One little problem we have is that the Reflect node doesn't deal with lights. It only reacts to props and figures. We need to use a node that generates specular reflections of our directional light sources.

For 99% of materials, the best node to use is Blinn. It is very versatile. And it has the Fresnel effect built in, although not expressed in a way that is as easy to deal with as IOR.

Let's start simple. I'm going to add a Blinn node.

specular = Blinn(WHITE, .02, .5, 2)

And I want it on the left side of the shader tree so I can mess with it in the material room. The PM function will move it over there as if this node was a parameter.

specular = PM(specular)

Now I need to do one other thing. When the specular effect is strong, the diffuse effect should be weak. There is no perfect way to do this in Poser, but I have a hack that works pretty well. I treat the output of the specular node as if it was a number and use that to calculate the complementary amount of diffuse reflection.

diffuseValue = Sub(1, Clamp(specular))

Putting this all together, the script is:

specular = Blinn(WHITE, .02, .5, 2)
specular = PM(specular)
color = PMC(Color(.3, 0, 0), "Color")
diffuseColor = AGC(color)
diffuseValue = PM(.8, "Diffuse Value")
diffuseValue = diffuseValue * Sub(1, Clamp(specular))
diffuse = Diffuse(diffuseColor, diffuseValue)

ior = PM(1.5, "IOR")
fresnel = TrueFresnel(ior)
reflect = AGC(Reflect())

combination = Blend(diffuse, reflect, fresnel) + specular
output = GC(combination)
surface = View(output)

The attached image shows the results. Very convincing.

Experiment with different values of Eccentricity, SpecularRollOff, and Reflectivity.

Eccentricity is basically how big the highlight is. Lower values produce a smaller highlight.

The SpecularRollOff is the Blinn node's equivalent to IOR. Lower values will decrease the perpendicular reflection value.

And Reflectivity is the maximum reflectivity or shininess of the surface.

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