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To visualize the effects of the two parameters of the superellipsoid I
rendered this gallery.
I hope you like it. :-)
Lars R.
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Attachments:
Download 'super1024_8.png' (227 KB)
Preview of image 'super1024_8.png'
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"Lars R."wrote:
> To visualize the effects of the two parameters of the superellipsoid I
> rendered this gallery.
Thanks! That's quite handy.
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On 16/01/2012 4:59 PM, Lars R. wrote:
> To visualize the effects of the two parameters of the superellipsoid I
> rendered this gallery.
>
> I hope you like it. :-)
>
Thanks, I can make use of that. :-D
--
Regards
Stephen
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Le 16/01/2012 17:59, Lars R. nous fit lire :
> To visualize the effects of the two parameters of the superellipsoid I
> rendered this gallery.
>
> I hope you like it. :-)
Nice.
Why is it such red ?
2 points:
* there is more past the 2.0 limit (looking at 3, 4 and 5 for instance,
probably not with 1/4 step). Maybe you can use some log/exp scale
instead of a linear one. (1.0 is a must have, 0.5 also, as well as 2.0,
other values might be something along k = 1+log/b (x) ; your choice of
base b.) Central point might remains around 1.0;
* might have some issues of self-shading or computation of intersection
with bounding box or similar for n=0 & e >= 1 (notice the bottom of the
objects on last line)
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>> I hope you like it. :-)
>
> Nice.
>
> Why is it such red ?
It looks not so bad on my office LCD. At home it looks more violet and
veries a lot when changing the viewing angle to the screen. Very bad.
You can give me a better rgb value or I try to render with Pov3.7 that
calculates colors differently (physically more correct?), and – even
more important – uses all 4 CPU cores in parallel! :-D
> 2 points:
> * there is more past the 2.0 limit (looking at 3, 4 and 5 for instance,
> probably not with 1/4 step). Maybe you can use some log/exp scale
> instead of a linear one. (1.0 is a must have, 0.5 also, as well as 2.0,
> other values might be something along k = 1+log/b (x) ; your choice of
> base b.) Central point might remains around 1.0;
I'll try tomorrow.
> * might have some issues of self-shading or computation of intersection
> with bounding box or similar for n=0 & e >= 1 (notice the bottom of the
> objects on last line)
All superellipsoids are completely inside of a bounding box of
<-1,-1,-1>,<+1,+1,+1>. So I didn't get what you want.
Lars R.
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Le 17/01/2012 00:23, Lars R. a écrit :
>> * might have some issues of self-shading or computation of intersection
>> with bounding box or similar for n=0 & e >= 1 (notice the bottom of the
>> objects on last line)
>
>
> All superellipsoids are completely inside of a bounding box of
> <-1,-1,-1>,<+1,+1,+1>. So I didn't get what you want.
IIRC, a value of 0 is not really recommended in the superellipsoid
documentation: it likes better something like 0.01
(so your range could be 0.01 , , 0.1, , 1, , 10, , 100
and intermediates values might be either (sqrt(10))^k (k from -4 to +4)
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Attachments:
Download 'super_shadow.png' (29 KB)
Preview of image 'super_shadow.png'
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> IIRC, a value of 0 is not really recommended in the superellipsoid
> documentation: it likes better something like 0.01
You're right, I noticed that fact already and I add 0.0049 to the 'e'
and 'n' (the largest value so rounding to 2 decimals doesn't show the
difference :-)).
Negative values for e and n are also possible? Oh, I'll try that. :-)
L.
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Changelog:
* extend the range from [0…2] to [0…4] with a non-linear scale.
* change the color to blue
* using Povray 3.7 -> artifacts at n≈0 disappear. :-)
But some superellipsoids look strange, i.e. e=2.5,n=0.5. Bug or intention?
Lars R.
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Attachments:
Download 'superelli4_big.png' (2658 KB)
Download 'superelli4_2.5_0.5.png' (20 KB)
Preview of image 'superelli4_big.png'
Preview of image 'superelli4_2.5_0.5.png'
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Negative e gives interesting objects, but negative n gives just dust.
Is there something like a bounded_by option because the objects seem to
extend the box <-1,-1,1-><+1,+1+1>...
Lars R.
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Attachments:
Download 'superellipsoid_negatives.png' (1409 KB)
Preview of image 'superellipsoid_negatives.png'
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This set of reference images would be useful in the POV-Ray manual.
Bye for now
Reuben
=====================================
Download 3D Lego models and other resources from:
http://www.pearse.co.uk/lego
=====================================
On 16/01/2012 16:59, Lars R. wrote:
> To visualize the effects of the two parameters of the superellipsoid I
> rendered this gallery.
>
> I hope you like it. :-)
>
> Lars R.
Post a reply to this message
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