Hi everyone! Long time lurker, first time posting. I have been using Zemax for the past couple of months, and have been getting familiar with the backend, C# ZOS-API. As I’ve been getting more familiar with the ZOS-API, I’ve tried to more and more exciting things, which eventually lead me to use the batch ray tracing function. I can do this successfully and actually get quite a good representation of my input picture at the output image side, using CreateDirectUnpol and AddRays. However, I am trying to get a feel for intensity on the imaging plane, and the only output I get when using ReadNextResult is intensity = 1, even though my system has various elements with different non-100% coatings on them. However, I am using black-box lenses from Thorlabs, and I’m wondering if this causes Zemax not to give out the intensity values? If not, what could I be doing wrong?

Attached is the relevant code I use which gives me 1 for intensity output:

                // Set up Batch Ray Trace
                ZOSAPI.Tools.RayTrace.IBatchRayTrace raytrace = TheSystem.Tools.OpenBatchRayTrace();
                int nsur = TheSystem.LDE.NumberOfSurfaces;
                var dir_x = linspace(-.1f, .1f, 10);
                var dir_y = linspace(-.1f, .1f, 10);
                int max_rays = n * n * dir_x.Length * dir_y.Length;
                //count up all positions and  angles to lauch from
                var c = 0;
                for (int i = 0; i < xl.Length; i++)
                {
                    for (int j = 0; j < yl.Length; j++)
                    {
                        if (listPixelsMask[i][j] > 0)
                        {
                            //then we have surface to launch from so proceed
                            for (int dx = 0; dx < dir_x.Length; dx++)
                            {
                                for (int dy = 0; dy < dir_y.Length; dy++)
                                {
                                    c++;
                                }
                            }
                        }
                    }
                }
                Console.WriteLine("# of rays simulated in batch trace: " + c);

                var directUnPolData = raytrace.CreateDirectUnpol(c, ZOSAPI.Tools.RayTrace.RaysType.Real, 0, nsur-1);

                List<double[]> inputParameters = new List<double[]>();

                for (int i = 0; i < xl.Length; i++)
                {
                    for(int j = 0;j < yl.Length; j++)
                    {
                        if (listPixelsMask[i][j] > 0)
                        {
                            //then we have surface to launch from so proceed
                            for (int dx = 0; dx < dir_x.Length; dx++)
                            {
                                for (int dy = 0; dy < dir_y.Length; dy++)
                                {
                                    //does ray hit lens, if not then dont consider it 
                                    var x = xl[i];
                                    var y = yl[j];
                                    //we have an angle relative to the vertical position
                                    var vector_direction = new double[] { dir_x[dx], dir_y[dy] , 1 };
                                    vector_direction = vector_direction.Select(item => item*item).ToArray();
                                    var vector_sum = vector_direction.Sum();
                                    vector_direction = vector_direction.Select(item=>item / vector_sum).ToArray();
                                    //collect input data
                                    inputParameters.Add(new double[] { xl[i], yl[j], 0, vector_direction[0], vector_direction[1], vector_direction[2] });
                                    //add to batch ray trace 
                                    directUnPolData.AddRay(0, xl[i], yl[j], 0, vector_direction[0], vector_direction[1], vector_direction[2]);
                                }
                            }
                        }
                    }
                }
                //save input parameters to file 
                var inputFile = @"C:\\Users\\AlexanderDumont\\OneDrive - Cytoveris Inc\\Documents\\R&D\\Reference Checks Analysis\\input.txt";
                using (var writer = new StreamWriter(inputFile))
                {
                    foreach(var item in inputParameters)
                    {
                        foreach(var col in item)
                        {
                            writer.Write(col + ",");
                        }
                        writer.WriteLine();
                    }
                }
                raytrace.RunAndWaitForCompletion();
                // Read batch raytrace and save results
                directUnPolData.StartReadingResults();
                int rayNumber, ErrorCode, vignetteCode;
                double double_X, double_Y, double_Z, double_L, double_M, double_N, double_L2, double_M2, double_N2, OPD, Intensity;
                bool success;

                success = directUnPolData.ReadNextResult(out rayNumber, out ErrorCode, out vignetteCode, out double_X, out double_Y, out double_Z, out double_L, out double_M, out double_N, out double_L2, out double_M2, out double_N2, out Intensity);
                ///save output to file as well 
                List<double[]> outputParameters = new List<double[]>();
                outputParameters.Add(new double[] {rayNumber, double_X,double_Y,double_Z,double_L,double_M,double_N, Intensity });
                while (success)
                {
                    success = directUnPolData.ReadNextResult(out rayNumber, out ErrorCode, out vignetteCode, out double_X, out double_Y, out double_Z, out double_L, out double_M, out double_N, out double_L2, out double_M2, out double_N2, out Intensity);
                    outputParameters.Add(new double[] { rayNumber, double_X, double_Y, double_Z, double_L, double_M, double_N, Intensity });
                }
                var outputFile = @"C:\\Users\\AlexanderDumont\\OneDrive - Cytoveris Inc\\Documents\\R&D\\Reference Checks Analysis\\output_" + z + ".txt";
                using (var writer = new StreamWriter(outputFile))
                {
                    foreach (var item in outputParameters)
                    {
                        foreach (var col in item)
                        {
                            writer.Write(col + ",");
                        }
                        writer.WriteLine();
                    }
                }