for(float y = bbox.p1.y - cell_height; y < bbox.p2.y + cell_height; y += cell_height) {
for(float x = bbox.p1.x - cell_width; x < bbox.p2.x + cell_width; x += cell_width) {
int gridx = int(x / cell_width);
int gridy = int(y / cell_height);
if(gridx < 0 || gridy < 0
|| gridx >= int(cells_x) || gridy >= int(cells_y)) {
for(float y = bbox.p1.y - cell_height; y < bbox.p2.y + cell_height; y += cell_height) {
for(float x = bbox.p1.x - cell_width; x < bbox.p2.x + cell_width; x += cell_width) {
int gridx = int(x / cell_width);
int gridy = int(y / cell_height);
if(gridx < 0 || gridy < 0
|| gridx >= int(cells_x) || gridy >= int(cells_y)) {