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Using reprojectimageto3d function I calculate the actual coordinate points [X, Y, Z], however, according to the documentation, the results obtained are divided by W. Please answer what the variable W is and how can I calculate it

Using reprojectimageto3d function I calculate the actual coordinate points [X, Y, Z], however, according to the documentation, the results obtained are divided by W. Please answer what the variable W is and how can I calculate itit?