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Subject: 3.4.7.5.5.7 Mapping using warps. Typo in spherical warp example.
Date: 28 May 2015 17:18:57
Message: <55678641$1@news.povray.org>



 
 


I got lost while doing a spherical warp today and in turning to the
documentation for help, I picked up a typo. The spherical example reads:
sphere {
0,1
pigment {
hexagon
scale <0.5/pi,0.25/pi,1>*0.1
warp {
spherical
orientation y
dist_exp 1
}
}
}
It produces the spherical warp image seen. However, I believe there is a
typo where trying to scale in y. A scale in y has no effect on the
hexagon x,z pattern. To get the normally expected mapping ratios in a
way similar to the cylindrical example, the scale should be changed to:
scale <0.5/pi,1,1/pi>*0.1
though what I expect was the original intent of:
scale <0.5/pi,1,0.25/pi>*0.1
gives a valid result.
Thanks for your attention.
Bill P.
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From: James Holsenback
Subject: Re: 3.4.7.5.5.7 Mapping using warps. Typo in spherical warp example.
Date: 9 Jul 2015 14:06:30
Message: <559eb826$1@news.povray.org>



 
 


On 05/28/2015 05:19 PM, William F Pokorny wrote:
> I got lost while doing a spherical warp today and in turning to the
> documentation for help, I picked up a typo. The spherical example reads:
>
> sphere {
> 0,1
> pigment {
> hexagon
> scale <0.5/pi,0.25/pi,1>*0.1
> warp {
> spherical
> orientation y
> dist_exp 1
> }
> }
> }
>
> It produces the spherical warp image seen. However, I believe there is a
> typo where trying to scale in y. A scale in y has no effect on the
> hexagon x,z pattern. To get the normally expected mapping ratios in a
> way similar to the cylindrical example, the scale should be changed to:
>
> scale <0.5/pi,1,1/pi>*0.1
>
> though what I expect was the original intent of:
>
> scale <0.5/pi,1,0.25/pi>*0.1
>
> gives a valid result.
>
> Thanks for your attention.
> Bill P.
done ... sorry for delay (long story)
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