3D points on globe connecting

vvvv beta question
1

Hey,

i have a 3D globe. I want to connect 2 points on the globe. I get the points by an IP adress. With this adress i make a request to a server which gives me back the longitude and latitude. Now I want to connect two of these points to each other. What is the best way to do it?

Greeting
Puschek

2

have a look at this contribution. it just needs some start and end points to connect:

3

If im not wrong, the Splines only use one XYZ-coordinate, which means it is not good for my case, since I have an attacker and a defensiv land.

I looked into the patch and i only found one variable of XYZ. It seems that you cantroll one end of the line it draws with it. But i couldn’t find the 2. XYZ variable to maipulate.

4

ok, so is your question is how you can convert the longitude/latitude values to XYZ coordinates?

if not, maybe try to describe the steps you want to do in more detail.

5

also look into the file vvvv\girlpower\worldcities.v4p, it draws points for cities on a globe.

and the section “geographical coordinates” in this blogpost might help you:

6

Ok. First i need to convert longitude and latitude into XYZ coordinates. Thats right. But i have something in mind how to do it.

After i did this, i need to connect 2 XYZ coordinates on a globe with something like an arrow which goes around the globe. I am trying to do something like a globe, on which you can see diffrent hacker attacks from one to another IP adress.

But i will look your input first! Maybe it will help me. Thanks alot, i will reply if i need some more help or im finished with my project :)

7

Hey, the input you have me is pretty good. But I still have some problems. I convert my Input into Cartesian System and try to draw it on the globe. And it is allways off. I played around with some values but it seems i cannot finde the problem. Is there anyway how i could upload my project and someone could look over it?

Edit:
Ok, it seems i calculate the Latitude right and i get something wrong with the Longitude. I use the girlpower patch you showed me and copied the funktions. I modified them a little bit for my use. Now i just recalculated the XYZ vector to longitude and latitude so i can see what is going wrong. If i put them on google maps it shows me the same point as in my globe. So it seems something is wrong with my longitude math.

Maybe i should mention, i get them in the Dezimal form like : 43.3215 not in the other form wiht NSWE in it.
_Puschek

8

It seems i found the error:

Since i allready have Negativ Values inside my data, i had to multiply them with negativ 1. Since i did this everything seems to work fine.

Now i have to find a way to connect 2 Points on my globe with an Arrow or something. This is just the last point i have to make for my project.

If anyone got an idea, please tell me.

Thanks
Puschek

9

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