# Is there any difference between calculating 3d points from a depth map, vs triangulating?

As above. I have a depth map from a pre-calibrated stereo camera.

I am getting 3d points using:

```
int y = kpts[kp].pt.y;
int x = kpts[kp].pt.x;
cv::Vec3d tmpPoint;
sl::float1 dist;
depth_image_zed.getValue(x, y, &dist);
if (isValidMeasure(dist) && dist != 0) {
tmpPoint(0) = x;
tmpPoint(1) = y;
tmpPoint(2) = dist * 10;
//get actual coordinates
float cx = zed.getCameraInformation().calibration_parameters.left_cam.cx;
float cy = zed.getCameraInformation().calibration_parameters.left_cam.cy;
float fx = zed.getCameraInformation().calibration_parameters.left_cam.fx;
float fy = zed.getCameraInformation().calibration_parameters.left_cam.fy;
cv::Vec3d tmpVec;
double x3D = ((tmpPoint(0) - cx) * tmpPoint(2)) / fx;
double y3D = ((tmpPoint(1) - cy) * tmpPoint(2)) / fy;
pcl::PointXYZ pnt;
pnt.x = x3D;
pnt.y = y3D;
pnt.z = tmpPoint(2);
```

My question is, if I was to match these same points, and triangulate them using opencv, with the same calibration, would i get the exact same points? Is there any difference is using a stereo depth map, vs stereo triangulation, for 3d point positions?

thanks!