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Hi
I think it the Ken Map would work better if you are not just fading from red to
transparent red.
Try to fade to transparent White.
I mean the following
color_map {
[0 color rgbf <1,0,0,0>]
... <- i still don't know why it is
nesscesary to make multiple entrys ?
[1 color rgbf <1,1,1,1>]
}
Spider schrieb:
> Ken wrote:
> >
> > Marc Schimmler wrote:
> > >
> > > I'm just wondering if it is possible to make an object which
> > > transparency that changes with it's height?
> > > Imagine a cylinder which is nearly total transparent at it's bottom and
> > > and fully opaque at the top.
> > >
> > > Any help appreciated from indenters as well as from non-indenters!!! ;-)
> > >
> > > Thanks in advance,
> > > Marc
> > > --
> > > Marc Schimmler
> >
>
> > Note to Spider:
> > While your example was both a creative and fanciful example of
> > blending solid and transparent pigments it really didn't address
> > Marc's requirements for a gradual transition from clear to solid.
> > Marc may well take note of your example as it does show one of the
> > often under used and powerful features of creative texturing. The
> > one main fault with your example is that it is difficult at best
> > to get a totally transparent blend from one end of an object to the
> > other with only two entries in your color map (not to mention the
> > large amounts of turbulence used). Three pallet entries are almost
> > mandatory and four of more offer considerably greater control of the
> > patterns function.
> Yes, I understand and agree with you, but I thought your example was so
> good at adressing the use of multiple entries in a colour_map that I
> don't needed to add those(forgot is abetter explination)
>
> as for the turbulence, it was mostly a joke, but with a more serious
> tone to it.
>
> I've taken the right to render an example with both our variants.
> I'll convert to jpg. and upload to binaries.images.
>
> Here is the source.
> look here in the beginning. I haven't made an attempt to make my code
> look like ken's, notr the results.
>
> #version 3.1;
> #declare SpidMap =
> color_map {
> [00/10 color rgbt <1,0,0,1> ]
> [01/10 color rgbt <1,0,0,1> ]
> [09/10 color rgbt <1,0,0,0> ]
> [10/10 color rgbt <1,0,0,0> ]
> }
> #declare KenMap =
> color_map{
> [00/10 rgbf<1,0,0,1.0>]
> [01/10 rgbf<1,0,0,1.0>]
> [01/10 rgbf<1,0,0,1.0>]
> [02/10 rgbf<1,0,0,0.9>]
> [03/10 rgbf<1,0,0,0.8>]
> [04/10 rgbf<1,0,0,0.7>]
> [05/10 rgbf<1,0,0,0.6>]
> [06/10 rgbf<1,0,0,0.5>]
> [07/10 rgbf<1,0,0,0.4>]
> [08/10 rgbf<1,0,0,0.3>]
> [09/10 rgbf<1,0,0,0.2>]
> [10/10 rgbf<1,0,0,0.0>]
> }
>
> global_settings { assumed_gamma 1.0 }
> camera {
> location <0.0, 0.5, -4.0>
> direction 1.5*z
> right 4/3*x
> look_at <0.0, 0.0, 0.0>
> }
>
> sky_sphere {
> pigment {
> gradient y
> color_map { [0.0 color blue 0.6] [1.0 color rgb 1] }
> }
> }
>
> light_source { <-30, 30, -30>,color rgb 1 }
> plane { y, -1 pigment {color rgb 1} finish{ambient 0 }}
>
> //Top left
> cylinder {
> <0,1,0>,<0,0,0>, 0.6
> texture {
> pigment {
> gradient y
> color_map { SpidMap }
> }
> finish{ specular .2 }
> }
> translate -0.7*x
> translate 0.1*y
> }
>
> //lowLeft
> cylinder {
> <0,1,0>,<0,0,0>, 0.6
> texture {
> pigment {
> gradient y
> turbulence <0.3,1.2,0.2>/100
> octaves 3600 //ou _are_ patient, aren't you *smile*
> omega 1/24
> lambda 0.2
> color_map { SpidMap }
> }
> finish{ specular .2 }
> }
> translate -0.7*x
> translate -0.99999*y
> }
> //low right, Ken's method
> cylinder {
> <0,1,0>,<0,0,0>, 0.6
> texture {
> pigment {
> gradient y
> color_map{ KenMap }
> }
> finish{ specular .2 }
> }
> translate 0.7*x
> translate -0.99999*y
> }
>
> //top right, Ken's method
> cylinder {
> <0,1,0>,<0,0,0>, 0.6
> texture {
> pigment {
> gradient y
> turbulence <0.3,1.2,0.2>/100
> octaves 3600 //ou _are_ patient, aren't you *smile*
> omega 1/24
> lambda 0.2
> color_map{ KenMap }
> }
> finish{ specular .2 }
> }
> translate 0.7*x
> translate 0.1*y
> }
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