Hi,

Am getting a weird result with this (can anybody with beta2 confirm?):
    isosurface {
        function {(x+y)^3}
        contained_by {sphere {0, 2}}
        pigment {color rgb <.5, .35, .15>}
}
Atleast I *think* I am (since I'm learning isosurfaces using the docs)
and megapov seems to confirm it. I'm using povray3.5 beta1 on a win98
machine.
Sorry to bring a beta1 problem here but, with my downloading speed
(and with other items in the que), by the time I finish downloading
beta2 , it will be time for beta3:(
Incidentally, a big Thank You to whoever wrote the docs on isosurfaces
(especially): I now see the light (and isosurfaces - even if I need
Megapov really appreciate them:))

Regards,
Anoop

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Wasn't it anoop who wrote:
>Hi,
>
>Am getting a weird result with this (can anybody with beta2 confirm?):
>    isosurface {
>        function {(x+y)^3}
>        contained_by {sphere {0, 2}}
>        pigment {color rgb <.5, .35, .15>}
>}
>Atleast I *think* I am (since I'm learning isosurfaces using the docs)
>and megapov seems to confirm it. I'm using povray3.5 beta1 on a win98
>machine.

This particular function needs a largish max_gradient. Try adding
"max_gradient 10". Also, adding "open" to the end of your contained by
may[1] help you see the actual surface, rather than the edge of your
contained_by object.

Here's a complete scene that shows the surface behaving correctly in
3.5b2

camera { location  <1, 0, -4> look_at 0}

sky_sphere { pigment {rgb z}}

light_source {<100,100,-200> colour rgb 2}

isosurface {
  function {(x+y)^3}
  max_gradient 10
  contained_by {sphere {0, 2}}  open
  pigment {color rgb <.5, .35, .15>}
}

My Isosurface Tutorial has now been updated to include 3.5 syntax if
that helps <http://www.econym.demon.co.uk/isotut/index.htm>. In
particular the page of that tutorial relevant to this situation is
<http://www.econym.demon.co.uk/isotut/maxgradient.htm>


[1]Depending on which side of the plane you've positioned your camera.
-- 
Mike Williams
Gentleman of Leisure

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Mike Williams wrote in message ...
>Wasn't it anoop who wrote:
>>Hi,
>>
>>Am getting a weird result with this (can anybody with beta2
confirm?):
>>    isosurface {
>>        function {(x+y)^3}
>>        contained_by {sphere {0, 2}}
>>        pigment {color rgb <.5, .35, .15>}
>>}
>>Atleast I *think* I am (since I'm learning isosurfaces using the
docs)
>>and megapov seems to confirm it. I'm using povray3.5 beta1 on a
win98
>>machine.
>
>This particular function needs a largish max_gradient. Try adding
>"max_gradient 10". Also, adding "open" to the end of your contained
by
>may[1] help you see the actual surface, rather than the edge of your
>contained_by object.
>
>Here's a complete scene that shows the surface behaving correctly in
>3.5b2

Thanks. will try it out: the starting tutor in the docs had not
mentioned anything about max_gradient - though I remember reading
something about it elsewhere - perhaps in your tutorial (just glance
dthru it - wanted to practice it after this)

>My Isosurface Tutorial has now been updated to include 3.5 syntax if
>that helps <http://www.econym.demon.co.uk/isotut/index.htm>. In
>particular the page of that tutorial relevant to this situation is
><http://www.econym.demon.co.uk/isotut/maxgradient.htm>
>
>
>[1]Depending on which side of the plane you've positioned your
camera.


Have already d'led it: will go thru it properly.Thanks again

-Anoop

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