[Maxwell] Need help with emitters
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I'm new in this forum and i'm using maxwell for quite some time, usually to render exteriors i would like to know more about the emitter.
I usually use standard emitter. Whats the difference in the luminance option? (Power, Lumen, etc)
I saw in this threadhttp://www.maxwellrender.com/forum/viewtopic.php?p=353538#p353538The image is awesome but i think he's only using standard emitter (not ies) especially for his "Corner Stone" emitter. Is it possible to achieve ies looking emitter with non-ies emitter to create a lighting bias?
And if i try to use ies emitter on a plane or sphere if somehow it will go black if im not facing from where the light from. but there still light its just the plane is going black like this
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True emitters emit light from their surface(s) based on the normal direction (front side of faces in SketchUp).
IES materials are not true emitters -- they must be applied to a small sphere and the sphere itself will not emit light.
The reason is: IES is not a light so much as a recording of a real-world lighting fixtures falloff -- that recording was made inside a sphere filled with sensors. So we use a sphere to "play-back" the recording of the original lighting fixtures falloff.
Because of this IES "lights" are best used off-camera -- where you can see the results of the lighting fixture, but not the fixture itself (which does not exist). If you intend to use the IES on-camera then you will need to do some trickery/extra work with another emitter to "fake" things to "look right". However, in Maxwell the intention is when you need to see a light fixture on camera it should be fully modeled and made with appropriate materials (meaning emitters/reflectors/etc.)
The advantage of IES is it will render faster (Maxwell does not need to calculate extra bounces, etc. due to fixture geometry) and still provide the complex falloff characteristics of a fully modeled light fixture -- so they are useful, but like I said, use them off-camera.
There are a ton of IES threads on the Maxwell forum and you can easily find them by doing a search.
Best,
Jason. -
Thank you for the reply, so ies is best off camera and we use standard emitters as camouflage for the lighting. 1 more question is it possible to use standard emitters (wihout ies) lighting bias to be like emitter with ies? e.g. i create a plane near wall but i want the lighting reflection at the wall be like ies lighting
Sorry for my english
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Everything in Maxwell revolves around geometry -- so if you create the emitter in such a way that the geometry dictates the light will falloff in a specific way, it will.
That said, the converse is also true, Maxwell is Unbiased and as a result there are not many non-geometrical ways to manipulate light direction/bounces/shape.
Probably the only extra thing to say here would be that you can use a greyscale texture to mask anything (including an emitter). This can fake the appearance of a light that would be difficult or impossible to model (for instance, you can achieve soft-box effects using a simple plane with a masking texture on the emitter).
Best,
Jason. -
thank you very much jason that clarify everything i wanna know
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I think i have another problem with ies. So i copy the file IES Tester by Jason from another thread and i still dont understand how u/he can do that. my problem is when i making something from scratch and using ies with intensity set to 1 it looks very dim. but when i use FIRE in jason's file its quite bright with intensity just 1.
So i open jason's file, then making a new sketchup file, then copy all objects from jason's file to the new file. but when i use FIRE in my new file the ies is still very dim in ies intensity 1. i have to set around 100 to make it quite bright.
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The cameras of the two scenes have different exposure values (EV)...
- fstop 5,6 and shutter speed 1/1,02 = EV 5
- fstop 5,6 and shutter speed 1/522,45 = EV 14
Maybe you should first learn the basics of maxwell and photography
http://support.nextlimit.com/display/maxwelldocs/Camera+parameters
http://en.wikipedia.org/wiki/Exposure_value -
thank you very much, i still need a lot of study for maxwell and 3d modelling. so another question is there any good free application like UVMapper?
or any plugin that have the same intention to uv mapping? -
Have you tried ThruPaint?
http://sketchucation.com/forums/viewtopic.php?f=323&t=44552
or as unwrapping solution a commercial plugin: SketchUV
http://sketchucation.com/forums/viewtopic.php?f=323&t=44501
I use ThruPaint and it works great for me. But all faces have to be quads for some tools.
And you should enable "Ignore Distortion" For groups/components who contain ThruPaint mapping otherwise the maxwell plugin will export one per quad face!
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