YoyoApp.java example In the J3D package...

843799

YoyoApp.java example In the J3D package...

private Geometry yoyoGeometry() {

TriangleFanArray tfa;
int N = 17; //This mean 17 vertexs right?
int totalN = 4*(N+1); //What is this mean?
Point3f coords[] = new Point3f[totalN];
int stripCounts[] = {N+1, N+1, N+1, N+1};//
And what is this?Thank you.
float r = 0.6f;
float w = 0.4f;
int n;
double a;
float x, y;

843799

If i remember correctly:
N = total vertices in a single fan (not including central point)

totalN = total vertices for the whole yoyo (4 fans so 4*(n+1) total ).

int stripCounts[] = {N+1, N+1, N+1, N+1}
Specifies 4 fans (since array of length 4) each with N+1 vertices.

Basically there is one TriangleFanArray, but this allows multiple triangle fans within it. The coords are stored in one long array and the stripCounts specifies how many individual fans and how long they all are.