AttachShape performance issues

[sudsy]

Hi There,

I am working on a scientific modelling project that involves modelling a surface with 5e8 pyramid structures at various heights and positions along a surface.

I am running some proof of concept tests on my macbook with a Radeon Pro 560 in it. I have found that the performance of adding triangles degrades significantly as the number of triangles increases. Perhaps this is something I am doing wrong, if so, your help would be appreciated.

Here are the stats I generated for my triangle test.

Triangles	Time (sec)	Triangles / sec
1000	0.144	6944.44444444445
2000	0.17097	11697.9587062058
4000	0.2734	14630.5779078274
8000	0.549968	14546.3008756873
16000	1.70	9411.76470588235
32000	5.35	5981.30841121495
64000	20.66	3097.77347531462
128000	77.76	1646.09053497942

And here is the code I used to perform the tests:

Shape* mesh = api->CreateMesh(g_vertices, 3, 3 * sizeof(float), g_indices, 0, g_numfaceverts, 1);
    assert(mesh != nullptr);

    // api->AttachShape(mesh);
    int shapeCount = 128000;

    Shape* shapes[shapeCount];

    for(int i= 0; i < shapeCount; i++){
        // matrix m = translation(float3(0, i, 0));
        // matrix minv = inverse(m);
        shapes[i] = api->CreateInstance(mesh);
        // shapes[i]->SetTransform(m, minv);
        api->AttachShape(shapes[i]);   
    }

    //commit scene changes
    api->Commit();