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API > API/Runtime > API/Runtime/Chaos > API/Runtime/Chaos/FLevelSet
Description
Estimate the volume bounded by the zero'th isocontour of the level set. #BGTODO - We can generate a more accurate pre-calculated volume during generation as this method still under estimates the actual volume of the surface.
| Name | ApproximateNegativeMaterial |
| Type | function |
| Header File | /Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Levelset.h |
| Include Path | #include "Chaos/Levelset.h" |
FReal ApproximateNegativeMaterial() const