Sounds interesting.  In other words, using any pattern type to turbulate another
pattern with.  The difficulties might be in how the octaves, omega, and lambda
are to be applied maybe since those are all put into the equation, so to speak.
What I can't imagine too well is how it would go about affecting the pattern to
be perturbed because it seems that to do so without the usual turbulence would
just be a overlaying of another pattern on top of the other to various degrees.

Bob

"Ken" <tyl### [at] pacbellnet> wrote in message
news:38B39E26.CE88C3AE@pacbell.net...
|
| My understanding and experience with turbulence show that when applied
| to a pigment pattern or surface normal the pattern is affected by some
| form of pseudo random perturbation of the pattern it is applied to. In
| many cases this is enough but there are times it would be nice to be
| able to precisely predict how the pattern will be affected by the
| turbulence modifier.
|
|  Even better would be a way to specify a user defined pattern to the
| turbulence such as one of the predefined wave types that may be used
| with patterns themselves. When a user specifies a specific wave type
| with a pigment/normal pattern the wave type chosen affects the slope
| of that pattern. The idea with adding a pattern to the turbulence would
| be to actually perturb the pattern itself in predictable patterns
| rather than just the existing psuedo random pattern that is implemented
| now.
|
|   For example if you were using a simple gradient pigment pattern and
| applied a triangle wave to the turbulence of the pattern the resulting
| pigment pattern would look like this:
|
|  /\/\/\/\/\/\/\
|
| rather than the normal unpredictable result like this:
|
| ---\_____----~~~\
|
|
| Suggested format would be:
|
| turbulence [float/vector] [Wave_Type]
|
|   The questions that arise are if this would be possible, is it already
| possible using an existing method, and if it would be a useful function
| that people would use. I know that iso-pigments rise to this challenge
| to a certain degree but unless you are some form of mathematical genius
| it is not really a good alternative for the mathematicaly challenged.
|
|
| Personally I think it would make for some very interesting results and
| would add a lot more power to the existing turbulence function.
|
| --
| Ken Tyler -  1300+ Povray, Graphics, 3D Rendering, and Raytracing Links:
| http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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