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Kerkythea Rendering System • View topic - New wood materials
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New wood materials

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patricks

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Post Wed Jun 13, 2007 12:56 am

Darren ...please have a look at this new threat and make the appropriate changes to your materials if you want to be sure that they will work correct in all situations ( and avoid energy conservation problems) :wink:
thanks :!:

http://www.kerkythea.net/phpBB2/viewtopic.php?t=2893

Greetings Patrick
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sintra

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Post Wed Jun 13, 2007 7:35 am

Hi Patrick,

Thanks for your input on this one :D

I will try and make the changes to the materials and post the revised ones shortly.

Just out of interest what problems would occur with the materials as they are at the moment.

Kind regards

Darren
Kind regards

Darren

Sketchup6 & Kerkythea
Dell Precison M90 notebook, Intel Core 2 Duo 2.33 Ghz, 4Gb of Ram, nVidia Quadro FX 2500M

Image


http://www.flickr.com/photos/darrengoodwin/show/
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patricks

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Post Wed Jun 13, 2007 8:31 am

Hi Darren

some of your materials violates the energy conservation law and that can lead to fireflies with unbiased render methods and blotches with PM & FG ( it will not happen necessarily but there is a potential risk )

you have added with the diffuse component also a specular value as one material component ( you used a bitmap in the specular channel and a diffuse color bitmap as one material component + a small reflection value = 0.100 ( perfect reflection ) remember that even you dont turn specular sampling on , when using MLT or any other unbiased render method , the specular sampling is turned on automatically by KT :!:
this material component already can violate the energy conservation law because we actually dont know the diffuse bitmap value ( even if the bimap is a dark color , in case of a lighter one the problem is bigger)
this is one reason why the diffuse and the specular component should always be a separate material component .

you also give to the specular component again a 0.100 perfect reflection intensety making the total amount of specular and reflection = 1.100 ( energy conservation violation ) .....

A good strategy is to make the materials in a way that even you change your diffuse bitmap to any other color, the material will work correct .

i hope this can help you

Greetings Patrick ( i also see that you use the ambient color with a bitmap with the diffuse component ..... there is no need to use ambient color and if sombody turn ambient on for rendering , he can have a bad surprise when using your wood material )
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sintra

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Post Wed Jun 13, 2007 8:38 am

Hi Patrick,

Thanks for the info :D

So basically if i use the materials you posted earlier as a base and change the maps then they will be physically correct ?

Kind regards
Kind regards

Darren

Sketchup6 & Kerkythea
Dell Precison M90 notebook, Intel Core 2 Duo 2.33 Ghz, 4Gb of Ram, nVidia Quadro FX 2500M

Image


http://www.flickr.com/photos/darrengoodwin/show/
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patricks

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Post Wed Jun 13, 2007 8:47 am

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sintra

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Post Thu Jun 14, 2007 5:25 pm

Hi All,

I have been making some alterations to the wood materials to make them physically correct so here are the links to the revised materials.

If you've downloaded the previous version, please delete these and replace them with the new library.

You can download the new library at our repository.

Cheers
Kind regards

Darren

Sketchup6 & Kerkythea
Dell Precison M90 notebook, Intel Core 2 Duo 2.33 Ghz, 4Gb of Ram, nVidia Quadro FX 2500M

Image


http://www.flickr.com/photos/darrengoodwin/show/
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Frederik

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Post Thu Jun 14, 2007 9:39 pm

The new Wood Material library is available for download . ;)

Thanks for sharing, Darren! :D

Cheers
Kim Frederik
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Silke

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Post Fri Jun 15, 2007 5:35 pm

~Lady Silke~
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Negcx

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Post Wed Jan 27, 2010 2:03 am

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dr_dunno

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Post Wed Jan 27, 2010 9:12 am

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Frederik

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Post Wed Jan 27, 2010 9:32 am

It can also be a problem with the file-name, folder and/or path where your textures are located on your computer... :|

Please note that you need to use standard Englich characters (A-Z and 0-9)...
If the file-name, folder and/or path contain any non-English standard characters, KT won't be able to recognize it... ;)
Cheers
Kim Frederik

“…When a decision is made it’s important that you implement it quickly.”
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arch09

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Post Fri Feb 19, 2010 6:48 am

<<

tatochu

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Joined: Mon Jun 10, 2013 2:11 am

Post Wed Aug 21, 2013 4:29 pm

Re: New wood materials

why cant i download a lot of materials u uploaded??? in register here.... i dont understand... how can i login in the repository ??? please help !!

Thank u!
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notareal

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Post Thu Aug 22, 2013 9:14 am

Re: New wood materials

Thea Render and Kerkythea Rendering System, by Solid Iris Technologies
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notareal

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Post Thu Aug 22, 2013 9:14 am

Re:

btw, If you got a non working link with ../phpBB2/.. replace it with ../forum/..
Thea Render and Kerkythea Rendering System, by Solid Iris Technologies
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