CODEWITHSUNDEEP
c++vcg
BQ_
BQ_

Reputation: 60

Issue with Wedge Texture Coordinates in VCG Mesh Library when Importing OBJ File

I am attempting to read an OBJ file with texture coordinates using the VCG library in C++. Here's the code snippet I am working with:

std::string DelaudeyMeshWithTexture =
                "E:/Learn_MeshLab/meshlab/build/data/DelauneyWithTexture.obj";
CMeshO delaunayMesh;
int mask = vcg::tri::io::Mask::IOM_VERTTEXCOORD | vcg::tri::io::Mask::IOM_WEDGTEXCOORD;

int result = vcg::tri::io::ImporterOBJ<CMeshO>::Open(delaunayMesh, DelaudeyMeshWithTexture.c_str(), mask);

delaunayMesh.face.EnableWedgeTexCoord();

if (!(mask & vcg::tri::io::Mask::IOM_WEDGTEXCOORD)) {
    std::cerr << "Warning: Delaunay mesh does not have wedge texture coordinates." << std::endl;
}

for (const auto& face : delaunayMesh.face) {
    if (!face.IsD()) {
        for (int j = 0; j < 3; ++j) {
            const auto& texCoord = face.WT(j);
            qDebug() << texCoord.U() << "," << texCoord.V();
        }
    }
}

However, when I run the code, I keep getting this warning:

Warning: Delaunay mesh does not have wedge texture coordinates.

And the output is always:

0.5 , 0.5
0.5 , 0.5
0.5 , 0.5
...ALL 0.5

I also tried setting the mask to 0, but that didn't work either.

Why is VCG not reading the wedge texture coordinates correctly, and how can I fix this?

Upvotes: -2

Views: 72

Answers (1)

BQ_
BQ_

Reputation: 60

I just solved this issue. I found that after adding this line, delaunayMesh.face.EnableWedgeTexCoord();, and modifying the output format for the face texture coordinates as follows:

for (auto& face : delaunayMesh.face) {
    for (int i = 0; i < 3; i++) {
        // Get the texture coordinates of the current vertex
        Point2f texCoord = face.WT(i).P();

        qDebug()
            << "Vertex texture coordinates: " << texCoord.X() << ", " << texCoord.Y();
    }
}

my coordinates started loading correctly. I still don’t fully understand the difference between face.WT(i).P() and my original definition, but at least the issue is now resolved.

Upvotes: 1

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