Hi,

I have a strange problem, where I were not able to find a solution on the net so
far.

When I use a "sin(...)" in a sor- or lathe-object, the argument of the function
cannot exceed Pi.

For Example:

sor{5,
     <1,2>,
     <sin(3),3>,
     <sin((1.001-0.001)*Pi),5>,
     <4,6>,
     <1,7>
     pigment{color Blue}
}

this works fine, but with

sor{5,
     <1,2>,
     <sin(3),3>,
     <sin(1.001*Pi),5>,
     <4,6>,
     <1,7>
     pigment{color Blue}
}

I get the error message:
"Parse error: Incorrect point in sor."

I used a self-defined Pi in this example, but even without "sin(3)" works,
"sin(3.15)" and bigger arguments do not work.
Even if I have a macro which calculates the sine

#macro Sine(x)
#declare Global_Value=sin(x);
#end

and put "Global_Value" within the brackets of the coordinates in sor (or lathe)
I have the exact same effect.
If I use a sine for the position of a light source for example, I can put in
every argument.


I am using Povray 3.6.1 from the ubuntu repository and I also tried it with the
same result on a windows machine and Povray 3.6.2.


Any suggestions?


Cheers
McMinty

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McMinty schrieb:
> Hi,
>
> I have a strange problem, where I were not able to find a solution on the net so
> far.
>
> When I use a "sin(...)" in a sor- or lathe-object, the argument of the function
> cannot exceed Pi.
>   

This is not a problem with the sin function per se, but with its 
function result becoming negative, which sor and lathe will refuse to 
accept in the X coordinate. For instance, the following should work 
perfectly:

sor{5,
    <1,2>,
    <1+sin(3),3>,
    <1+sin(1.001*Pi),5>,
    <4,6>,
    <1,7>
    pigment{color Blue}
}

Post a reply to this message

"clipka" <ano### [at] anonymousorg> wrote in message 
news:4a79f78a$1@news.povray.org...
> McMinty schrieb:
>> Hi,
>>
>> When I use a "sin(...)" in a sor- or lathe-object, the argument of the 
>> function
>> cannot exceed Pi.
>>
>
> This is not a problem with the sin function per se, but with its function 
> result becoming negative, which sor and lathe will refuse to accept in the 
> X coordinate. For instance, the following should work perfectly:
>
> sor{5,
>    <1,2>,
>    <1+sin(3),3>,
>    <1+sin(1.001*Pi),5>,
>    <4,6>,
>    <1,7>
>    pigment{color Blue}
> }

You can also use  abs(sin(,,,))  if you want the points to effectively 
'straddle' the y-axis as an alternative to thickening out the core of the 
generated object.

Regards,
Chris B.

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Thanks,

this shows again that I should read the docs more carefully.


Cheers
McMinty

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