Alternate Mapping: Orbit Trap
The Fractal Science Kit fractal generator Alternate Mapping Orbit Trap defines the alternate value in terms of an orbit trap.
See also:
The Orbit Trap properties pages are:
These pages are as described for Orbit Trap. The only difference is that the Controllers page is omitted and the Properties page is added.
The Properties page supports several properties to control the results.
Properties can be used to control what orbit points to consider (see Orbit Generation below), the maximum value allowed for the returned value (Max Value), and the value used for the alternate index (Index Map).
As stated above, Max Value is the maximum value allowed for the returned value. In normal orbit trap processing, only points whose trap (absolute) value is less than or equal to 1 are processed. When the orbit trap is used in conjunction with an alternate mapping however, all trapped points are processed, even if the point's trap value is greater than 1. The alternate value is the set to the point with the minimum (absolute) value over all the processed points. When the minimum value is greater than Max Value, the alternate value is set to Max Value.
Orbit Generation
The Orbit Generation section defines 3 properties: Min Dwell, Max Dwell, and Mod Dwell. These values control the set of orbit points that are considered when looking for the minimum value. Min Dwell is the 1st dwell to check. Max Dwell is the last dwell to check. Mod Dwell - 1 is the number of dwells to skip between checks. That is, a dwell is processed if the dwell is between MinDwell and MaxDwell inclusive, and (dwell - MinDwell) % ModDwell = 0.
Orbit Trap Data Mapping
The alternate point's Value is set to the minimum trapped point value (trappedPoint.Value).
The alternate point's Angle is set to the minimum trapped point angle (trappedPoint.Angle).
The alternate point's Index is set to the value given by Index Map. Index Map is one of the following:
- Combined Index
- Trap Index
- Trap Delta
- Trap Dwell
Trap Index equates to trappedPoint.Index. Trap Delta equates to trappedPoint.Delta. Trap Dwell equates to the dwell value for the minimum trapped point.
Unlike these other settings, Combined Index is not useful for coloring. However, since the Combined Index combines the other index values to form a unique value and Index is used by Solid Guessing to determine if 2 samples are equal, differences in the index values will cause the samples to be seen as not equal, which will improve the visible results of Solid Guessing. So the recommendation is to use Combined Index for Index Map unless you need to use the index for coloring.