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I have a height field I'm using as a mountain from the outside, and a cave
from the inside.
What I want to do is punch a hole in the heightfield so I can stand inside
and look out, or vice-versa.
I tried
#declare mountain = difference
{
object <the height field>
object <a box that spans the skin of the height field>
}
but I don't seem to be able to see beyond the skin of the box, which I can
see projecting into the cave.
What am I doing wrong??
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"gil" <nomail@nomail> wrote:
> I have a height field I'm using as a mountain from the outside, and a cave
> from the inside.
>
> What I want to do is punch a hole in the heightfield so I can stand inside
> and look out, or vice-versa.
>
> I tried
> #declare mountain = difference
> {
> object <the height field>
> object <a box that spans the skin of the height field>
> }
>
> but I don't seem to be able to see beyond the skin of the box, which I can
> see projecting into the cave.
>
> What am I doing wrong??
Well.... I answered it myself. I made the box pigment {rgbt<1,0,0,1>}. I
now have a tunnel through from inside to outside.
But, in a totally different example, if I'd taken a box, and drilled through
it with a cylinder ie difference{box{} cylinder{}}, I wouldn't have had to
make the cylinder transparent.
Why?
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Wasn't it gil who wrote:
>"gil" <nomail@nomail> wrote:
>> I have a height field I'm using as a mountain from the outside, and a cave
>> from the inside.
>>
>> What I want to do is punch a hole in the heightfield so I can stand inside
>> and look out, or vice-versa.
>>
>> I tried
>> #declare mountain = difference
>> {
>> object <the height field>
>> object <a box that spans the skin of the height field>
>> }
>>
>> but I don't seem to be able to see beyond the skin of the box, which I can
>> see projecting into the cave.
>>
>> What am I doing wrong??
>
>Well.... I answered it myself. I made the box pigment {rgbt<1,0,0,1>}. I
>now have a tunnel through from inside to outside.
>
>But, in a totally different example, if I'd taken a box, and drilled through
>it with a cylinder ie difference{box{} cylinder{}}, I wouldn't have had to
>make the cylinder transparent.
>
>
>Why?
As far as I can see difference{box{} cylinder{}} works exactly the same
way as difference{height_field{} box{}}.
If I understand what you're trying to achieve, you should be doing is
height_field{clipped_by{box{}}}.
--
Mike Williams
Gentleman of Leisure
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Sorry, I meant to say
height_field {clipped_by {box {} inverse}}}
--
Mike Williams
Gentleman of Leisure
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Mike Williams <nos### [at] econym demoncouk> wrote:
> Sorry, I meant to say
>
> height_field {clipped_by {box {} inverse}}}
>
>
> --
> Mike Williams
> Gentleman of Leisure
Aaahh... Thanks. I'll have a look at clipped_by.
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