stencil

float CELL::stencil[9]   Poisson stencil coefficients. winding order of the stencil coefficients: | 0 | 1 | ____|____|____|_____ | | 7 | | 2 ____| 8 |_____ | | 6 | | 3 ____|_________|_____ | | | | 5 | 4 | Stencils 0,2,4,6 should always exist. Depending on if the neighbor is on a lower refinement level, stencils 1,3,5,7 may or may not exist. If they are not present, the pointer value should ne NULL.

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