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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #!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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