Function writeOFF

tutorials/PlanarSectioning/PlanarSectioning.cpp:324–363

write mesh to .off file

// write mesh to .off file
void writeOFF(
    const char* fpath,
    McFloat* pVertices,
    McUint32* pFaceIndices,
    McUint32* pFaceSizes,
    McUint32 numVertices,
    McUint32 numFaces)
{
    fprintf(stdout, "write: %s\n", fpath);

    FILE* file = fopen(fpath, "w");

    if (file == NULL) {
        fprintf(stderr, "error: failed to open `%s`", fpath);
        exit(1);
    }

    fprintf(file, "OFF\n");
    fprintf(file, "%d %d %d\n", numVertices, numFaces, 0 /*numEdges*/);
    int i;
    for (i = 0; i < (int)numVertices; ++i) {
        McFloat* vptr = pVertices + (i * 3);
        fprintf(file, "%f %f %f\n", vptr[0], vptr[1], vptr[2]);
    }

    int faceBaseOffset = 0;
    for (i = 0; i < (int)numFaces; ++i) {
        McUint32 faceVertexCount = pFaceSizes[i];
        fprintf(file, "%d", (int)faceVertexCount);
        int j;
        for (j = 0; j < (int)faceVertexCount; ++j) {
            McUint32* fptr = pFaceIndices + faceBaseOffset + j;
            fprintf(file, " %d", *fptr);
        }
        fprintf(file, "\n");
        faceBaseOffset += faceVertexCount;
    }

    fclose(file);
}