In the Camera Node, View Tab,the first parameter Projection has a option:Custom Projection Matrix.

What is meanning? And how to use the Matrix data?

I find some information in wiki,but can’t understand.

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Projection /projection - A pop-up menu lets you choose from Perspective and Orthographic projection types. A third option Perpective to Ortho Blend enables the Projection Blend parameter below which can be used to blend between perspectives. A new 4th option Custom Projection Matrix allows you to specify a custom 4x4 projection matrix using a CHOP or a DAT.

Matrix CHOP/DAT /projmatrixop - When Custom Projection Matrix is selected, this parameters should be filled in with either a CHOP or a DAT with a custom 4x4 projection matrix. If a CHOP is used the first sample of the first 16 channels of the CHOP are used to create a 4x4 matrix. The channels can be thought as being read row-by-row or column-by-column. If a DAT is given a 4x4 table should be used. The matrix convention used is column major, which means vectors/points are multiplied on the right of the matrix.