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# Inputs

O_DisparityGenerator has the following inputs:

Source | A stereo pair of images. If you intend to use the Alignment control, O_DisparityGenerator requires an O_Solver node as one of its inputs. Alignment defaults to 0, but increasing it forces the disparity map to match the camera geometry to remove noise on the vertical component of disparity.
Mask | An optional mask that specifies areas to exclude from the disparity calculation. You can use this input to prevent distortions at occlusions or to calculate disparity for a background layer by ignoring foreground elements. Note that masks should exist in both views, and O_DisparityGenerator treats the alpha values of 1 as foreground and blurs to the 0 value using nearby disparity to recreate object boundaries, rather than image data. When you create a mask using Roto or RotoPaint, you can use the feather control to extend the calculation. For example, the disparity map may have a sharper transition at depth edges with a binary mask, but applying feather on the mask can help smooth the resulting image.
The left view. | A mask to select the dancers in the left view.

To see a table listing the nodes or channels each Ocula node requires in its inputs, see Node Dependencies.