Slope Formula Tutorial for UltraFractal - Page 2


Basic Usage

If Direct Color Slope is used for coloring the slope formula you probably won't have to use a gradient, as optimal coloring for most purposes is provided directly by the formula. For the Lighting ucl and 3D Texturizer Enhanced III the gradient is of paramount importance if the user wants to obtain an optimal 3D effect with predictable lighting. With these last two coloring formulas try starting with the following gradient:

Silver Lighting Gradient

The next image is for the SlopeExp (Mandelbrot) formula with the Direct Color Slope Coloring formula. The defaults for all the parameters were used.


To zoom into an image the value of the height pre-scale needs to be reduced. A good starting point is the reciprocal of the magnification on the location tab. The next image (Mandel2) is a zoom into the Mandelbrot set of about 70000. The value of the height pre-scale was decreased to 5e-6. For the following images 3D Texturizer Enhanced III was used as the coloring formula along with the silver lighting gradient shown above. Subsequent images show the effects of other parameters. In Mandel3, Orbit Separation was increased to 1e-6, which caused blurring and distortion of the image. In Mandel4, the Transfer Function was changed to log, giving too much contrast to the height values. This may actually be a desired effect for some images. To adjust the height values, the user will find that changing Height Pre-Scale is not very effective. When height adjustments are made for a Transfer Function other than linear, Height Post-Scales works best (Mandel5).


Height Pre-Scale = 5e-6
Orbit Separation = 1e-8
Orbit Separation = 1e-6
Height Transfer = log
Height Post-Scale = 0.025
Height Transfer = log
Height Post-Scale = 5e-6


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