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Reference.org
Trilinear interpolation
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<p>Trilinear interpolation is a method of <a href="/facts/Multivariate_interpolation/qj0F4Jze">multivariate interpolation</a> on a <a href="/facts/Three_dimensional_space/KAqKWUbS">3-dimensional</a> <a href="/facts/Regular_grid/8vDdL4UB">regular grid</a>. It approximates the value of a function at an intermediate point ( x , y , z ) {\displaystyle (x,y,z)} within the local axial rectangular <a href="/facts/Prism_(geometry)/baIRRkCy">prism</a> linearly, using function data on the lattice points. Trilinear interpolation is frequently used in <a href="/facts/Numerical_analysis/QT9cYa9z">numerical analysis</a>, <a href="/facts/Data_analysis/CNtARxLW">data analysis</a>, and <a href="/facts/Computer_graphics/lapBE8wv">computer graphics</a>. </p>