#1 Trilinear Interpolation

[Susan Frank]

Trilinear Interpolation won't compile with RGBA as in the following
message:
...
vlipolator_trilinear.h: In member function `DataType
vlInterpolatorTriLinear<DataType,
Layout>::getValueAt(vlVolIterConst<DataType, Layout>&, const
vlPoint3f&, bool) [with DataType = vlColorRGBA<uint8>, short
unsigned int Layout = 10]':
../../../include/vlplugininfo.h:180: instantiated from here
vlipolator_trilinear.h:109: conversion from `vlTriple<uint8>' to
non-scalar type `vlColorRGBA<uint8>' requested

...