I am working with an example of loading SketchUp files using the SketchUp C API but I am having a hard time understanding how to load the indices from the associated model.

The below code works but from what I am getting it's just the vertex data.

I may be wrong but it is hard to understand from the example.

May someone review the code below and shed light on where/if the indices are being loaded from the example code below?

Thank you.
Code auto:0:
#include <slapi/slapi.h>
#include <slapi/geometry.h>
#include <slapi/initialize.h>
#include <slapi/unicodestring.h>
#include <slapi/model/model.h>
#include <slapi/model/entities.h>
#include <slapi/model/face.h>
#include <slapi/model/edge.h>
#include <slapi/model/vertex.h>
#include <vector>
int main() {
  // Always initialize the API before using it
  // Load the model from a file
  SUModelRef model = SU_INVALID;
  SUResult res = SUModelCreateFromFile(&model, "model.skp");
  // It's best to always check the return code from each SU function call.
  // Only showing this check once to keep this example short.
  if (res != SU_ERROR_NONE)
    return 1;
  // Get the entity container of the model.
  SUEntitiesRef entities = SU_INVALID;
  SUModelGetEntities(model, &entities);
  // Get all the faces from the entities object
  size_t faceCount = 0;
  SUEntitiesGetNumFaces(entities, &faceCount);
  if (faceCount > 0) {
    std::vector<SUFaceRef> faces(faceCount);
    SUEntitiesGetFaces(entities, faceCount, &faces[0], &faceCount);
    // Get all the edges in this face
    for (size_t i = 0; i < faceCount; i++) {
      size_t edgeCount = 0;
      SUFaceGetNumEdges(faces[i], &edgeCount);
      if (edgeCount > 0) {
        std::vector<SUEdgeRef> edges(edgeCount);
        SUFaceGetEdges(faces[i], edgeCount, &edges[0], &edgeCount);
        // Get the vertex positions for each edge
        for (size_t j = 0; j < edgeCount; j++) {
          SUVertexRef startVertex = SU_INVALID;
          SUVertexRef endVertex = SU_INVALID;
          SUEdgeGetStartVertex(edges[j], &startVertex);
          SUEdgeGetEndVertex(edges[j], &endVertex);
          SUPoint3D start;
          SUPoint3D end;
          SUVertexGetPosition(startVertex, &start);
          SUVertexGetPosition(endVertex, &end);
          // Now do something with the point data
  // Get model name
  SUStringRef name = SU_INVALID;
  SUModelGetName(model, &name);
  size_t name_length = 0;
  SUStringGetUTF8Length(name, &name_length);
  char* name_utf8 = new char[name_length + 1];
  SUStringGetUTF8(name, name_length + 1, name_utf8, &name_length);
  // Now we have the name in a form we can use
  delete []name_utf8;
  // Must release the model or there will be memory leaks
  // Always terminate the API when done using it
  return 0;