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mirror F-stop
Posted: Wed Feb 18, 2009 5:24 am
by Jambert
Hi all
I think there is a problem with miror and focus distance
miror: ior 100, exp 1000000 or al.nk (in database)
F-stop: 128
http://www.indigorenderer.com/joomla/co ... temid,107/
I have other scene with the same problem
thx for reply
(Iuse blendigo 1.1.14 and last indigo 1.1.16)
Posted: Wed Feb 18, 2009 8:15 am
by Schosch
The IOR of aluminium is 1.59, not 100!
Use the al.nk data (which is included in every package of indigo) and an exponent of 1,000,000.
BTW you can find a huge list of IORs at
http://refractiveindex.info/
Posted: Wed Feb 18, 2009 8:24 am
by Camox
I use this material for mirrors and it works fine ! I dont think thats a problem with the fstop, your ior is to low. I hope its help...
Code: Select all
<scenedata>
<material>
<name>nullMat</name>
<null_material />
</material>
<material>
<name>mirror</name>
<phong>
<ior>10000000</ior>
<specular_reflectivity>
<constant>
<rgb>
<rgb>0.827 0.788 0.737</rgb>
<gamma>2.2</gamma>
</rgb>
</constant>
</specular_reflectivity>
<diffuse_albedo>
<constant>
<rgb>
<rgb>0.827 0.788 0.737</rgb>
<gamma>2.2</gamma>
</rgb>
</constant>
</diffuse_albedo>
<exponent>
<constant>10000000</constant>
</exponent>
</phong>
</material>
</scenedata>
Posted: Wed Feb 18, 2009 11:05 am
by CTZn
Though the simplest way is to use a non-transparent specular, because it has no exponent at all, or a really infinite one if you want to say so. In that regard it will be also faster to render I believe.
IOR does the reflections, both for phong and specular materials. You want to push that one very high like camox is showing.
edit: that said I would give <specular_reflectivity> a try, never did. And perfect mirrors have no diffuse component, another reason why to prefer specular material imo.
Posted: Wed Feb 18, 2009 11:21 am
by Jambert
Schosch
I know it thanks, I tried with ior 100 and with nk, two different material with exp 1 000 000
sorry it was clear
CTZn
Thanks, I will try it but it quite strange, real mirror are made with aluminium
Posted: Wed Feb 18, 2009 11:29 am
by Jambert
CTZn
It works
, do somebody know if it's possible to change no trasparent glass color??
Posted: Wed Feb 18, 2009 11:36 am
by CTZn
Only by blending if you use specular, but you'd better use camox's material for that matter
Posted: Wed Feb 18, 2009 10:02 pm
by Jambert
Camox
Soory camox I didin't see your answer
Ok so I understand, the problem is blendigo, ior 100 is max
Thx all for reply