How to open Tonatiuh output .DAT files in MATLAB?

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venu 2024-1-27

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编辑： venu 2024-2-1

Hi, I have output files from Tonatiuh ray-tracing software but I am unable to open this file in any other software. I was wondering if there is any way to open it in MATLAB so that I can perform the analysis that I need.

Any help would be appreciate in this regard. This is a binary output file with a .DAT extension. I am unable to uplaod the file here so I am attaching a One-Drive link if anybody wants to have a look.

https://drive.google.com/file/d/1e6J5ix29uK20r1WKoIg3zyze7Es1Ksfz/view?usp=sharing

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Image Analyst 2024-1-27

You have to know the format of the file. Do you know that? Otherwise it'll just be a big long string of bytes with no meaning behind them.

venu 2024-1-27

The format of the file is .dat

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Walter Roberson 2024-1-27

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According to https://code.google.com/archive/p/tonatiuh/

The binary format used to store the values is Real64 with big-endian byte ordering. The

first value stored in the file is the power per photon in watts (W). This real value

is then followed by seven-tuples of real values, one per photon . Every seven-tuple

holds the following values in the specific order given: * PhotonID * x-coordinate *

y-coordinate * z-coordinate * surface side ( 0 if is back side , 1 if is front side ) *

Previous PhotonID (0 if the photon is the first of a given ray) * Next PhotonID (0 is

the photon is the last of a given ray)

So you would fopen() the file with 'ieee-be' and you would fread() '*double* with size [7 inf] . The result would store tuples running down columns.

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Walter Roberson 2024-1-31

I do not use What's App at all.

venu 2024-2-1

编辑：venu 2024-2-1

Respected sir, I want to calculate optical Efficiency buy using photon mapping .dat for phd thessis your small help really create a lot of confidence in me. Can i send you google invite Link

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Benjamin Thompson 2024-1-27

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fid = fopen('yourfilename.dat', 'r');

A = fread(fid, 'uint8=>uint8');

fclose(fid);

Then the data is in A as bytes. If you know more about the file format you can change the arguments to fread in order to make the result in A easier to use.

doc fread