Good news for mapmakers

[mdvalley]

I finally cracked the vertical L-Point code! Enjoy.

For the geog program:

void PlaceLpoint(Lpoint_T * data, float percentage)
{
Entity_T * moon;
Entity_T * planet;

double vecx, vecy, vecz, dist, x, y, z, angle;

moon = &geog_array[data->moon_index].entity;
planet = &geog_array[data->center_index].entity;

vecx = moon->x_pos - planet->x_pos;
vecy = moon->y_pos - planet->y_pos;
vecz = moon->z_pos - planet->z_pos;

dist = sqrt(vecx*vecx+vecy*vecy+vecz*vecz);

x = vecx/dist;
y = vecy/dist;
z = vecz/dist;

vecx = x*dist*percentage + planet->x_pos;
vecy = y*dist*percentage + planet->y_pos;
vecz = z*dist*percentage + planet->z_pos;

if ( z == -1 ) // To prevent divide by zero errors if a moon is straight north
{
data->orient1 = (float)0; // North
data->orient2 = (float)sqrt(1/2);
data->orient3 = (float)sqrt(1/2);
}
else
{

angle = acos(z)/2;

data->orient1 = (float)cos(angle);
data->orient2 = (float)(-y*cos(angle)/(z+1));
data->orient3 = (float)(x*cos(angle)/(z+1));
};

data->x_pos = vecx;
data->y_pos = vecy;
data->z_pos = vecz;
}


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