William F Pokorny <ano### [at] anonymousorg> wrote:
> I acted on my yearly urge to do a Pov-Ray pumpkin.
>
> The isosurface using the base, shape and texture functions is in the
> upper left of the image. All other pumpkins are deformations of those
> functions as additional isosurfaces. The original image is a third
> larger than that attached and rendered in about 12 minutes with one
> light and radiosity.
>
> Bill P.

Those are very good pumpkins. Procedural texture?

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On 09/14/2014 10:28 AM, jhu wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
>> I acted on my yearly urge to do a Pov-Ray pumpkin.
>>
>> The isosurface using the base, shape and texture functions is in the
>> upper left of the image. All other pumpkins are deformations of those
>> functions as additional isosurfaces. The original image is a third
>> larger than that attached and rendered in about 12 minutes with one
>> light and radiosity.
>>
>> Bill P.
>
> Those are very good pumpkins. Procedural texture?
>
Thanks all.

I didn't spend too much time on the textures & agree most pumpkins are 
uglier & more varied - especially across varieties and sizes.

The texture for the surface of the pumpkin is a slightly variable color 
about a core color plus normal bumps scaled very small to add some 
graininess.

The rest of the effect comes from the pumpkin shape being formed with 
the aid of a spherical displacement map. The spherical map was created 
in Pov-Ray ahead of time using the spherical camera and it gets used for 
the rind and meat sub-functions of the total shape's function.

I thought a little about adding guts, but I plan to use it first for a 
Happy Halloween Jack-o'-lantern. For the lantern, the guts would have to 
be cleaned out and I didn't want to deal with that slimy mess! ;-)

No, I didn't start with Mike's parametric apple, but some of the 
underlying math is similar.

Bill P.

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On 14-9-2014 19:03, William F Pokorny wrote:

> I didn't spend too much time on the textures & agree most pumpkins are
> uglier & more varied - especially across varieties and sizes.
>
> The texture for the surface of the pumpkin is a slightly variable color
> about a core color plus normal bumps scaled very small to add some
> graininess.

Imo, that is spot on.

>
> The rest of the effect comes from the pumpkin shape being formed with
> the aid of a spherical displacement map. The spherical map was created
> in Pov-Ray ahead of time using the spherical camera and it gets used for
> the rind and meat sub-functions of the total shape's function.

[Did I note /spherical camera/ on my todo list? Hmmm... yes I did. three 
times actually.]  :-)

Thomas

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William F Pokorny <ano### [at] anonymousorg> wrote:
> I acted on my yearly urge to do a Pov-Ray pumpkin.
>
> The isosurface using the base, shape and texture functions is in the
> upper left of the image. All other pumpkins are deformations of those
> functions as additional isosurfaces. The original image is a third
> larger than that attached and rendered in about 12 minutes with one
> light and radiosity.
>
> Bill P.

These are great, the shape is perfect (for a perfect pumpkin of course which is
tough to find, they are mostly distorted in a non symmetrical manner).

I am jealous of your isosurface skills though.

Sean

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Am 15.09.2014 11:40, schrieb s.day:

> I am jealous of your isosurface skills though.

Not just you, Sean. Not just you.

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Le 14/09/2014 13:28, William F Pokorny a écrit :
> I acted on my yearly urge to do a Pov-Ray pumpkin.
>
> The isosurface using the base, shape and texture functions is in the
> upper left of the image. All other pumpkins are deformations of those
> functions as additional isosurfaces. The original image is a third
> larger than that attached and rendered in about 12 minutes with one
> light and radiosity.
>
> Bill P.
Good work Bill, maybe you can add some (little) perturbations in the 
surface...

-- 
Do not judge my words, judge my actions.

---
Ce courrier électronique ne contient aucun virus ou logiciel malveillant parce que la
protection avast! Antivirus est active.
http://www.avast.com

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William F Pokorny <ano### [at] anonymousorg> wrote:
> I acted on my yearly urge to do a Pov-Ray pumpkin.
>
> The isosurface using the base, shape and texture functions is in the
> upper left of the image. All other pumpkins are deformations of those
> functions as additional isosurfaces. The original image is a third
> larger than that attached and rendered in about 12 minutes with one
> light and radiosity.
>
> Bill P.

way better than my ISO pumpkin... code please?

Regards,
A.D.B.

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"Anthony D. Baye" <Sha### [at] spamnomorehotmailcom> wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
> > I acted on my yearly urge to do a Pov-Ray pumpkin.
> >
> > The isosurface using the base, shape and texture functions is in the
> > upper left of the image. All other pumpkins are deformations of those
> > functions as additional isosurfaces. The original image is a third
> > larger than that attached and rendered in about 12 minutes with one
> > light and radiosity.
> >
> > Bill P.
>
> way better than my ISO pumpkin... code please?
>
> Regards,
> A.D.B.

now you've got me going... only thing I can't quite figure out is the stem.

Regards,
A.D.B.

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Attachments:
Download 'isopumpkin.png' (40 KB)

Preview of image 'isopumpkin.png'

From     http://www.econym.demon.co.uk/isotut/real.htm

"The ln(1 - v*0.3157) bit in Fz becomes significant when v approaches pi (0.3157
is just a little lower than 1/pi). It creates the stalk."

I find this absolutely amazing.

Next thing you know these guys will be modeling pomegranites and such...  :D

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On 09/16/2014 06:17 PM, Anthony D. Baye wrote:
>
> way better than my ISO pumpkin... code please?
>
> Regards,
> A.D.B.
>
Anthony, I've posted the code to p.b.scene-files.

Sean, As an isosurface the pumpkin can be made lumpy with the right 
deformation though suppose to keep it from affecting the stem too much 
it might need to be applied before the stem is added. Further, given the 
displacement map approach, it is also possible to edit/change that map 
and get some further variations in the surface but the depth of those 
will be limited to the scale of the displacement.

All, The isosurfaces in the zip are set up with all intersections on so 
it should be you can pick your pumpkin without change and hack away at 
it with CSG to carve a pumpkin. Probably the Meat texture needs some 
work so as to glow a bit - double illuminate. Not yet gotten to carving 
my own pumpkin!

Bill P.

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