fresnel reflections, when to use them

[davision]

Right --- the part that really confuses me though is... I asked Vlado whether vray reproduced that parallel-view "compression" in ordinary glossy materials (i.e., not ones made glossy by adding a bump map). He said 'no' even though I thought it was almost an automatic byproduct.

Therefore, if vray doesn't account for that, I suppose it means we should be adding fresnel maps to our glossiness map slot too? I guess?

[RErender]

Therefore, if vray doesn't account for that, I suppose it means we should be adding fresnel maps to our glossiness map slot too? I guess?

I was playing with just this after reading Thorsten's post, works great after adjusting the curve a bit in the fresnel falloff map. Great for rough paint or plastics too. Just uncheck "overide material ior" and it adjusts along with the reflection ior.

[pailhead]

Mind posting an image as an example? I'm a bit lost.

[davision]

. Great for rough paint or plastics too. Just uncheck "overide material ior" and it adjusts along with the reflection ior.

But why just these materials? -- rough paint or plastics -- Shouldn't this fresnel function apply to anything with a degree of glossiness? Isn't that what makes something 'glossy' -- an inherent roughness in the surface. Whether it's slightly rough or very rough -- it seems the 'parallel compression effect' would still occur to some extent.

[RErender]

I did not mean just those, as I look around the room here I see the reflections behaving like this all around, even my waxy drink cup...

Pailhead, I'll see if I can get the time to show something.

[glyph]

have been looking again at the doorknob in the reflectivity lab..
- still not sure about the glossiness changing, it is a smooth highly shiny surface, but one thing that adds to the illusion is that, head on, all I can see is my face - which is stretched out - but at the sides of the knob I can see the room walls, a window, another door, very like a fisheye lens, and
these are compressed into a small area and as a result appear pin sharp

as I said I mostly do without fresnel for chrome /stainless - full reflection gives a more 'bling' look which suits the design style on those projects