. what should I do.... P.S. I am using Viz and Max.....but I perfer Max..... Link to comment Share on other sites More sharing options...
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