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I was modeling a floor with varying levels of glossiness, and just as a
sanity check, I compared a floor of Fresnel reflection 0 to a floor with
no Fresnel reflection. To my surprise, the former was darker than the
latter. Is this correct? It seems to me that they should look the same.
The first attached image has only diffuse reflection. The second has
finish level Fresnel with reflection { 0 }. The last, for sake of
completeness, has full gloss with finish level Fresnel and reflection {
1 }. These images were rendered with radiosity, but rendering with
ambient yields similar results.
(I haven't seen clipka lately. Wasn't he working on this?)
------------[BEGIN CODE]------------
// +KFF3
#version 3.8;
#ifndef (Rad) #declare Rad = off; #end
#include "screen.inc"
global_settings
{ assumed_gamma 1
#if (Rad)
#declare Pixel = 1 / max (image_width, image_height);
radiosity
{ count 200
error_bound 0.5
pretrace_start 32 * Pixel
pretrace_end 2 * Pixel
recursion_limit 2
}
#end
}
#default { finish { ambient 0.1 diffuse 1.0 emission 0 } }
Set_Camera (<0, 2, -5>, <0, 1, 0>, 30 * image_width / image_height)
//--------------------- ENVIRONMENT ------------------------
#declare RBULB = 0.1;
#declare DIST = 5;
#declare Surface = pow (DIST / RBULB, 2);
light_source
{ <0, 2.5, 5>, rgb (1 + Surface) / 2
fade_power 2 fade_distance RBULB
spotlight point_at <0, 1, 0> radius 45 falloff 90
looks_like
{ sphere
{ 0, RBULB
pigment { rgb 1 }
finish { ambient 0 diffuse 0 emission Surface }
no_radiosity
}
}
}
box
{ -1, 1 scale <6, 8, 6>
hollow
pigment { rgb 0.6 }
}
//----- things to reflect -------
#declare Sculpture = union
{ cylinder { 0, 1.5 * y, 0.5 }
sphere { 1.5 * y, 0.5 }
}
object { Sculpture pigment { blue 0.5 } translate <0.6, 0, 5.5> }
object { Sculpture pigment { green 0.5 } translate <1.8, 0, 5.5> }
object { Sculpture pigment { red 0.5 } translate <3.0, 0, 5.5> }
//---------------------- GLOSS TEST ------------------------
plane
{ y, 0
pigment { checker rgb 0.03 rgb 0.6 }
#switch (frame_number)
#case (2)
#declare s_Case = "fresnel reflection { 0 }"
finish
{ fresnel
reflection { 0 }
conserve_energy
}
interior { ior 1.5 }
#break
#case (3)
#declare s_Case = "fresnel reflection { 1 }"
finish
{ fresnel
reflection { 1 }
conserve_energy
}
interior { ior 1.5 }
#break
#else
#declare s_Case = "no specular reflection"
#end
}
//---------------------- ANNOTATION ------------------------
Screen_Object
( union
{ text { ttf "cyrvetic" s_Case 0.001, 0 translate y }
text
{ ttf "cyrvetic"
concat ("Radiosity is ", #if (Rad) "on." #else "off." #end)
0.001, 0
}
pigment { rgb 0.7 }
finish { ambient 0 diffuse 0 emission 1 }
scale 0.065
},
<0, 0.8>, <0.02, 0.02>, yes, 1
)
-------------[END CODE]-------------
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Attachments:
Download 'glossy_floor-pbi-rad1.jpg' (16 KB)
Download 'glossy_floor-pbi-rad2.jpg' (15 KB)
Download 'glossy_floor-pbi-rad3.jpg' (16 KB)
Preview of image 'glossy_floor-pbi-rad1.jpg'
Preview of image 'glossy_floor-pbi-rad2.jpg'
Preview of image 'glossy_floor-pbi-rad3.jpg'
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