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I would like to try the new heightfield macros using an image as the
function, but have not been able to get the syntax right. Would someone mind
posting an example?
-Shay
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In article <3d496f6f$1@news.povray.org>, "Shay" <sah### [at] simcoparts com>
wrote:
> I would like to try the new heightfield macros using an image as the
> function, but have not been able to get the syntax right. Would someone mind
> posting an example?
function {pigment {image_map {...}}}
--
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/
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Christopher James Huff <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
>
> function {pigment {image_map {...}}}
>
This is what I have been trying. I am getting an error, however.
--Parse Error: Expected 'string', colour identifier found instead--
I guess I am doing something else wrong. Here is the relevant part of the
scene:
#declare ImageFunction = function {pigment {image_map {png "name2.png" }}};
#include "Shapes.inc"
HF_Square (ImageFunction,no,no,<10,10>,no,"Test_Out.inc",<-1,-1,-1>,<1,1,1>)
-Shay
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In article <3d498742@news.povray.org>, "Shay" <sah### [at] simcopartscom>
wrote:
> I guess I am doing something else wrong. Here is the relevant part of the
> scene:
> #declare ImageFunction = function {pigment {image_map {png "name2.png" }}};
> #include "Shapes.inc"
>
> HF_Square (ImageFunction,no,no,<10,10>,no,"Test_Out.inc",<-1,-1,-1>,<1,1,1>)
It expects a scalar float value instead of the color the pigment image
gives. Try "function {ImageFunction(x, y, z).gray}"
I thought there was another keyword that used the same algorithm the
height field object uses to get a float value from a color, but I guess
it didn't make it into the final release. The ".gray" method should be
close enough for most purposes though.
--
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/
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From: Marc-Hendrik Bremer
Subject: Re: using image as a function hf_macro
Date: 2 Aug 2002 03:04:46
Message: <3d4a2f0e@news.povray.org>
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"Christopher James Huff" <chr### [at] maccom> schrieb im Newsbeitrag
news:chr### [at] netplexaussieorg...
> I thought there was another keyword that used the same algorithm the
> height field object uses to get a float value from a color, but I guess
> it didn't make it into the final release. The ".gray" method should be
> close enough for most purposes though.
The other one was .hf, which is still useable, but marked as "experimental
feature".
Marc-Hendrik
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Christopher James Huff <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
>
> It expects a scalar float value instead of the color the pigment image
> gives. Try "function {ImageFunction(x, y, z).gray}"
>
This solved the problem. Thank you for your help.
-Shay
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