This topic is 2937 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

## Recommended Posts

Hi

I have two points (A,B) and I want to create a set of random points between the two, such that most points are close to A and the number of points decreases linearly towards B. Does anyone know a simple way to solve this?

Thanks

##### Share on other sites
Random number generators generating values between zero and one with an uniform distribution are common. You can take the squared output of such a generator, and then use to to scale the vector (B-A) and add it to A.

In pseudocode:
 uniformRand = rand(); outputPoint = A + uniformRand*uniformRand * (B-A); 

##### Share on other sites

I have two points (A,B) and I want to create a set of random points between the two, such that most points are close to A and the number of points decreases linearly towards B. Does anyone know a simple way to solve this?

It sounds like you need to generate random numbers on a geometric or exponential distribution. If you're using C++ and your development environment supports the current ISO standard, you can just use [font="Courier New"]std::geometric_distribution[/font] or [font="Courier New"]std::exponential_distribution[/font] from [font="Courier New"]<random>[/font]. If you're not in that situation, you can try to write them yourself, it's not that difficult.

##### Share on other sites
Thanks for the reply guys Rene Z's response worked perfectly for my situation (I'm not using C++), but I will look into std::geometric_distribution and std::exponential_distribution just out of interest, so thanks for that Bregma.

• ### Game Developer Survey

We are looking for qualified game developers to participate in a 10-minute online survey. Qualified participants will be offered a \$15 incentive for your time and insights. Click here to start!

• 15
• 21
• 25
• 11
• 25