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Pick a sine or cosine function where you multiply the angle by an integer and add a random phase. Scale each by a random (pre-determined) amplitude. Add a constant larger than the sum of all the amplitudes. Profit. I'm not going to write this in C++ because, as you said, it won't add anything important to the algorithm. It may go like this:
Use 3D metaballs.. Randomly generate a set of points in 3D. 5 or less should work but you can vary this. For each voxel, compute the inverse distance (or some other function of the voxel and point co-ordinates) to each of the points and sum them.
When choosing the name of your blob, be careful when using any algorithm that generates a sequential number of some kind (either at the beginning or the end of the name of a blob). Azure Storage relies of the name for load balancing; using sequential values can create contention in accessing/writing to Azure Blobs because it can prevent Azure ...
Since we're looping a fixed number of times, we can technically write this all out by hand. I tried this once with a single random variable, r, that I kept reassigning, and performance tanked. But with four variables assigned random data up front, then using the lookup table, and applying the proper RFC bits, this version smokes them all:
For each iteration, you choose a cell at random, then follow a pointer chain to find its root. In the details from the root, you find its neighbours set. Choose a random member from that, then find the root for that, to identify a neighbouring region. Perform the union (point one root to the other, etc) to merge the two regions.
The problem is that the kind of random shapes shown in the question is not truely random. They are somehow smoothed, ordered, seemingly random shapes. While creating truely random shapes is easy with the computer, creating those pseudo-random shapes is much easier done by using a pen and paper. One option is hence to create such shapes ...
In the query above I have set the random number between 0-255 for each column, then I just put these values inside the function to generate a new color. If you need a reversed function that takes color's hexadecimal and return RGB value, you could use this function :
Is there any way to make MySQL user defined function that will return BLOB of random values with given size (for example first I want to test schema for 256KB BLOBs, later I want to test schema for 2MB BLOBs). Performance of this function is not very important. I can wait to generate test data for some time. (But for reasonable time)
1..n |> Enum.random() Depending on why exactly you want a 'random' number, you might be able to use System.unique_integer/1 as well. The following "returns an integer that is unique in the current runtime instance": System.unique_integer() A unique positive integer (which could be useful for generating 'random names'):
Math.random() in itself should be safe enough, what with 64-bit numbers. Even with imperfect generator, the chances of hitting the same number twice are minuscule. If you're after specifically integers, then multiply Math.random() by something BIG, like Number.MAX_SAFE_INTEGER.