Thread: should this algorithm work?

I am trying to randomly place stars a fixed distance away from a fixed point in space so it creates a sphere-like formation. So far it seems to be working, as in the stars look like they're in a sphere (as shown in the picture)

Here is my algorithm:
randomly choose x, y and z positions so that it is between positive and negative 600
Normalize the Position, this means it will have a distance of one from the center of the sphere (this is where I'm not sure if its true, I'm trying to test but I am getting screwy values)
Then multiply the position by the distance away from the center that you want (again, i am getting screwy values testing but my math in the testing phase could be wrong)

Does the algorithm seem like it should work? The sphere to the left is what I'm creating, but I'm not sure if the distance from the center to each star is what I want

Well I generate points randomly on some scale. I then normalize the points on the sphere, and then multiply by the fixed distance to ensure it is x units away from the center. Here is the code

Code:

	Position.x = ((int)rand()%1200) - 600;
	Position.y = ((int)rand()%1200) - 600;
	Position.z = ((int)rand()%1200) - 600;

	Position.Normalize();
	Position.x *= 1000;

	Position.y *= 1000;

	Position.z *= 1000;

I didn't use my own operators because at the time I wrote this I was modifying my vector class. What this does is generate a position. Each component of the vector is assigned a random value from -600 to 600. It is then normalized so that the point is exactly 1 unit away from the center (that is the thinking anyway, I'm not sure if it works because i get screwy values when I am testing, and I'm still fixing the math on that aspect). Once the point is normalized, the vector is multiplied by the distance it is supposed to be from the center, in this case 1000.

As long as your normalization is correct and actually produces a vector of unit length 1, then I don't see any reason why this wouldn't work.

Post your math if it is giving you problems.

Its okay I've solved the problem anyway. What do you mean by address?? A web address? I honestly don't know what you mean. I know that when you aren't logged in you cannot have the options of posting pictures anyway. Also you must make sure you are uploading a supported file type (gif jpg png txt zip bmp jpeg cpp c h hpp)