Help with SketchUp C Api Example; Index Data?


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;