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Hi all,
whilst changing an old scene to work under 3.7 I found a funny.
Have narrowed it down to the following.
using following code all is well and as expected, however if you change
the position of the plane to +2 you lose the sphere ???
Am puzzled as to why.
Can use workaround of making image_map with negative plane and then
rotate it 180*y
Is probably my understanding of things
... Bob
plane {
z, -2
texture {
pigment {
image_map {
png "test.png"
interpolate 2 // smooth it
once // don't tile image, just one copy
}
// transform it to unit-size (-1 to +1)
translate -0.5*(x+y) // center on the origin
scale 2 // make it unit-sized
}
finish { ambient 0.3 }
}
}
sphere { 0,1 pigment { rgbt 1 } hollow //
transparent sphere containing media
interior { media { emission 20
density { spherical density_map {
[ 0 color rgbt <1, 0, 0, 1> ]
[ 1 color rgbt <.9, 1, 0, -1> ] }
} } } }
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Attachments:
Download 'p1_nbg.png' (5 KB)
Download 'p1_ok.png' (6 KB)
Preview of image 'p1_nbg.png'
Preview of image 'p1_ok.png'
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El 13/05/16 a las 20:22, Bob Frew escribió:
> Hi all, whilst changing an old scene to work under 3.7 I found a
> funny. Have narrowed it down to the following.
>
> using following code all is well and as expected, however if you
> change the position of the plane to +2 you lose the sphere ??? Am
> puzzled as to why.
Because planes do have an interior too. You must make it hollow when
the media is inside (below) the plane.
--
jaime
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On 13/05/2016 21:59, Jaime Vives Piqueres wrote:
> El 13/05/16 a las 20:22, Bob Frew escribió:
>> Hi all, whilst changing an old scene to work under 3.7 I found a
>> funny. Have narrowed it down to the following.
>>
>> using following code all is well and as expected, however if you
>> change the position of the plane to +2 you lose the sphere ??? Am
>> puzzled as to why.
>
> Because planes do have an interior too. You must make it hollow when
> the media is inside (below) the plane.
>
> --
> jaime
Hi Jaime,
many thanks for that.
I had always thought of a plane as like a piece of thin paper and the
"inside/outside" as more of a consistency thing with other objects.
... cheers Bob
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Le 16-05-13 14:22, Bob Frew a écrit :
> Hi all,
> whilst changing an old scene to work under 3.7 I found a funny.
> Have narrowed it down to the following.
>
> using following code all is well and as expected, however if you change
> the position of the plane to +2 you lose the sphere ???
> Am puzzled as to why.
> Can use workaround of making image_map with negative plane and then
> rotate it 180*y
>
> Is probably my understanding of things
> ... Bob
>
The plane have an interior. You must make it hollow or use the inverse
option.
By the way, a disk object share the same interior as a coincident plane,
and can affect nedias in the same way, outside of it's visible part.
Alain
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Bob Frew <bob### [at] ntlworld com> wrote:
> I had always thought of a plane as like a piece of thin paper and the
> "inside/outside" as more of a consistency thing with other objects.
A plane is a shape of infinite volume. One side is the inside, and
the other side is the outside.
If you eg. make a cube as an intersection of six planes (with their
normal vectors all pointing out of the cube), it will be a solid
shape, just like a box (in the sense that povray considers "solid";
ie. it can be used in CSG, and it won't contain media/fog by default).
--
- Warp
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