[vtkusers] Actor Disappeared

[Wenlong Wang]

Dear all,

I'm trying to do a gradient descent in my application. It was working well.
But as I tried to lower the threshold(which means more iterations are
happening), the application just stop rendering and give me a blank screen.
Most misterious is, there is no error happens. No memory leak, no access
vialation, no nothing. The program just jump out of the loop. I am really
confused by this.

Here is my code

while(abs(CurErr - PreErr) > threshold)
    {
        PreErr = CurErr;
        tPoints->Delete();

        for (int i = 0; i<sizeof(para)/sizeof(double); i++)
        {
            temp_para[i] = para[i];
        }

        for(int index = 0; index < sizeof(para)/sizeof(double); index++)
        {
            temp_para[index] = temp_para[index] + temp_para[index]*step;


            tCamera->DeepCopy(markCamera);
            tPoints = GenerateNewPoints(temp_para, count);

            double err = Dist_2DLandmarks(tPoints, tCamera);
            temp_para[index] = para[index];
            par_der[index] = (err - CurErr) / temp_para[index]*step;

        }

        for(int i = 0; i < sizeof(para)/sizeof(double); i++)
        {
            para[i] = para[i] - par_der[i] * step;
        }

        tPoints = GenerateNewPoints(para, count);

        tCamera->DeepCopy(markCamera);

        CurErr = Dist_2DLandmarks(tPoints, tCamera);
        count ++;
    }

Thank you very much for any suggestions.

Best regards
Long
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