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Rock Starting: Seeders
Seeders are the means by which you specify the initial conditions of falling rocks. Each of the initial conditions (position/location, mass, and velocity) can be specified with exact numbers, or with a Normal probability distribution. The number of seeders, or the number of seeder locations that you can add to a model are unlimited.
Initial conditions of each seeder can be specified with exact numbers (0 Std Dev.) or with a Normal probability distribution
There are two types of seeders provided in RocFall: "point seeders" and "line seeders". Both types of seeders allow you to specify normal distributions defining the horizontal velocity, the vertical velocity, the mass and the angular velocity of the rocks that will be thrown down the slope.
Add Point / Line Seeder options under Rocks menu
Point Seeders are used when you want to specify that all rocks fall from a single starting location (the top of the slope, for example). Line Seeders are used when you want to specify a set of starting locations. For example, you can specify all rock falls to begin from the first slope segment. A seeder line can have any number of segments. The rock locations are generated with a Uniform distribution along the length of the line seeder, i.e. there is an equal probability that the rock will start falling from any point along the length of the seeder.
A Point Seeder is represented by a blue cross. A Line Seeder is a blue line extended between two black crosses. The rock path of the point seeder is displayed in sky blue.
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Pseudo-Random Simulation
By default, RocFall uses true random number generation to sample the input data distributions. Different analysis results and rock paths are generated each time Compute is selected because a different "seed" number is used each time the random number generator is called.
On the other hand, Pseudo-Random option in the Project Setting dialog allows the same "seed" number to be used each time to generate reproducible results for a RocFall analysis. RocFall also allows the user to specify a seed number for the Pseudo-Random option. Changing the seed number will give different analysis results. However, for a given seed number, results will always be the same.
Enter a specified seed number for the Pseudo-Random option
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