I suspected letting it be defaults might be the problem so I gave this a try
and 3.7 beta doesn't show a message about isosurface 'max_gradient' but when
I checked using 3.6 I found it wanted the number to be 2.217 instead of a
default of 1.1 and putting that larger number in fixed the isosurface cone
for me.
I haven't followed what is supposed to happen about this particular warning
message. Yet to be added, or is missing by mistake (am doubting that).
Got to be careful that tested SDL is adequately correct, comparative with
earlier or non-beta POV as Warp said. It's easy to put something through
these betas and "expect" something without it really being okay in the first
place.  ;^)

----- Original Message ----- 
From: "Sven Geier" <.sven.at.sgeier.dot.net.nospamplease>
Newsgroups: povray.beta-test
Sent: Thursday, November 13, 2008 4:23 PM
Subject: Beta29 isosurface badly broken


> As a bit of a followup on the f_crackle posts from earlier, a bunch of
> tinkering
> finds that much of 'isosurface' appears pretty broken in 3.7b29.
>
> Could someone confirm or deny that the following produces something rather
> different from what one might assume simply by looking at the code.

// ---------------
camera {
 location <.1,2,-2>
 look_at   <0, -.4, 0> }
sky_sphere{pigment{color rgb <.2,.4,.6>}}
cone {
 1*y,  0.0, 0*y, .3
  pigment {color rgb 10}
}
isosurface { function { 2*sqrt(x*x+z*z)+y-1  }
 max_gradient 2.22 /* the fix? */
  pigment { hexagon scale .1  }
}
//--------

> (For reference: I would expect a bright cone completely enclosed/obscured
> by a
> larger hexagon-colored cone).



-- 
/*bob hughes*/

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