Let gravprisms handle interfaces #6829
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An interface grid is a surface that may cross zero. If so, the prisms we create should change sign across the zero threshold and for negative z we create a prism from x to 0 and for positive z we go from 0 to z. If a second surface or constant is given then we have a layer and no density changes sign. Documentation has ben updated to explain this as well adn a few comments were added elsewhere. I also added a test on the density contrast (-D cannot be 0, but variable density from grid could be zero at times and then we skip making a dummy prism).
PaulWessel
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documentation
joa-quim
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Jun 28, 2022
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An interface grid is a surface that may cross zero. If it does, the prisms we create should change sign across the zero threshold and for negative z we create a prism from x to 0 and for positive z we go from 0 to z. If a second surface or constant is given then we have a layer and no density changes sign. Documentation has been updated to explain this as well and a few comments were added elsewhere. I also added a test on the density contrast (-D cannot be 0, but variable densities from a grid could be zero at times and then we skip making a dummy prism).