Corona Renderer Forum

General Category => I need help => Topic started by: petoboso on 2014-05-28, 21:53:25

Title: Radial anisotropy, weird result.
Post by: petoboso on 2014-05-28, 21:53:25
Hi, im trying create radial anisotropy like i usualy do http://i.imgur.com/man06.jpg
but corona give me weird results.
First render is only with bump texture without anisotropy (like in reality, and what i need achieve)
second is anisotropy with rotation texture. i was trying many combination of values.
(http://i61.tinypic.com/2w6t47d.jpg)
(http://i60.tinypic.com/21d1j75.jpg)

material setup:
(http://i61.tinypic.com/20zwk0o.jpg)

Is it bug or i am doing something wrong?
Thanks
Title: Re: Radial anisotropy, weird result.
Post by: Ludvik Koutny on 2014-05-28, 22:07:56
AFAIK Corona does anisotropy only in world space. Not UV space. I think i mentioned to Keymaster that UV based anisotropy will be needed as well, but i guess it got forgotten.

Best way to achieve UV based anisotropy at the moment would be using actual bump map :)
Title: Re: Radial anisotropy, weird result.
Post by: petoboso on 2014-05-28, 22:27:17
thanks for reaction, yes it will be needed, mention to him again :)
Title: Re: Radial anisotropy, weird result.
Post by: oncire on 2015-03-18, 03:30:51
just want to up this thread... is there a proper workflow for creating anisotrophic reflections in corona?
Title: Re: Radial anisotropy, weird result.
Post by: maru on 2015-03-18, 09:36:42
I think this is still valid:
AFAIK Corona does anisotropy only in world space. Not UV space. I think i mentioned to Keymaster that UV based anisotropy will be needed as well, but i guess it got forgotten.

Best way to achieve UV based anisotropy at the moment would be using actual bump map :)
Title: Re: Radial anisotropy, weird result.
Post by: oncire on 2015-03-18, 18:00:47
i see... so its not yet fully implemented
Title: Re: Radial anisotropy, weird result.
Post by: adamaf on 2015-03-19, 11:02:48
I made this fairly easily with geometry. Just a slightly rough metal material.
Title: Re: Radial anisotropy, weird result.
Post by: oncire on 2015-03-19, 11:12:48
I made this fairly easily with geometry. Just a slightly rough metal material.

nice image... any tips on how you did it?
Title: Re: Radial anisotropy, weird result.
Post by: adamaf on 2015-03-19, 11:40:24
I modelled the grooves.

I know not the ideal solution to all objects that need anistropic reflection, but this was going to be viewed quite closely and it didn't actually take much effort.

I'll try and find the model and post it when I get home later.
Title: Re: Radial anisotropy, weird result.
Post by: adamaf on 2015-03-19, 14:17:47
Here's the model if it's useful to anyone.
Title: Re: Radial anisotropy, weird result.
Post by: agentdark45 on 2015-03-19, 15:53:35
I made this fairly easily with geometry. Just a slightly rough metal material.

That's pretty cool man, could the same effect be achieved with a high res normal map?
Title: Re: Radial anisotropy, weird result.
Post by: adamaf on 2015-03-19, 16:12:49
I don't see why not. Give it a try!
Title: Re: Radial anisotropy, weird result.
Post by: Juraj Talcik on 2015-03-19, 18:34:45
I made this fairly easily with geometry. Just a slightly rough metal material.

That's pretty cool man, could the same effect be achieved with a high res normal map?

I use this one (attachment) and...honestly, it samples badly. From distance looks like some noisy mess...samples forever esp. in interiors, and from close-up...I guess ok but it's hardly perfect.
This is the one thing where adaptivity would help greatest, but also some improvement for micro detail bump maps sampling like that recent research paper that was posted here.
Title: Re: Radial anisotropy, weird result.
Post by: PVDHP on 2015-10-03, 15:31:59
It just doesn't work even with model adamaf gave us? I wasn't able to do a good anisotropy with mental ray, and corona, but it was very easy to do with vray. What I'm doing wrong?
Title: Re: Radial anisotropy, weird result.
Post by: maru on 2015-10-05, 12:44:08
In the newest daily builds anisotropy is handled a bit different and it has two modes - local and uvw. You can check it out. Here is a comparison:
Title: Re: Radial anisotropy, weird result.
Post by: telemix on 2015-10-05, 21:12:34
In the newest daily builds anisotropy is handled a bit different and it has two modes - local and uvw. You can check it out. Here is a comparison:
Good news, it is very necessary. –źnisotropy can not be used properly without local space mode. This is especially important for the animation.