PBR value lists?

Olli.

does anyone have extensive lists of albedo/spec

ive got this IOR list which is extremely handy, and it would be nice to have a similar resource for albedo and specular (especially metals)

passerby

i tend to use this as a reference a lot


small list but you can use base values and make assumptions from it

stevston89

This is the best one out there:

http://seblagarde.wordpress.com/2012/04/30/dontnod-specular-and-glossiness-chart/

Cryengine also released on that is very good:

http://docs.cryengine.com/display/SDKDOC4/Physically+Based+Rendering

Olli.

just found these:

ALBEDO:

New asphalt, 0.04 - 0.05
Black acrylic paint, 0.05
Aged asphalt, 0.1 - 0.12
Conifer Forest, 0.08 - 0.15
Bare soil, 0.17
Deciduous trees, 0.15 - 0.18
"White" asphalt shingle, 0.2
Green grass, 0.25
Aged concrete, 0.2 - 0.3
Desert sand, 0.4
New concrete (traditional), 0.4 - 0.55
Ocean ice, 0.5 - 0.7
New concrete with white portland cement, 0.7 - 0.8
White acrylic paint, 0.8
Fresh snow, 0.8 - 0.9
Water, 0.03 - 1.0

Old/melting snow  0.40 - 0.80
Tundra 0.2

Soil (Dark/Wet) 0.05 
Soil (Light/Grey) 0.4
Sand 0.15 - 0.45
Ice (Sea) 0.3 - 0.45
Ice (Glacier) 0.2 - 0.4

white asphalt shingle - 0.2
galvanized steel - 0.24
terra cota tile - 0.28
tar & gravel - 0.33

magnesium oxide - 0.96 [D]
alabaster - 0.92 [D]
polished silver - 0.88-0.93 (S)
white gypsum - 0.85 [D]
fresh snow - 0.75-0.78 [M]
mirror - 0.72-0.85 (S)
matte silver - 0.7 [D-S]
polished aluminum - 0.65-0.75 (S)
polished chrome - 0.6-0.7 (S)
matte aluminum - 0.55-0.6 [D-S]
white paper sheet - 0.6-0.7 [D-S]
melting snow (clean) - 0.6-0.62 [M]
matte chrome - 0.5 [D-S]
plaster - 0.4-0.45 [D]
natural silk fabric - 0.35-0.55 [M]
batten (fresh wood) - 0.35-0.42 [D-S]
face skin - 0.25-0.35 [M]
white dry sand - 0.24-0.32 [D]
yellow clay - 0.16 [D]
batten (old, weathered) 0.12-0.16 [D-S]
white wet sand - 0,11-0.2 [D]
dry asphalt - 0.1-0.18 [M]
black soil (dry) - 0.07-0.08 [D]
wet asphalt - 0.06-0.08 [D-S]
summer foliage - 0.09-0.12 [D-S]
conifer - 0.08-0.12 [D & D-S]
autumn foliage - 0.15-0.3 [D-S]
black soil (wet) - 0.02-0.05 [D-S]
black velvet - 0.01-0.03 [D]

D - diffuse
S - specular
M - mixed

https://corona-renderer.com/forum/index.php?topic=2359.0

stevston89

@ Olli - Note those are linear values that don't have color. You would have to convert the linear values to srgb to use them and then you would have to ad color to that value. Also that is just for albedo which is less of an issue than having proper reflectivity/spec.

Also I wouldn't trust anything that doesn't come from an extremely credible source. Like Epic/Unreal, Cryengine, Marmoset, Quixel, etc.

s6

Exactly what I was about to say, Stevston. I was going to ask if we (or the guy on the corana forum) knows where they came from to confirm the accuracy of the values.

Thanks for the links BTW. Great info.

radiancef0rge

stevston89 wrote: »

@ Also I wouldn't trust anything that doesn't come from an extremely credible source. Like Epic/Unreal, Cryengine, Marmoset, Quixel, etc.

what makes a source extremely credible? is it some process they use?

marks

The albedo values in that list are pretty accurate afaik.

s6

radiancef0rge wrote: »

what makes a source extremely credible? is it some process they use?

Capturing physically accurate materials is a complicated and costly process from what I've been told

So when a random guy on a forum(the carona forum, not referring to Olli) provides a list like the one above, it's either from a reputable source (like Steveston listed) or came out of thin air.

Like Marks said though, they seem close enough, even if they are off.

deolol

This is kind of a noob question but how do we convert these values in photoshop? :P

Froyok

With a bit of Pow() of course ! :poly142:

beefaroni

Wow a lot of great resources.

In addition, when Megascans and Substance Designer ships with PBR Gametextures materials it should be easy to get the values.