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I'm trying to simulate a lens as a texture in plastic, similar to the effect
of a lenticular or fresnel lens.
PovRay seemed to make sense to simulate the plastic, but oh what a learning
curve.
Wondered if anyone could point me to a texture library or tutorial to help
in this endeavour.
The plan is to design the shape ( thin plastic about 2mm thick ) and add an
underside repeating pattern texture that will let light arriving at the
normal through from above but not light that hits at a tight angle. Once
I've simulated this in PovRay and proven it, the texture will be used in the
CAD-CAM thats going to tooling for the injection moulding process. Many of
the engineering packages cannot do real ray tracing so they cannot simulate
the lens effect and I'm stuck .
Any help or pointers would really be appreciated.
--
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Simon Dyer nous apporta ses lumieres en ce 2005-12-05 06:03:
> I'm trying to simulate a lens as a texture in plastic, similar to the effect
> of a lenticular or fresnel lens.
> PovRay seemed to make sense to simulate the plastic, but oh what a learning
> curve.
>
> Wondered if anyone could point me to a texture library or tutorial to help
> in this endeavour.
>
> The plan is to design the shape ( thin plastic about 2mm thick ) and add an
> underside repeating pattern texture that will let light arriving at the
> normal through from above but not light that hits at a tight angle. Once
> I've simulated this in PovRay and proven it, the texture will be used in the
> CAD-CAM thats going to tooling for the injection moulding process. Many of
> the engineering packages cannot do real ray tracing so they cannot simulate
> the lens effect and I'm stuck .
>
> Any help or pointers would really be appreciated.
>
> --
>
>
>
My first bet would be to use the onion pattern as my normal. You may need to scale it
down some.
--
Alain
-------------------------------------------------
Judaism: Why does this shit always happen to us?
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"Simon Dyer" <sim### [at] paradise netnz> wrote:
> I'm trying to simulate a lens as a texture in plastic, similar to the effect
> of a lenticular or fresnel lens.
I don't think I've ever seen a fresnel lens done in POV. I did the basic
calculations for a 'spheric' fresnel a few years ago... they shouldn't be
too hard to find. I'll have to give it a go tomorrow.
> PovRay seemed to make sense to simulate the plastic, but oh what a learning
> curve.
Yes, but at least you have these forums to help ease that learning curve.
> Wondered if anyone could point me to a texture library or tutorial to help
> in this endeavour.
I only know the photons tutorial & example scene in the POV docs, but there
are a few people around who use POV for optical design work.
> The plan is to design the shape ( thin plastic about 2mm thick ) and add an
> underside repeating pattern texture that will let light arriving at the
> normal through from above but not light that hits at a tight angle. Once
> I've simulated this in PovRay and proven it, the texture will be used in the
> CAD-CAM thats going to tooling for the injection moulding process. Many of
> the engineering packages cannot do real ray tracing so they cannot simulate
> the lens effect and I'm stuck .
Sounds interesting.
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Alain <ele### [at] netscapenet> wrote:
> Simon Dyer nous apporta ses lumieres en ce 2005-12-05 06:03:
> > I'm trying to simulate a lens as a texture in plastic, similar to the effect
> > of a lenticular or fresnel lens.
> My first bet would be to use the onion pattern as my normal. You may need to scale
it down some.
I don't think normals are physically accurate enough for this job, Alain.
And the basic onion pattern won't give the proper surface gradients anyway.
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If you want to see my first attempt, see "green photons render" in
povray.binaries.images.
"Simon Dyer" <sim### [at] paradisenetnz> wrote in message
news:43941e80@news.povray.org...
> I'm trying to simulate a lens as a texture in plastic, similar to the
effect
> of a lenticular or fresnel lens.
> PovRay seemed to make sense to simulate the plastic, but oh what a
learning
> curve.
>
> Wondered if anyone could point me to a texture library or tutorial to help
> in this endeavour.
>
> The plan is to design the shape ( thin plastic about 2mm thick ) and add
an
> underside repeating pattern texture that will let light arriving at the
> normal through from above but not light that hits at a tight angle. Once
> I've simulated this in PovRay and proven it, the texture will be used in
the
> CAD-CAM thats going to tooling for the injection moulding process. Many
of
> the engineering packages cannot do real ray tracing so they cannot
simulate
> the lens effect and I'm stuck .
>
> Any help or pointers would really be appreciated.
>
> --
>
>
>
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Lets push this a bit - I read somewhere here how Povray could be used to
calculate distances for us - could we get photons or rays to design each
'pixel' of fresnel lens/lenticular to design a flat lens for a particular
purpose. For example, provide the start and target for a light path to take
through a refractive medium, and have that medium defined by povray?
"Simon Dyer" <sim### [at] paradisenetnz> wrote in message
news:439a0280@news.povray.org...
> If you want to see my first attempt, see "green photons render" in
> povray.binaries.images.
>
> "Simon Dyer" <sim### [at] paradisenetnz> wrote in message
> news:43941e80@news.povray.org...
> > I'm trying to simulate a lens as a texture in plastic, similar to the
> effect
> > of a lenticular or fresnel lens.
> > PovRay seemed to make sense to simulate the plastic, but oh what a
> learning
> > curve.
> >
> > Wondered if anyone could point me to a texture library or tutorial to
help
> > in this endeavour.
> >
> > The plan is to design the shape ( thin plastic about 2mm thick ) and add
> an
> > underside repeating pattern texture that will let light arriving at the
> > normal through from above but not light that hits at a tight angle.
Once
> > I've simulated this in PovRay and proven it, the texture will be used in
> the
> > CAD-CAM thats going to tooling for the injection moulding process. Many
> of
> > the engineering packages cannot do real ray tracing so they cannot
> simulate
> > the lens effect and I'm stuck .
> >
> > Any help or pointers would really be appreciated.
> >
> > --
> >
> >
> >
>
>
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