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Tue, May 6, 2008 at 3:09:00 PM | Rendering And Light Settings Revit 2009

#1

R7oky


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Can anyone help me on the setting to use when rendering in 2009, the main problems im finding is when rendering internal images with artifical lights the white plaster walls are coming out quite yellow / orange rather than white?

Also it only get light if i use artifical light only, as soon as i change setting to internal artifical and natural lighting the internal lights apeared to be switched off and all apears very dark.

If anyone could help me out with rendering settings it would be great.

Many thanks


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Tue, May 6, 2008 at 3:26:16 PM | Rendering And Light Settings Revit 2009

#2

JAMESHGRIMES


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I had the same issue. I was able to adjust the Exposure settings (White Point and Exposure) to get a little closer to what I was needing. I haven't been able to get time to do some real testing though. If anybody else out there has a solution, please respond, because I am needing to know what to adjust.


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Tue, May 13, 2008 at 3:47:35 PM | Rendering And Light Settings Revit 2009

#3

JustinT


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No sure what could be causing this... my scenes render fine.. but are there any surfaces that would be reflecting the tint back onto you white walls?

You could try opening up the actual light family and checking the colour of the light source as well... don't forget the new lights can actually emit coloured light now and depending on the the type of light source.... just a thought.

Justin

 


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Wed, May 14, 2008 at 3:42:35 PM | Rendering And Light Settings Revit 2009

#4

cpetrick


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The artificial light sources are not working for me either.  If sun and artificial setting is used, the scene is black with very dim lights.  The fixtures are gray in colors as if they are on, but have no light output. There are numerous other threads on problems with lights not working.  Something is not working.

Thanks


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Wed, May 14, 2008 at 4:58:47 PM | Rendering And Light Settings Revit 2009

#5

cpetrick


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Regarding the warm yellow tint of the scene.  After you process the render, use the 'Adjust Exposure..' button to test white balance, levels, and exposure settings.  The settings in here all take affect without re-rendering. 

You may want to change the 'initial color' parameter of your light source as well.  Edit the light families in your scene and change the temperature setting for the light.

It is possible that JustinT is correct and you may be getting some color relfections, but this would probably be more subtle than what you describe unless you have a highly reflective surface.


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Wed, May 14, 2008 at 5:28:34 PM | Rendering And Light Settings Revit 2009

#6

JustinT


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What happens if you create a new file with just 4 walls, ceiling and floor.. make all the materials white and then place a single light source and render... do you get the same tinting? take the attached image.. the scene on the left was rendered in 2008 and the one on the right in 2009.. the difference is due to the actual light family, now the lights have more settings i.e. colour so that they give off a more realistic light i.e a lamp of low wattage has a more yellow light. Accurender only ever gave us white light.. I think it could be down to this.

 Justin

www.revitup.co.za



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Wed, May 14, 2008 at 6:06:02 PM | Rendering And Light Settings Revit 2009

#7

mthurnauer


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Light color is a real-world thing that I think should not be used except in special instances for rendering.  The reason I say this is that your eye will adjust to interperet color so that things appear 'normal' as if the main light sources are providing white light.  we only percieve the color of lights that contrast the main light sources.  I.E. a wall sconce with warm light.  rendering with light color usually creates renderings that don't appear natural.

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Wed, May 14, 2008 at 6:12:20 PM | Rendering And Light Settings Revit 2009

#8

JAMESHGRIMES


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This is a good thread. I will do some playing around with the different settings. I am confident I can get the result I'm looking for with a little testing. Thanks to all who has posted so far.


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Thu, May 15, 2008 at 7:48:48 AM | Rendering And Light Settings Revit 2009

#9

JustinT


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Mmmm this colour issues... I'm not a 'lighting engineer' but different lights do throw out varous colour shades within the colour spectrum and now in Revit 2009 we have the same settings as we have had in Max and Viz for a while i.e. a light emits colour based on the type of unit i.e Xenon, Incandescent, Sodium etc.

