pointsAtZ attribute represent the X location in the coordinate system established by attribute
primitiveUnits on the
<filter> element of the point at which the light source is pointing, assuming that, in the initial coordinate system, the positive Z-axis comes out towards the person viewing the content and assuming that one unit along the Z-axis equals one unit in X and Y.
If the attribute is not specified, then the effect is as if a value of 0 were specified.
The following elements can use the
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