#!F-adobe-helvetica-medium-r-normal--18* #!N #!N #!Rinval Invalid Positions and Invalid Connections Components #!N #!N #!N The "invalid positions" and "invalid connections" components allow positions or connections to be marked as not having valid data. This is useful, for example, for observational data defined on a regular grid but with occasional missing observations, or for simulation data defined on a regular grid but with a "hole" covered by another grid, perhaps at a higher resolution. The "invalid positions" component can be an Array of bytes or unsigned bytes, one for each position, where the component is dependent on positions (i.e., has a "dep" attribute of "positions."). In that case, the value 1 indicates that the corresponding position is invalid, and 0 that the corresponding position is valid. Alternatively, the "invalid positions" component can be an Array of signed or unsigned integers, where the component references the positions (i.e., has a "ref" attribute of "positions"). In that case, the component contains a list of the indices of the invalid positions. The first method is more space-conserving when there are a large number of invalid elements; the second, when there are a relatively small number. See #!Lcompute,dxall795 h Compute #!EL in IBM Visualization Data Explorer User's Reference for a way to convert from the "ref" type to the "dep" type. #!N #!N The "invalid connections," "invalid faces," and "invalid polylines" components can be defined in an analogous way. #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Ltall213,dxall213 h Tangents, Normals, and Binormals Components #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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