IES Data for carheadlight?

[hiro]

Hi,
i dont know if this the right section of the forum... so please mods, feel free to remove it!

did somebody know, where i can get ies data for car lights? front and back?

i want to try using motion blur with driving cars, so that the light of the cars will create this typial light stripes of an night shot .

did somebody did something like this?

[glass.use]

ahhh got what you mean. but i didnt ever try to simulate it,
i think its done in postwork like after effect or so probably, but maybe its possible to do it in vray

[ak-vision]

hi hiro,

had the same problem two years ago and made a contact to hella and the lightlab of the uni paderborn. They told me that they didn't work with this data format in the car lamp industrie sector. I don't know, it there is another company worldwide, who do this, but i think it is the easiest way to simulate it with some normal ies Data from a beamer with incendescant or halogen lamp for example.
Or you can use the ies generator, that tong posted here some times ago to generate a ies data by yourself.

cu
Andre

[hiro]

yes glass, i was thinkin about that last night (could't find sleep!) and i agree, in most cases its postwork.
but... i think its possble in C4d too isnt it?
you just have to place the light to the car, make the right settings for a night shot, set some frames 1-10 maybe, let the car drive its way, and render just a frame using motion blur...

ihave not much experience wtih that, but i want to try it!

[hiro]

thanks andre!

good idea, using a ies data from a beamer!
i will try this.

what do you think about this motion blur thing?

[Tong]

some help

Headlight Lighting in C4D by S.O.A.D
http://www.cg-cars.com/forum/showthread.php?t=631

http://www.turbosquid.com/FullPreview/Index.cfm/ID/374380

http://i034.radikal.ru/0711/8f/a7318eb24aa9.jpg

Hiro just simpl Q you want get this kind of effect?
http://farm1.static.flickr.com/213/452412873_7f53d0c124.jpg
or similar?

[hiro]

thanks tong,

yes this kind of effet im looking for. (without postwork)

[Tong]

sorry again, it will be animation or still image?

[glass.use]

he want it animation. this is possible in postwork just make motion follow and it will dot it easily but in c4d im trying

[hiro]

no, i want to do this in a still image.

its posibell,you have to set frames over a time period, the only things moving is the car, then u render just one frame, and you will see the motion effet.

[glass.use]

i know hiro but easy way to do it is simulate a moving car with light and take a snapshot from it not making it from nothing :P

[hiro]

yes, so we are talking about the same!
:wink:

..... i guess...
maybe..

:D

[Tong]

just thought

http://www.youtube.com/watch?v=fnMOJbX2ZC0
http://www.biomekk.com/index.php?page=1&cat=107&itm=2

[noseman]

hey hiro, you can do this with mograph's "tracer". it traces the motion path of objects over time, and you can use the created splines in a Sweep nurbs object. With a nice fresnel shader in luminance, you are there!
check this test video I did:

http://noseman.org/testrenders/punto_streaks_small.mov

[edub]

Hiro, are you talking about IES or light traces....

Correct me if I'm wrong, but IES data simulates how a light source is reflected inside the fixture, and how the resultant light spreads out from the fixture.

In my opinion you can not have the same kind of data file for a car headlight, since the light beam is refracted through multiple prisms of the glass cover. An accurate simulation would probably only be possible with caustics.

Maybe I'm totally wrong, and someone can come in and correct me?

As far as the light traces, that's a different topic, and another one I don't know about :)

[hiro]

hi all,
yes, i'm thinkinkg of light traces. (dont find the right words!)
and yes, i dont need ies data for this. i found out.
i tried it with motion blur, but it doesnt work, the blur effect is too small to get light traces.
maybe its possibel when motion blur works with a phy cam..? than you can play with shutter speed, like in reality, and maybe than you can create light traces.

noseman, thanks for the tipp, unfortunately i havent mograph! but i will have al look to your test, maybe mograph is an option for xmas! :wink:

Best Hiro

[darianr]

I know this thread is ages old, but, thought I could help.

What I do for headlight streaks is just use a luminous texture on a sweep nurbs extrusion. I know it's low tech, but it gives exactly the right look for a still image, and you can render it out super fast.

[hiro]

darianr, thank you, that sounds like a good solution! i will try this !
Best Hiro