so, any free time in your hands?  want to put that quad core to stress with
povray 3.7beta?  If you're, try the little scene below.  With +AM2 +A0.04 +J1.0
1024X768 on a P4 2.66, it just brought my PC to a crawl for the whole weekend!
It all began with a challenge in a brazilian forum, when some guy claimed this
scene:
http://200.213.105.41/greysilica/exemplos/cjcopojateado.png

took him 48 hours to render with Blender internal renderer.

Surely something was wrong, or so I thought.  Well, in the region between the
bottom of second row cups and the top of first row cups, render time was about
11 minutes a line!  It is all about refractions, normals and fresnel
reflections.  40 hours total on a P4 2.66 with povray 3.6.1...

I'm sure it's possible to optimize it with some no_image, no_shadow trickery
with doubles and no_reflection in the main cups, but I didn't thought of it
beforehand!


global_settings { max_trace_level 40 }

background { rgb 1 }

#local cup =
lathe { bezier_spline
48, //nr points
/* 0*/ <0, 2.8571826>, <174.28571, 2.8571826>, <197.14286,2.8571826>,
<197.14286,2.8571826>,
/* 1*/ <197.14286, 2.8571826>, <197.14286, 2.8571826>, <211.42857,-2.8571174>,
<228.57143,14.285683>,
/* 2*/ <228.57143, 14.285683>, <245.71429, 31.428583>, <242.85714,85.714283>,
<242.85714,85.714283>,
/* 3*/ <242.85714, 85.714283>, <242.85714, 85.714283>, <265.71429,80.000003>,
<291.42857,105.71428>,
/* 4*/ <291.42857, 105.71428>, <317.14286, 131.42857>, <308.57143,108.57143>,
<308.57143,185.71428>,
/* 5*/ <308.57143, 185.71428>, <308.57143, 262.85714>, <308.57143,742.85714>,
<308.57143,742.85714>,
/* 6*/ <308.57143, 742.85714>, <308.57143, 742.85714>, <317.14286,737.14285>,
<308.57143,754.28571>,
/* 7*/ <308.57143, 754.28571>, <300, 771.42857>, <288.57143,780>,
<280,768.57143>,
/* 8*/ <280, 768.57143>, <271.42857, 757.14285>, <294.28571,165.71428>,
<277.14286,148.57143>,
/* 9*/ <277.14286, 148.57143>, <260, 131.42857>, <231.42857,131.42857>,
<217.14286,105.71428>,
/* 10*/ <217.14286, 105.71428>, <202.85714, 80.000003>, <205.71429,54.285713>,
<185.71429,45.714283>,
/* 11*/ <185.71429, 45.714283>, <165.71429, 37.142883>, <2.8571429,2.8571826>,
<0,2.8571826>

sturm
scale y*.8
scale 1/1000
interior { ior 1.5 }
hollow
}

#macro tex( col )
pigment { rgb col }
normal { bumps .1 scale .002 }
finish { ambient .01 diffuse .4 brilliance 1.2
specular .97 roughness .02
metallic .1
reflection { .2,.9 metallic .1 fresnel on exponent 1 }
conserve_energy
}
#end

union {
plane { y 0 pigment { rgb 1 } finish { ambient .2 diffuse .6 } }
object { cup translate 0 tex( <.7,.8,1,.8,.1> ) }
object { cup translate z*.7 tex( <.9,.86,.4,.8,.1> ) }
object { cup translate z*(.7+1.3) tex( <1,.96,.84,.8,.1> ) }
object { cup translate x*.7 tex(<1,1,1,.8,.1> ) }
object { cup translate x*.7+z*.7 tex(<.96,1,.67,.8,.1> )}
object { cup translate x*.7+z*.7*2 tex(<.7,1,.7,.8,.1> ) }
object { cup translate -x*.7 tex(<1,.6,.6,.1,.8> ) }
object { cup translate -x*.7+z*(.0+1.3) tex(<.5,.5,.8,.1,.8> ) }
object { cup translate -x*.7*2+z*(-.7+1.3) tex(<.7,1,.94,.1,.8> ) }
light_source { 1.6*(4-z*8) 1.2 }

rotate -x*30
translate z*2.6-y/3+x*.1
}

light_source { -z*8 .7 shadowless }

camera { angle 55
//aperture .04 blur_samples 60 confidence 1 focal_point y/3+z*2
}

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