9aade6bd61
OpenVDB will throw an exception when trying to prune a SDF/Level-Set grid with a negative background value. The geometry nodes in this case are constructing a nominal SDF grid from a generic "density" volume cube. The negative background value results from processing the background value the same way as all other grid values in the new field+grid math feature (`blender::nodes::process_background`). Since any grid can be constructed with a negative background value we have to check and correct this before calling the OpenVDB prune function. Pull Request: https://projects.blender.org/blender/blender/pulls/146837
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