Содержание

DirectXMesh

Generates the adjacency and/or point representatives for a mesh.

HRESULT GenerateAdjacencyAndPointReps(
   const uint16_t* indices, size_t nFaces,
   const XMFLOAT3* positions, size_t nVerts,
   float epsilon,
   uint32_t* pointRep, uint32_t* adjacency );

HRESULT GenerateAdjacencyAndPointReps(
   const uint32_t* indices, size_t nFaces,
   const XMFLOAT3* positions, size_t nVerts,
   float epsilon,
   uint32_t* pointRep, uint32_t* adjacency );

Parameters

epsilon: Threshold used when comparing positions for shared/duplicate positions for geometric adjacency. This value can be 0 for bit-wise identical vertex positions, which results in topological adjacency.

If pointRep is nullptr, it is still generated as part of the computation but is not returned to the caller.

If both pointRep and adjacency are nullptr, these functions return an error code.

Remarks

These functions assume the triangular mesh description is valid. See Validate

Example

This computes a topological adjacency:

auto mesh = std::make_unique<WaveFrontReader<uint16_t>>();

if ( FAILED( mesh->Load( L"test.obj" ) ) )
   // Error

size_t nFaces = mesh->indices.size() / 3;
size_t nVerts = mesh->vertices.size();

auto pos = std::make_unique<XMFLOAT3[]>(nVerts);
for( size_t j = 0; j < nVerts; ++j )
   pos[ j ] = mesh->vertices[ j ].position;

auto adj = std::make_unique<uint32_t[]>(mesh->indices.size());
if ( FAILED ( GenerateAdjacencyAndPointReps(
   mesh->indices.data(), nFaces,
   pos.get(), nVerts, 0.f, nullptr, adj.get() ) ) )
   // Error

Changing the last statement to use a non-zero epsilon returns a geometric adjacency:

if ( FAILED ( GenerateAdjacencyAndPointReps(
   mesh->indices.data(), nFaces,
   pos.get(), nVerts, 1e-5f, nullptr, adj.get() ) ) )
   // Error

For Use

Universal Windows Platform apps
Windows desktop apps
Windows 11
Windows 10
Windows 8.1
Windows 7 Service Pack 1
Xbox One
Xbox Series X|S
Windows Subsystem for Linux

Architecture

x86
x64
ARM64

For Development

Visual Studio 2022
Visual Studio 2019 (16.11)
clang/LLVM v12 - v18
GCC 10.5, 11.4, 12.3
MinGW 12.2, 13.2
CMake 3.20

DirectX Tool Kit for DirectX 11

DirectX Tool Kit for DirectX 12

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DirectXMath

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