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API > API/Runtime > API/Runtime/GeometryCore > API/Runtime/GeometryCore/Spatial
References
| Module | GeometryCore |
| Header | /Engine/Source/Runtime/GeometryCore/Public/Spatial/MeshWindingNumberGrid.h |
| Include | #include "Spatial/MeshWindingNumberGrid.h" |
Syntax
template<class TriangleMeshType>
class TMeshWindingNumberGrid
Remarks
Sample mesh winding number (MWN) on a discrete grid. Can sample full grid, or compute MWN values along a specific iso-contour and then fill in rest of grid with correctly-signed values via fast sweeping (this is the default)
TODO:
- I think we are over-exploring the grid most of the time. eg along an x-ray that intersects the surface, we only need at most 2 cells, but we are computing at least 3, and possibly 5.
- it may be better to use something like bloomenthal polygonizer continuation? where we are keeping track of active edges instead of active cells?
Variables
| Type | Name | Description | |
|---|---|---|---|
 |
int | BufferCells | How many cells around border should we keep |
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bool | bWantMeshSDFGrid | In NarrowBand mode, we compute mesh SDF grid; if true then it can be accessed via SDFGrid function after Compute() |
 |
TFunction< bool()> | CancelF | If this function returns true, we should abort calculation |
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double | CellSize | Size of cubes in the grid |
 |
EComputeModes | ComputeMode | |
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TFastWindingTree< TriangleMeshType > * | FastWinding | |
 |
FVector3f | GridOrigin | Computed results |
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const TriangleMeshType * | Mesh | |
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TSweepingMeshSDF< TriangleMeshType > | MeshSDF | SDF grid we compute in narrow-band mode. |
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FDenseGrid3f | WindingGrid | |
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float | WindingIsoValue | In narrow-band mode, if mesh is not closed, we will explore space around this MWN iso-value |
Constructors
| Type | Name | Description | |
|---|---|---|---|
 |
TMeshWindingNumberGrid
(
const TriangleMeshType* Mesh, |
Functions
| Type | Name | Description | |
|---|---|---|---|
  |
constexpr const float & | At
(
int I, |
|
 |
FVector3f | CellCenter
(
int I, |
|
 |
void | Compute () |
|
  |
FVector3i | Dimensions () |
|
  |
float |
Enums
| Type | Name | Description | |
|---|---|---|---|
 |
EComputeModes | Should we compute MWN at all grid cells (expensive!!) or only in narrow band. |