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I want to create multiple images that differ only by one or two variables,
such as the width of one object and the value of a text string.
I was trying to find a way to do this by passing parameters to povray from a
batch file, but couldn't find a way to do it.
The animation feature allows external control of the Clock value, but it's
not suited for the purpose I need.
I thought of using an internal #while loop, but didn't see any way to output
an image file from inside the loop.
Right now the only way I can think of to do it is to write a tool that
creates multiple similar .pov files, one for each image I want to make, and
then run a batch file to invoke povray on all the created files. Seems
clumsy though.
Any suggestions will be greatly appreciated. I'm running POV-Ray 3.6 on
Debian Linux 3.1.
-Ted
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> I was trying to find a way to do this by passing parameters to povray from
a
> batch file, but couldn't find a way to do it.
3.1.2.5.1 Constant
"Declare=IDENTIFIER=FLOAT Declares an identifier with a float value
You can now declare a constant in an INI file, and that constant will be
available to the scene. Since INI file statements may also be laced on the
command-line, you can therefore also declare on the command-line (though
there is no switch for it)."
See the docs for an example.
- Slime
[ http://www.slimeland.com/ ]
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ttread wrote:
> I want to create multiple images that differ only by one or two variables,
> such as the width of one object and the value of a text string.
>
> I was trying to find a way to do this by passing parameters to povray from a
> batch file, but couldn't find a way to do it.
povray [options] Declare=identifier=value
> The animation feature allows external control of the Clock value, but it's
> not suited for the purpose I need.
Huh? There are lost of sample scenes coming with POV-Ray that do
exactly this. For example
incdemo/i_internal.pov
incdemo/glasses/samp_demo.pov
incdemo/glasses/glass.pov
textures/patterns/crackle_form.pov
portfolio/*
Christoph
--
POV-Ray tutorials, include files, Landscape of the week:
http://www.tu-bs.de/~y0013390/ (Last updated 24 Jul. 2005)
MegaPOV with mechanics simulation: http://megapov.inetart.net/
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Thank you very much, that's exactly what I was looking for.
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Christoph Hormann <chr### [at] gmx de> wrote:
> ttread wrote:
> > I want to create multiple images that differ only by one or two variables,
> > such as the width of one object and the value of a text string.
> >
> > I was trying to find a way to do this by passing parameters to povray from a
> > batch file, but couldn't find a way to do it.
>
> povray [options] Declare=identifier=value
Yep, thanks, that's what I was looking for.
>
> > The animation feature allows external control of the Clock value, but it's
> > not suited for the purpose I need.
>
> Huh? There are lost of sample scenes coming with POV-Ray that do
> exactly this. For example
>
> incdemo/i_internal.pov
> incdemo/glasses/samp_demo.pov
> incdemo/glasses/glass.pov
> textures/patterns/crackle_form.pov
> portfolio/*
>
You are correct; however, I thought there must be a better way.
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Ok, I have tried passing a string value through the command line using the
syntax:
Declare=TEXT_VAR="Foo"
This does not work because the value gets converted to a float type.
Apparently it's not possible to pass a string on the command line.
I guess I will use the animation clock value and test it against a case
statement to select different strings.
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Wasn't it ttread who wrote:
>
>I guess I will use the animation clock value and test it against a case
>statement to select different strings.
It would be easier to use frame_number to index an array of strings.
#declare Params = array[3] {"Foo","Bar","Baz"}
#declare MyParam = Params[frame_number-1];
Remember that frame_number starts at 1, but arrays number from 0.
--
Mike Williams
Gentleman of Leisure
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Wasn't it ttread who wrote:
>I guess I will use the animation clock value and test it against a case
>statement to select different strings.
If you've got several parameters to set for each frame, you might
consider storing them in a data file, and reading them like this:
#fopen DATA "data.txt" read
#declare i=0;
#while (i < frame_number)
#read (DATA, Text_var, Float_var, Vector_var)
#declare i=i+1;
#end
The data.txt file would be formatted like this:
"Foo", 1.3, <1.0,2.0,3.0>,
"Bar", 2.2, <1.1,2.1,3.1>,
"Baz", 3.1, <1.2,2.2,3.2>,
(Don't forget the commas on the ends of the lines)
--
Mike Williams
Gentleman of Leisure
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Mike Williams <nos### [at] econymdemoncouk> wrote:
> It would be easier to use frame_number to index an array of strings.
Yes, thanks, I should have said frame_number
-Ted
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