[Grasshopper] How to use Random to output random numbers

This article explains how to use Random to output random numbers.

On the Grasshopper, it is represented by either of the two above.

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Outputting Random Numbers

Random can be used to output random numbers.

Enter a range of numbers in the Random(R).

Initially, Construct Domain is used to create a range of 0~100.

The Random(N) is used to input the number of numbers to be output.

Initially, 10 is entered.

The Random(S) is used to input a seed value number that changes the randomness.

If a number between 0 and 100 is input to the Number Slider, 100 different random numbers can be generated by changing the number.

At first, we entered 20.

Then, in the above image, 10 random numbers were created within the range of 0~100.

You can also specify the range of numbers on the Random(R) with a letter.

You can also specify the range in this way by entering a numeric value To numeric value in the Panel.

In the image above, 0 To 100 is entered.

I changed the maximum value of the range from 100 to 50.

Then, the output value no longer exceeds 50.

Increasing the number of values on the Random(N) increases the number of numbers output.

This time, we changed the value from 10 to 20.

Now 20 numbers are output.

If the number is set to 5, only 5 numbers are output.

Changing the value on the Random(S) changed the randomness of the output numbers.

The image above shows the case where the seed value is set to 50.

This is the case with a seed value of 79.

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Example of using Random

Let’s try to create an example like the image above using Random.

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Components used: (1) Rectangle ( 2 ) Surface (3) Divide Domain² (4) Isotrim ( 5 ) Area (6) Multiplication (7) Random (8) Scale (9) Deconstruct Brep ( 10 ) Curve (11) Ruled Surface

First, create a rectangle using Rectangle.

This time, enter 100 for the Rectangle’s X and Y values, and set the length of the sides to 100.

Next, connect the Rectangle to the Surface to make the rectangle into a surface.

We then use Divide Domain² and Isotrim to divide the surface.

Connect Surface to the Divide Domain²(I).

This time, input 10 to the Divide Domain²(U and V) and divide the surface by 10 x 10.

Connect the surface to the Isotrim(S) and connect Divide Domain² to the Isotrim(D).

The surface is now divided.

Connect Isotrim to Area to get the center point of each divided surface.

We then connect 10, the number of divisions used in Divide Domain², to the Multiplication(A and B) and multiply.

Then, set the R range of Random to 0~1.

Connect Multiplication to the Random(N).

Input an appropriate seed value to the Random(S).

A random number between 0 and 1 is then created.

This will be the multiplying factor when changing the scale later.

Then, connect Isotrim to the Scale(G).

Connect the Area(C) to the Scale(C).

Connect Random to the Scale(F).

Now the size of each surface changes randomly.

Then, use Deconstruct Brep on the original surface and the resized surface to extract the borders.

Then, we connect each Curve to the Deconstruct Brep(E).

As you can see, the border has been extracted.

Finally, connect the two Curves to Ruled Surface to create a surface that connects the two borders.

This completes the process.

List of Grasshopper articles using Random component↓