Quote -  Gotcha.  And you have a HDR sky map on the EnvSphere?   That puddle material looks mighty tasty.  How do you do that?

The sky map I used is LDR.

Here's how I made the puddle shader. Using matmatic, I made a pavement shader, a water shader, and I mixed them. LOL It's just a test - not finished.

antigamma = PM(1, "Gamma")
gamma = 1 / antigamma def View(x):
 return EmptySurface(Alternate_Diffuse = x)

def AGC(x):
 return x ** antigamma

def GC(x):
 return x ** gamma

def PuddleMask(s=8):
 m = Clamp(3 * FractalSum(s, s, s, 2, 0, .45, .999))
 return m

def PavementSurface():
 clr = PMC(.3, "Pavement Color")
 clr1 = AGC(clr)
 clr2 = AGC(clr  + .1)
 dc = Spots(clr1, clr2, .1, 0, .25, 0, 2)
 diffuse = Clay(dc, .8, .5)
 output = GC(diffuse)
 s = EmptySurface()
 s.Alternate_Diffuse = output
 s.Bump = .1 * FractalSum(.2, .2, .2, 8, 0, .5, .7)
 return s, diffuse

def WaterSurface(under = BLACK, ripple = 0):
 s = EmptySurface()
 fresnel = TrueFresnel(1.33)
 reflect = AGC(Reflect())
 output = Blend(under, reflect, fresnel)
 output = GC(output)
 if ripple:
  if isNode(ripple):
   s.Bump = ripple
  else:
   s.Bump = ripple * FractalSum(1, 1, 1, 2, 0, .5, .93)
 s.Alternate_Diffuse = output
 return s

 

pavement, pdif = PavementSurface()
water = WaterSurface(pdif, .1)
refract = AGC(Refract(0, 1))
under = EmptySurface(Alternate_Diffuse = GC(refract))
refpuddles = Mix(under, WaterSurface(refract, .1), PuddleMask())

 

outputs += [
 "Test", Mix(pavement, water, PuddleMask())
]

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)