Hi all,

I am using the IsoCSG Library file (version 0.4) to create some rounded
shapes. I am using the blob_threshold technique to round off the inside
corner where 2 rounded boxes meet at right-angles. However this also
produces a bulge on the outside corner. How do I create a smooth transition
on the inside of corner and avoid the bulge on the outside?

My code is below and a reference image can be found at:
http://www.pearse.co.uk/pov/blobtest.png

Also........if I am using IC_Threshold with a value of 0.2 for rounding the
"outer" corners of a shape what is equivalent blob_threshold value for
rounding the "inner" corners of a shape? Please see:
http://www.pearse.co.uk/pov/CB18_rmp5.png
as an example of what I am trying to do.

Thanks

Reuben
doo### [at] breathemailnet
=====================================================
//Blobtest

#version 3.5;

global_settings {
  assumed_gamma 1.0
}

background { color <0.750,0.500,0.300> }

camera {
  location    <0, 0, -15>
  look_at     <0, 0, 1.7>
  angle      30
}


light_source {
  <-1000, 1000, -5000>
  color rgb 1.2
}

#include "colors.inc"
#include "iso_rcsg.inc"


#declare fn_outsidebox1 = IC_Threshold( IC_Translate( IC_Box
(<-1.2,-1.2,-0.05>, <1.2,1.2,0.05>), 1.2*z), 0.2)
#declare fn_outsidebox2 = IC_Rotate (fn_outsidebox1, 90*y)

//Declare Blob_threshold
#declare Blob_threshold=0.03;

//Blob the boxes together
#declare fn_CB18 = function {
(1+Blob_threshold) -Blob_threshold^fn_outsidebox2(x,y,z) -Blob_threshold^fn_
outsidebox1(x,y,z)  }

#declare fn_XX= function { fn_CB18(x, y, z) }

#declare CB18_TEMP =
                     isosurface {
                       function { fn_XX(x, y, z) }
                       max_gradient 5
                       accuracy 0.01
                       contained_by { box { -8+z*5, 8+2*z } }
                       pigment { rgb <0, 0.2, 1.1> }
                       scale 1.2
                     }

object {
        CB18_TEMP
        rotate <0, -20, 0>
        rotate <-50, 0, 0>
        }

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