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DarkBASIC Professional Discussion / Inside triangles in space

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Programmer X

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Joined: 14th Nov 2007

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Posted: 21st Jan 2014 22:21

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Trying to pull off a inside 3d Triangle algorithm using spherical coordinates do you see why it prints nothing?(The following is a part of it in C++ the program is attached)

int pnpoly(int nvert, float *vertx, float *verty, float testx, float testy)
{
int i, j, c = 0;
for (i = 0, j = nvert-1; i < nvert; j = i++) {
if ( ((verty[i]>testy) != (verty[j]>testy)) &&
(testx < (vertx[j]-vertx[i]) * (testy-verty[i]) / (verty[j]-verty[i]) + vertx[i]) )
c = !c;
}
return c;
}

XXX