/**
* @param pt
* @return the grid coordinates for a given point
*/
protected int[] getGridCoordinate(float[] pt) {
int[] ret = new int[3];
for (int xyz = 0; xyz < 3; ++xyz) {
double min = Double.POSITIVE_INFINITY;
int idx = -1;
for (int i = 0; i < grid[xyz].length; ++i) {
double dist = Math.abs(grid[xyz][i] - pt[xyz]); // N1 norm
if (dist < min) {
min = dist;
idx = i;
}
}
ret[xyz] = idx;
}
return ret;
}
