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Christoph Hormann <chr### [at] gmx de> wrote:
> Not being able to use splines in isosurface functions would be really bad
> IMO.
How do you use splines in isosurface functions?
--
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// - Warp -
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On 22 Feb 2002 06:16:10 -0500, Warp <war### [at] tagpovrayorg> wrote:
> That's quite longer.
But possible in simple way. And anybody can modify this macro to distribute
points of array with parameter distributed other way (t^2, sqrt(t)).
> And it needs you to repeat points (<2,1,0> above).
Well, is this realy problem ? You can create main keys as variables. There is
many solutions in POV basad on storing things in variables.
> Compare to the equivalent in my proposal:
> #local Spline=spline{ {0,<0,0,0>} <1,0,0> {1,<2,1,0>} <3,2,1> {2,<2,2,2>} }
looks like alternative and interesting solution
ABX
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Warp wrote:
>
> How do you use splines in isosurface functions?
>
http://www.povray.org/working-docs/id000141.html#6_1_6_3
http://www.econym.demon.co.uk/isotut/more.htm
Christoph
--
POV-Ray tutorials, IsoWood include,
TransSkin and more: http://www.tu-bs.de/~y0013390/
Last updated 21 Feb. 2002 _____./\/^>_*_<^\/\.______
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On 22 Feb 2002 06:18:24 -0500, Warp <war### [at] tagpovrayorg> wrote:
> How do you use splines in isosurface functions?
http://news.povray.org/0fm17ucj8h2rpb7u6ia5r5kuvd7ql58jb2%404ax.com
ABX
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Warp wrote:
>
> Christoph Hormann <chr### [at] gmxde> wrote:
> > Not being able to use splines in isosurface functions would be really bad
> > IMO.
>
> How do you use splines in isosurface functions?
http://www.econym.demon.co.uk/isotut/more.htm
--
Ken Tyler
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"Warp" wrote:
> Rune wrote:
> > But for basic spline usage, the syntax and use
> > is much easier with the spline{} feature.
>
> I strongly disagree.
> Suppose that you are making a spline with
> evenly-distributed time values:
You keep talking about evenly distributed values. Suppose you want UNevenly
distributed values. That's *impossible* if you don't use the spline feature!
If you do want evenly distributed values, use a macro that takes an array as
input and fills in the time values for you. There you go, an easy solution
both with and without evenly distributed values. Tell me again how you do
that without the spline feature?
> Using the current spline syntax is certainly not
> "much easier". In fact, it's a lot more tedious and
> difficult.
If you refuse to use a macro to fill in evenly distributed time values, then
you're right. But why would you do that?
Rune
--
3D images and anims, include files, tutorials and more:
Rune's World: http://rsj.mobilixnet.dk (updated Feb 16)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Webring: http://webring.povray.co.uk
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Warp <war### [at] tagpovrayorg> wrote in news:3c761b7b@news.povray.org:
> But with an existing macro you can achieve the same thing with a lot
> less work. For example:
>
> #declare Points = array[6]
> { <1,1,1>, <2,2,2>, <3,3,3>, <3.5,3.5,3.5>, <4,4,4>, <5,5,5> }
>
> CreateSpline(Points)
Quoted code is from your own post:
#macro CreateSpline(cspoints)
// Keep parameter names lowercase to prevent
// name collisions with functions and other macros.
> spline
> { cubic_spline
> #declare Ind = 0;
#declare EndInd = dimension_size(cspoints, 1)-1;
> #while(Ind <= EndInd)
Ind/EndInd, cspoints[Ind]
> #declare Ind = Ind+1;
> #end
> }
#end
> Using the current spline syntax is certainly not "much easier". In
> fact, it's a lot more tedious and difficult.
Macros will fix that.
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Warp <war### [at] tagpovrayorg> wrote in message news:3c75fe70@news.povray.org...
> Why have an unfinished internal implementation with a lot to be desired
> when there are excellent spline include files out there which support the
> same features and a lot more, and are even easier to use?
Because I can accelerate and decelerate (or not) across the spline the way
that I want to.
Because I really like the form of the natural spline (this may be part of
the includes you mentioned.)
-Shay
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Warp wrote in message <3c7601ff@news.povray.org>...
> By the way, any chance of making the time values optional?
> Forced time values are a real bother, and they usually cause more trouble
>than they are worth.
No. The time for feature requests is over, particularly for difficult
feature requests such as this.
--
Mark
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"Mark Wagner" wrote:
> The time for feature requests is over, particularly
> for difficult feature requests such as this.
As long as the feature is marked as experimental there's still hope for
future versions of POV-Ray... ;)
Rune
--
3D images and anims, include files, tutorials and more:
Rune's World: http://rsj.mobilixnet.dk (updated Feb 16)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Webring: http://webring.povray.co.uk
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