Any updated IES Tutorials?

[gallystops]

Has anyone found any nice IES Tutorials? I cant seem to get any quality results with the new built in IES.

[crisp109]

Re: Any updated IES Tutorials?

Watch this video.....it will answer your question and then some!

http://software.asgvis.com/index.php...tml&Itemid=625

[nomeradona_cg]

Re: Any updated IES Tutorials?

I have written a simple one here.

http://nomeradona.wordpress.com/2010...tchup-1-48-66/

[gallystops]

Re: Any updated IES Tutorials?

awesome thanks guys.

[nomeradona_cg]

Re: Any updated IES Tutorials?

at the moment you need to put millions under the power in order for IES lighting to work. I understand asgvis is doing something on this.

[dkendig]

Re: Any updated IES Tutorials?

We corrected the issue with IES lights prior to releasing the product. The issue was that the scene units weren't being used in light calculations. So if your scene was in feet, V-Ray assumed it was in meters. This would mean that a light that would decay entirely within 30 feet, would now decay in about 9-10 feet, because a foot is a little less than 1/3 of a meter.

Our IES lights should function like those found in 3D Studio Max. If you use an IES file that is set up properly, it should already have intensity information, and you should not need to adjust the "power" of the light. The power parameter of the IES light, by default is 0. This means that we will use the intensity information in the ies file. If you change the power from 0 to another value, you will be entering the value in lumens. This can be helpful if you want to adjust the brightness of a light, but it shouldn't need to be changed to just get it to emit light.

If you are using an IES file, and you can not see the light in your scene, this may be because you are using the physical camera in your render options. By default the physical camera has it's exposure set to deal with the physical sun. The physical sun is MUCH brighter than a typical lightbulb. A typical lightbulb puts out something like 1500 lumens. The sun is about 37,500,000,000,000,000,000,000,000,000 lm. So imagine the exposure on the physical camera as sunglasses. Sunglasses that are designed to help you cope with the intensity of the sun, are going to almost completely block out something as weak as a typical lightbulb.

I suggest going to lightbulb manufactuerer's websites, and see if they have any IES files available for download. That's where I always get mine from. I've had some not work too well, but you should be able to find at least one company that has some good photometric data.

[nomeradona_cg]

Re: Any updated IES Tutorials?

We corrected the issue with IES lights prior to releasing the product. The issue was that the scene units weren't being used in light calculations. So if your scene was in feet, V-Ray assumed it was in meters. This would mean that a light that would decay entirely within 30 feet, would now decay in about 9-10 feet, because a foot is a little less than 1/3 of a meter.

Our IES lights should function like those found in 3D Studio Max. If you use an IES file that is set up properly, it should already have intensity information, and you should not need to adjust the "power" of the light. The power parameter of the IES light, by default is 0. This means that we will use the intensity information in the ies file. If you change the power from 0 to another value, you will be entering the value in lumens. This can be helpful if you want to adjust the brightness of a light, but it shouldn't need to be changed to just get it to emit light.

If you are using an IES file, and you can not see the light in your scene, this may be because you are using the physical camera in your render options. By default the physical camera has it's exposure set to deal with the physical sun. The physical sun is MUCH brighter than a typical lightbulb. A typical lightbulb puts out something like 1500 lumens. The sun is about 37,500,000,000,000,000,000,000,000,000 lm. So imagine the exposure on the physical camera as sunglasses. Sunglasses that are designed to help you cope with the intensity of the sun, are going to almost completely block out something as weak as a typical lightbulb.

I suggest going to lightbulb manufactuerer's websites, and see if they have any IES files available for download. That's where I always get mine from. I've had some not work too well, but you should be able to find at least one company that has some good photometric data.

now this confused me. because i am using meters (not feet) and yet im putting millions inspite of the fact that im not using physical camera, and textsky

[dkendig]

Re: Any updated IES Tutorials?

I guess you're using bad IES lights. If you get a decent IES light, that has proper intensity set, you shouldn't have a problem lighting a room with IES lights if physical camera is turned off. As far as the scene unit bug, you may not have been effected if you used the same units that V-Ray was expecting.

I commented on this topic in another thread:

Either way, here's how it works. You choose a file name and some options, we send that information over to V-Ray, and V-Ray does the rest. This is the same V-Ray that is in 3D Studio Max, and from what I understand their IES lights work fine. We don't do anything to the IES file, and we don't tweak the settings for that light at all, it's just a raw dump over to V-Ray. So the issue is either the settings, V-Ray itself, or the IES file. The settings should be good by default, so really that just leaves the IES file itself. Does anyone use 3D Studio Max that can verify that a file works in Max and not in VFSU? Until that test is done, I don't know if we can really rely on any of the other reports we've heard.

[dkendig]

Re: Any updated IES Tutorials?

For reference, I just went and got some fresh IES files from GE's site
http://genet.gelighting.com/LightPro...ESCATEGORYPAGE

They work fine

[nomeradona_cg]

Re: Any updated IES Tutorials?

For reference, I just went and got some fresh IES files from GE's site
http://genet.gelighting.com/LightPro...ESCATEGORYPAGE

They work fine

ok let me do some more test. maybe is the ies data now sure..

i will test this ies light both with vray max and vay su..

[dkendig]

Re: Any updated IES Tutorials?

Please let us know what your findings are. We've gotten such mixed feedback about the IES lights, it's really hard to make heads or tales of it. The only thing I've been able to fully rely on, is when I test it myself. The problem is that I'm not really the best at actually using this program, just as all of you probably aren't really all that great with the programming aspect of the plugin. Different worlds. So in my humble tests, using a variety of IES data, I've found that the lights work fine sometimes. I have found quite a few IES files that haven't produced anything in a scene until the power was set to something outrageous. I would really like to put the issue to rest and finally know what in the heck is going on.

[sirpinel]

Re: Any updated IES Tutorials?

the video where is shown how to use the IES,

http://software.asgvis.com/index.php...tml&Itemid=625

is used in an IES GE

http://genet.gelighting.com/LightPro...ESCATEGORYPAGE

or another site?

[Constable lord Falklaroy]

Re: Any updated IES Tutorials?

or another site?

I say good sir, try this one, http://www.google.com

[sirpinel]

Re: Any updated IES Tutorials?

I say good sir, try this one, http://www.google.com

Speaks of the mustache! Very good this site you recommended me!
Just wanted to know if the IES was utilzar is of GE or of other manufacturer! Understand?

I do not speak English well... Maybe that's why did not understand what I asked.

[dkendig]

Re: Any updated IES Tutorials?

IES files are photometric data files. You can create them yourself, but if you're looking for a physically accurate light source, I would recommend looking for IES files that are created by light bulb manufacturers like GE, Sylvania, etc.