In my previous post I didn't mean that the Colour Filter option be used (this allows you to output with pure colour to produce effect such as colour spots etc. which previousl required the modelling of a coloured buld around your light source - a real pain in the ..... now we can just set the colour which is much faster) what i was trying to point out was the type of light source which also alters the light colour:

If you look at a street light the glass is not coloured, it's the light unit i.e the gass etc that give the source it's colour range and warmth e.g. street lamps tend to be yellow / orange or a pinky red colour.

Halogen lights for security and those little spots we all love in bathrooms and kitchens are very intenses and white in colour.

I think that the new light sources in Revit 2009 do give a more realistic lighting than previously in accurender. But that's my opinion. If I model my own lounge up and place the new lights in, then to me it matches the room far better in the lighting, that if i use Revit 2008.

Take a look at the new settings, that lights can have in R 2009. try different colour presets and see what you think.

Finally if you download any of the IES files from companies such as Erco etc, then this also (I believe alters not only the lights web / falloff etc, but also the colour.

Any more info' on this would be welcome from us all I think... any lighting engineers out there?

 Justin

www.revitup.co.za



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Thu, May 15, 2008 at 12:51:31 PM | Rendering And Light Settings Revit 2009

#10

mthurnauer


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I understand what is meant by the light color, but this has always been a tricky issue when it comes to computer visualization. It is essentially the same issue as why it is difficult to represent natural daylight at the same time as artifical light.  There is far less range in pixel intensity than actual range of light levels and to represent this in an image requires the use of exposure correction to make light levels appear correct to the viewer.  One example of this is the creation of the HDRI file type; what appears white in a photograph can have a huge variation in intensity that normal image types cannot document.  The way all of this relates to the issue of light color is that just as intensity is subject to the perception of the viewer, so is light color.  If you place two light boxes next to each other and have a light in each one with a different light color, the viewer can percieve the difference, but if you only experience one at a time, the viewer will interperet them the same.  For example, most people have incadescent lights in their home, but do you feel that your home environment is very yellow as is portrayed by a rendering?  No.  It seems that the solution to this issue would be that there should be a post-process color corection just as there is an exposure correction.  It could have presets based on the color teperature of various light sources.

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Thu, May 15, 2008 at 6:56:39 PM | Rendering And Light Settings Revit 2009

#11

JustinT


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Ok I am beginning to understand about how we perceive light in that we can't tell the difference or rather we don't perceive a difference if we are sat in our lounge etc. but if we take this a step on and bring our Revit model into Max Design 2009 and look at the lux levels - then what are these based on and does the colour ot type of light alter this? I'm no light expert, but when if we are to move forward with 'green design' then understanding the lighting levels etc is very important and is more than just a pretty picture.

So I guess my question now would be should we be using actual light types? or not if we want pretty pictures do we just use white light so our scenes are not  tinted, but then if we want to take BIM to the next level should we be selecting incandescent, sodium, halogen etc?

This is a very good thread and I would love to understand more about lighting and how Revit and Max can be used by my clients.....

Justin


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Thu, May 22, 2008 at 9:30:35 PM | Rendering And Light Settings Revit 2009

#12

JAMESHGRIMES


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JustinT,

Great post. I adjusted the Inital Color in the lighting families then matched the White Balance in the Exposure Settings and it came out perfectly. Thanks again for the suggestions. I am now a believer in the Mental Ray Rendering in Revit 2009.


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Wed, Jun 18, 2008 at 12:55:03 AM | Rendering And Light Settings Revit 2009

#13

jeffrb25


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I just viewed this thread for the first time and have utilized some of what has been suggested to clean up the yellow effect of the renderings.  The comments did although forget to address the issues regarding interior scenes with both natural (sun) and artificial light is specified.  My scenes end up dark still.  Any thoughts as I am hoping to do some rendered walk throughs and the interior and exterior lighting should both be on.

 Thanks


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Fri, Jun 20, 2008 at 8:49:15 AM | Rendering And Light Settings Revit 2009

#14

Elmo


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Jeff the Interior exterior internal setting is bugged. You need to download the service pack listed here in Revit City which should fix the issue.

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Mon, Jun 23, 2008 at 9:49:39 AM | Rendering And Light Settings Revit 2009

#15

R7oky


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Elmo, Have you got a link to the service pack that needs to be downloaded please? Many thanks

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