On Fri, 2007-05-11 at 14:37 -0400, Hal Lane wrote:
As the View Window size is increased by changing the Size Reduction Factor from 8 to 6 to 4 the number of horizontal streaks decreases.
The fractal calculates correctly when the View Window is turned off. Parm file is below.
Increase periodicity to 15.
I had thought that passes=1 kept these streaks from appearing...
No, the periodicity checking is failing. Periodicity is checking to see if the iteration is converging. By increasing the periodicity, the X and Y values of the iterations must be closer together for the check to decide that periodicity has been detected. We do this because if the iteration is periodic (moves around in a circle), we can be relatively assured that the iteration will not escape. Hence the pixel is in the lake. A good description of this is in the "Periodicity Logic" section of the Fractint documentation. Jonathan