Download Trial Buy now

Search  | Login  | Register

Post new topic Reply to topic  [ 10 posts ] 
Offline
User avatar
Hey guys!

Okay, havent used indigo for a loooong time so im back to the basics...

Basically im trying to get an effect similar to the way fiber optics work but with a much wider "wire" if you will. I hope the images below can describe it better for me! :oops:

Attachment:
File comment: Before render. The "pole" is going through the wall and im hoping for it to transfer the daylight form outside.
Screen shot 2011-05-23 at 21.04.19.png
Screen shot 2011-05-23 at 21.04.19.png [ 34.82 KiB | Viewed 599 times ]


Attachment:
File comment: But the light doesnt seem to diffuse very strongly, and the glass is almost invisible.
Screen shot 2011-05-23 at 21.04.25.png
Screen shot 2011-05-23 at 21.04.25.png [ 128.34 KiB | Viewed 599 times ]


Any help would be amazing!!

Thanks! :D

_________________
Theres no stopping the cole train baby


 Profile  
 
Offline
User avatar
Hi rhibee

Are you using some scatering material ?

Using an ideal optic fiber in vacuum one wouldn't se light wiithin because photons would entirely be reflected to the other hand and run away unstopped. You need some scattering either within the tube or the room or both. Besides, you mat need a longer tube in order for TIR to take place efficiently (greater length/radius ratio).

See those two to get the idea:

http://www.indigorenderer.com/materials/materials/121
http://www.indigorenderer.com/materials/materials/125

You'll have to change the IOR for the conductor. In both cases you can set absorbtion to zero just to get the effect.

_________________
5000km away from his computer. the guy has a stupidSpy under Android.


 Profile  
 
Offline
User avatar
Hi, thanks for the reply! :D

Im really sorry about this but could you explain in MEGA simple terms please? im completely new to glass rendering that isnt a window :lol:

would turning on the fog in sketchup work as a scattering material?

and how on earth do i set the absorption to 0? :? all i can find is a colour chart... do you mean set the rgb settings for the absorption to black?

Sorry if i sound a lil frustrated, im currently trying to also figure out why my glass is suddenly black :/ normals all facing outwards, glass has volume, is a single entity; even used a preset glass texture and still not working :cry:

not a good day im 'fraid!!

_________________
Theres no stopping the cole train baby


 Profile  
 
Offline
User avatar
PS

The image above is using the setting "thin glass" for the glass tube. if I set it to anything such as specular with transparency its even WORSE....

_________________
Theres no stopping the cole train baby


 Profile  
 
Offline
User avatar
Developer
rhibee wrote:
PS

The image above is using the setting "thin glass" for the glass tube. if I set it to anything such as specular with transparency its even WORSE....


the "thin glass" does not do TIR, you need to use a specular material with a medium.


 Profile  
 
Offline
User avatar
Developer
Also, in this scene you might want to use MLT.


 Profile  
 
Offline
User avatar
ah okay then ill try and have another fiddle around with specular materials. Thanks :]

MLT doesnt seem to be a help though... just get this

Attachment:
File comment: Yuk!
Screen shot 2011-05-24 at 11.55.22.png
Screen shot 2011-05-24 at 11.55.22.png [ 79.63 KiB | Viewed 529 times ]

_________________
Theres no stopping the cole train baby


 Profile  
 
Offline
User avatar
Developer
I made a scene like yours and only Bidir seems to work best.

Here is my result (very quick render):
Attachment:
light tube.png
light tube.png [ 1.17 MiB | Viewed 529 times ]


pretty cool effect!

What I can tell you from my experience with it:

- make sure the walls have a thickness, otherwise light will leak in.
- use a specular material with ior ~1.6, do not use absorption (leave default setting, which should be no absorption)
- use bidir (maybe with MLT)

And thats about it :)


 Profile  
 
Offline
User avatar
Developer
Also, the faces of the tube and the faces of the wall shouldnt overlap. Make sure your actual tube has a little bit smaller radius than the one used for cutting the hole into the wall


 Profile  
 
Offline
User avatar
Its working!!!! I dont know what it was but a combination of all of those worked :D Thankyou so so much guys!! ^.^

_________________
Theres no stopping the cole train baby


 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 



You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group