dnac::UVBarycentricMapping Class Reference

#include <UVBarycentricMapping.h>

Collaboration diagram for dnac::UVBarycentricMapping:

Public Types
using	TrianglePositionIndicesPair = std::pair< Triangle, std::array< std::uint32_t, 3u > >
using	BarycentricPositionIndicesPair = std::pair< fvec3, ConstArrayView< std::uint32_t > >

Public Member Functions
	UVBarycentricMapping (const std::function< ConstArrayView< std::uint32_t >(std::uint32_t)> &faceGetter, ConstArrayView< std::uint32_t > vertexPositionIndices, ConstArrayView< std::uint32_t > textureCoordinateUVIndices, ConstArrayView< float > Us, ConstArrayView< float > Vs, std::uint32_t faceCount, MemoryResource *memRes)
	UVBarycentricMapping (const dna::Reader *reader, std::uint16_t meshIndex, MemoryResource *memRes)
ConstArrayView< TrianglePositionIndicesPair >	getTriangles () const
ConstArrayView< BoundingBox >	getBoundingBoxes () const
BarycentricPositionIndicesPair	getBarycentric (const fvec2 &uv) const

Private Attributes
Vector< TrianglePositionIndicesPair >	triangles
Vector< BoundingBox >	bBoxes

Member Typedef Documentation

BarycentricPositionIndicesPair

using dnac::UVBarycentricMapping::BarycentricPositionIndicesPair = std::pair<fvec3, ConstArrayView<std::uint32_t> >

TrianglePositionIndicesPair

using dnac::UVBarycentricMapping::TrianglePositionIndicesPair = std::pair<Triangle, std::array<std::uint32_t, 3u> >

Constructor & Destructor Documentation

UVBarycentricMapping() [1/2]

dnac::UVBarycentricMapping::UVBarycentricMapping	(	const std::function< ConstArrayView< std::uint32_t >(std::uint32_t)> &	faceGetter,
		ConstArrayView< std::uint32_t >	vertexPositionIndices,
		ConstArrayView< std::uint32_t >	textureCoordinateUVIndices,
		ConstArrayView< float >	Us,
		ConstArrayView< float >	Vs,
		std::uint32_t	faceCount,
		MemoryResource *	memRes
	)

                                                                   :
    triangles{memRes},
    bBoxes{memRes} {
 
    auto estimatedTriangleCount = static_cast<std::size_t>(static_cast<float>(faceCount) * 2.5f);
    triangles.reserve(estimatedTriangleCount);
    bBoxes.reserve(estimatedTriangleCount);
    for (std::uint32_t i = 0u; i < faceCount; i++) {
        auto face = faceGetter(i);
        while (face.size() > 2) {
            const auto vertexLayoutIndex0 = face[0];
            const auto vertexLayoutIndex1 = face[1];
            const auto vertexLayoutIndex2 = face[face.size() - 1u];
 
            const std::array<std::uint32_t, 3> positionIndices {vertexPositionIndices[vertexLayoutIndex0],
                                                                vertexPositionIndices[vertexLayoutIndex1],
                                                                vertexPositionIndices[vertexLayoutIndex2]};
 
            const auto uvIndex0 = textureCoordinateUVIndices[vertexLayoutIndex0];
            const auto uvIndex1 = textureCoordinateUVIndices[vertexLayoutIndex1];
            const auto uvIndex2 = textureCoordinateUVIndices[vertexLayoutIndex2];
 
            const std::array<fvec2, 3> UVs = {fvec2{Us[uvIndex0], Vs[uvIndex0]},
                                              fvec2{Us[uvIndex1], Vs[uvIndex1]},
                                              fvec2{Us[uvIndex2], Vs[uvIndex2]}};
 
            triangles.emplace_back(Triangle{UVs}, positionIndices);
            bBoxes.emplace_back(BoundingBox{UVs});
            face = face.last(face.size() - 1u);
        }
    }
    triangles.shrink_to_fit();
    bBoxes.shrink_to_fit();
}

References bBoxes, and triangles.

UVBarycentricMapping() [2/2]

dnac::UVBarycentricMapping::UVBarycentricMapping ( const dna::Reader *  reader, std::uint16_t  meshIndex, MemoryResource *  memRes  )

explicit

                                                                                                                 :
    UVBarycentricMapping(std::bind(&dna::Reader::getFaceVertexLayoutIndices, reader, meshIndex, std::placeholders::_1),
                         reader->getVertexLayoutPositionIndices(meshIndex),
                         reader->getVertexLayoutTextureCoordinateIndices(meshIndex),
                         reader->getVertexTextureCoordinateUs(meshIndex),
                         reader->getVertexTextureCoordinateVs(meshIndex),
                         reader->getFaceCount(meshIndex),
                         memRes) {
 
}

Member Function Documentation

getBarycentric()

UVBarycentricMapping::BarycentricPositionIndicesPair dnac::UVBarycentricMapping::getBarycentric

(

const fvec2 &

uv

)

const

                                                                                                             {
    BarycentricPositionIndicesPair barycentricPositionsPair;
    for (std::uint32_t i = 0u; i < bBoxes.size(); i++) {
        if (bBoxes[i].contains(uv)) {
            const auto barycentricWeights = triangles[i].first.getBarycentricCoords(uv);
            // If we don't hit any triangle, we will use one whose bounding box we hit
            barycentricPositionsPair = {barycentricWeights, ConstArrayView<std::uint32_t>{triangles[i].second}};
            if ((barycentricWeights[0] >= 0.0f) && (barycentricWeights[0] <= 1.0f) &&
                (barycentricWeights[1] >= 0.0f) && (barycentricWeights[1] <= 1.0f) &&
                (barycentricWeights[2] >= 0.0f) && (barycentricWeights[2] <= 1.0f)) {
                return barycentricPositionsPair;
            }
        }
    }
    return barycentricPositionsPair;
}

References bBoxes, dnac::contains(), and triangles.

getBoundingBoxes()

ConstArrayView< BoundingBox > dnac::UVBarycentricMapping::getBoundingBoxes

(

)

const

                                                                         {
    return {bBoxes.data(), bBoxes.size()};
}

References bBoxes.

getTriangles()

ConstArrayView< UVBarycentricMapping::TrianglePositionIndicesPair > dnac::UVBarycentricMapping::getTriangles

(

)

const

                                                                                                         {
    return {triangles.data(), triangles.size()};
}

References triangles.

Member Data Documentation

bBoxes

Vector<BoundingBox> dnac::UVBarycentricMapping::bBoxes

private

Referenced by getBarycentric(), getBoundingBoxes(), and UVBarycentricMapping().

triangles

Vector<TrianglePositionIndicesPair> dnac::UVBarycentricMapping::triangles

private

Referenced by getBarycentric(), getTriangles(), and UVBarycentricMapping().

---

The documentation for this class was generated from the following files:

• UVBarycentricMapping.h
• UVBarycentricMapping.cpp