Is there a cheap 3d camera for sale?

Question

3D

There was an idea to implement a project like this , but to create a more or less workable prototype, you need a 3d camera like a kinect, the prices of which, to put it mildly, go beyond the budget of the "experiment", the question is, is there a more or less cheap alternative?
ps the project is being done for charitable purposes and there is no sponsor for the purchase of more expensive components.

Answer 1

You can do everything through the webcam on OpenCV, but you have to tinker and the accuracy will be worse.

Answer 2

Asus xtion pro is a cheaper depth sensor. I'm just selling one, didn't come in handy for the robot.

Answer 3

The easiest option is a regular webcam + IR illumination for it. The light level will be roughly inversely proportional to the square of the distance.

Answer 4

And why is there a 3D camera at all, with the right light, everything turns out with a regular webcam, with recalibrations after the hands leave the frame.
The projector shines from above, the camera looks nearby, as soon as the hands leave the frame, we give a white field and stupidly understand the depth by brightness. Although you can give a grid or structured noise, graze areas where there were hands, but here the camera is already needed better. IMHO is simpler stupidly in terms of brightness, an ordinary webcam.