Hello Tuğçe,
Did you assigned memory to the resource? rt_init_resource() expects a
pointer to valid memory.
In general, it isn't easy to write a Python wrapper for BRL-CAD. I
recommend to program it in C first. If this works, you can try to move your
implementation to Python. Or, you could write a small wrapper/adapter in C,
which exposes exactly the functionality you need with a simple,
ctypes-friendly API.
Regards,
Daniel
Am Fr., 17. Dez. 2021 um 15:17 Uhr schrieb Tuğçe Sena Koyuncu <
tugcesena2...@gmail.com>:
> Hi
> We are working on a project to use ray tracing functionality of BRL CAD
> with python. How can we achieve this? By using the ctypes module, we
> loaded a dll library of BRL CAD and in particular used librt.c. By ctypes,
> we wrapped the functions rt_dirbuilt(), rt_gettree(), rt_prep and finally
> rt_shootray(). We implemented all needed structs and unions, including
> application and partition structures. Application structure is initialized
> with 0s as documentation stated. For hit and miss routines, we define
> python functions and wrap them by using CFUNCTYPES to pass as valid C
> arguments. Arguments of hit and miss functions are defined according to
> documentation, too. However, when rt_shootray is called, the program
> crashes and gives the following errors. "Corrupt application struct" error
> raised in run mode and "OSError: exception: access violation writing
> 0x000002B220192BE8" error raised in debug mode in PyCharm. "corrupt
> application struct" error raised when the attributes of application
> struct which are a_zero1 and a_zero2 are not 0 but both of them seem to be
> zero in our code. What can cause this and how can we solve this? We also
> use the function rt_init_resource since it gives another error when it's
> not added even though the source code call this functions just in the
> script.
>
> Thanks in advance.
> [image: image.png]
>
> [image: image.png]
> error from debugger mode
> [image: image.png]
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