Getting Face UVBounds about opencascade.js HOT 4 CLOSED

Hi,

this is one of the limitations coming from the differences of how JavaScript and C++ work. The C++ function BRepTools::UVBounds takes in references to Standard_Real, which translates to a Number type in JavaScript. JavaScript does not support passing arguments as reference (only as shallow copy). I think this limitation only applies to built-in datatypes like float, double (or Standard_Real), int, char, etc.

In my understanding, there is currently no way to achieve this without modifying the OpenCascade API (with some Getter functions) and recompiling the library against this change. A change can be applied as a patch, so that there is a chance that it won't break with new releases of OpenCascade. There are already some similar patches in the 1.1.1 version of OpenCascade.js, like this one.

I will open an issue in the Emscripten repository and ask if someone has a better workaround for this issue. If not, I will create the patch, which will then become part of the upcoming 2.0 release.

from opencascade.js.

Thank you for the explanation and for looking into it! There's no urgency, and it's super nice that it will be addressed in 2.0. Also nice to know that there are ways to patch these things, I hope Emscripten team will have some ideas as well ;)

Your answer definitely saves me from banging against the wall. I suspected that there's something different about this one. Otherwise opencascade.js works amazing so far... Have to integrate few more basic features and will ship first experimental release.

from opencascade.js.

Very happy to hear that 🙂!
It would be great if you would share your results and issues, if you find more.

from opencascade.js.

Have a look at this post with an example on how to achieve this using a custom build.
As for the general solution to the problem of passing references to built-in datatypes: That will come eventually, but it might take a while.

from opencascade.js.