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>
><snip>
> should be rather
> <snip
>
> #local Z_Min = -100;
Z = -1000?
The only part of your process that I do not understand is the bounding
process. Are the bounds chosen arbitrarily, or is there a method for
assigning bounds?
-Shay
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Never mind. I just figured it out.
Shay <sah### [at] simcoparts com> wrote in message
news:3cab8298$1@news.povray.org...
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On Wed, 3 Apr 2002 16:31:50 -0600, "Shay" <sah### [at] simcopartscom> wrote:
> The only part of your process that I do not understand is the bounding
> process. Are the bounds chosen arbitrarily, or is there a method for
> assigning bounds?
Bounding is necessary to rescale value from space to 0-1 entry for color map in
color component and then rescale back to original value. Every scaling requires
origin of scaling and scale value - here they are min and range value.
Presented values are randomly choosed without any important rule. My suggestion
is to use something like:
#local X_Max = 1e5;
#local X_Min = -X_Max;
and the same for Y and Z.
You have to remember that outside bounding results can be wrong.
ABX
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I'm going to time this method tonight against <get_x, get_y, get_z> and
macro.
I will post the results tomorrow.
I understand why you are scaling the results to an appropriate range for the
color map, but is it really necessary. Can a pigment function not return
values greater than 1 for a hue? I know that Povray will accept {rgb
<100,30,80>} or even {rgb <-1,-1,-1>}. Does a pigment function behave
differently? I will test this tonight.
-Shay
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On Wed, 3 Apr 2002 17:00:25 -0600, "Shay" <sah### [at] simcopartscom> wrote:
> I understand why you are scaling the results to an appropriate range for the
> color map, but is it really necessary. Can a pigment function not return
> values greater than 1 for a hue?
Pigment can return values greater than 1. My methor return values greater than
1. Only problem is that map entries are placed along <0,1> range.
ABX
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On Wed, 3 Apr 2002 17:00:25 -0600, "Shay" <sah### [at] simcopartscom> wrote:
> I understand why you are scaling the results to an appropriate range for the
> color map, but is it really necessary.
'6.7.1.3 Color Maps' second paragraph
ABX
--
disc{z,-z#macro O()asc(substr("-+((1*(,1,/.-,*/(,&.323/'1"e,1))*.1-4#declare
e=e-1;#end#local e=26;5pigment{#local g=function(_){ceil(_)-_}function#local
k=function{pattern{object{sphere_sweep{linear_spline 13#while(e)<O(),O()//35
>.01#end}}}}{k(g(atan2(x,y)),g(ln((y+x)^2+1e-5)),0)}}finish{ambient 1}}//ABX
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