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Difference between Fresnel and Reflective leve
show user profile  coolamigo
Hello all,
Really cant understand how I can upload images to show results but am getting quite the same output when I set Fresnel Refl. to 3.6 or gray level of Reflect to 92. I have read the theory but in practically Fresnel seems to be another way to do what Reflect color can do.

Also, while diffuse colour of object has much different affect than Reflect colour but I cant understand what sence it should make and when to use which??
read 932 times
7/16/2013 11:43:15 AM (last edit: 7/16/2013 11:43:15 AM)
show user profile  Sir_Manfred
Googled and found this for you :) http://veprikov.blogspot.se/2011/06/reflections-fresnel-effect.html



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read 920 times
7/16/2013 11:49:17 AM (last edit: 7/16/2013 11:49:17 AM)
show user profile  coolamigo
Thanks Sir
I really appreciate the time you gave for this!
Well I do admit it is a very good explanation though I would first recommend new users material from VRay documentation but that's a matter of choice of course.

What I am looking for is specifically the comparison. What can't be done with Reflection value and we must have Fresnel for that?

The examples given athttp://www.vray.com/vray_for_3ds_max/manual/vraymtl_examples.shtml

show wider reflections, in essence we appear to be only increasing reflectivity of material which we can also do by gray level of reflection!
read 874 times
7/18/2013 7:51:36 AM (last edit: 7/18/2013 7:51:36 AM)
show user profile  Nanne
Frenel is the effect that the reflection strength depends on the viewing angle. The reflection right infront of you is less then the reflection at an 90 degree angle of the object, in relation to the camera/eye.

A lot of people say "most materials have Frenel Reflection"... What materials does not have it, I would like to know... I never heard of any... In short; always use Fresnel.

The reflection colour is like an overall reflection strength, ranging from 0-100% (from black to white). Use something like 10-90% for your materials. No material is ever 100% reflective nor can they be 0% reflective (well, black holes perhaps...).

Only metals has got reflective colours. Not painted metals like cars, they have a coating layer with white (light grey) reflection colour; sometimes there's metal flakes in the paint though - metallic paint. But proper coloured metals such as gold, copper, brass etc. has got coloured reflections. A tip: use the same colour for Diffuse as for Reflection on metals, but turn the brightness of the Diffuse colour down to around 5-10%, makes it look rather nice.

Correct me if I'm wrong on some points :)

Kristoffer Helander
www.kristofferhelander.se
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read 846 times
7/18/2013 2:08:09 PM (last edit: 7/18/2013 2:12:13 PM)
show user profile  Sir_Manfred
Doesn't mirrors or chrome have almost 100% reflection? Maybe not 100% but surely more than 90%?



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read 833 times
7/18/2013 2:14:31 PM (last edit: 7/18/2013 2:14:31 PM)
show user profile  Nanne
Yeah, chrome and mirrors might require more then 90%, you're right.

Kristoffer Helander
www.kristofferhelander.se
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read 831 times
7/18/2013 2:18:35 PM (last edit: 7/18/2013 2:18:35 PM)
show user profile  LionDebt
EVERYTHING HAS FRESNEL!

*holds a gun to your head*





edit: Can't find supporting video evidence of the above statement. Hopefully Error gets a chuckle.
read 825 times
7/18/2013 2:24:40 PM (last edit: 7/18/2013 2:31:36 PM)
show user profile  Nanne
Well, a gun to my head is good enough evidence for me - I believe you! :P

Kristoffer Helander
www.kristofferhelander.se
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read 818 times
7/18/2013 2:46:05 PM (last edit: 7/18/2013 2:46:05 PM)
show user profile  LionDebt
Found it :)


read 810 times
7/18/2013 3:03:23 PM (last edit: 7/18/2013 3:03:23 PM)
show user profile  Sir_Manfred
Hehehe.. hadn't seen that video before.
And didn't realize Error was in it until I saw the plates on the car! :D
Awesome.



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read 807 times
7/18/2013 3:13:29 PM (last edit: 7/18/2013 3:13:29 PM)
show user profile  Nanne
Haha! :D

Kristoffer Helander
www.kristofferhelander.se
  :: Works ::   |  :: Resumé ::   |  :: Contact ::   |  :: CG Blog ::   |  :: Links ::     
read 787 times
7/18/2013 5:40:35 PM (last edit: 7/18/2013 5:40:35 PM)
show user profile  coolamigo
Regarding the main question
If possible, can someone please show the diff. by example(s)
read 662 times
7/29/2013 8:05:07 AM (last edit: 7/29/2013 8:05:07 AM)
show user profile  donvella
fresnel / falloff - same thing

falloff gives you control via color (black/white) instead of an IOR (value 0, 1)





read 654 times
7/29/2013 9:19:46 AM (last edit: 7/29/2013 9:20:32 AM)
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