topic How does Fusion 360 calculate volumes of solids? in Fusion Support Forum

How does Fusion 360 calculate volumes of solids?

395390 — Wed, 21 Dec 2022 19:41:26 GMT

Hi, I am working on a math exploration relating to Fusion 360 and need to know how the program calculates volumes of solids (shown with the properties tool) and its degree of accuracy. I'd assume that it always uses the same methodology of breaking into tiny parts to give a precise estimation but am not sure, I can't seem to find it anywhere online. I tried to contact Fusion support to ask but apparently I don't have access to support??? Any help would be much appreciated, thanks!

Re: How does Fusion 360 calculate volumes of solids?

serkanleblebiciVYZ4G — Wed, 21 Dec 2022 20:01:14 GMT

Re: How does Fusion 360 calculate volumes of solids?

395390 — Wed, 21 Dec 2022 20:09:41 GMT

appreciate it but I know how to find its calculated volume, I'm looking for HOW it calculates it and how accurate/precise it is

Re: How does Fusion 360 calculate volumes of solids?

serkanleblebiciVYZ4G — Wed, 21 Dec 2022 20:22:54 GMT

As Far As I understand, you want to be sure the volume calculation. you can check a basic model. Or you can use the different model. I check as the below. 100mmx100mmx100mm as a cube=It is 1.000.000 mm3. In addition we use the properties from feature tree.

Re: How does Fusion 360 calculate volumes of solids?

395390 — Wed, 21 Dec 2022 20:36:58 GMT

yes, but I am mainly concerned with how fusion calculates this volume, as it would be helpful to have something to explain and cite. I'm also wondering how precise it is when the shape is much more complex. Take this regular pentagon extruded over an approximation of a quartic function I've attached. My math gives me an extremely close volume, and im not sure what amount of error can be attributed to Fusion's volume estimation, rounding in Fusion, or some methodological error on my end.

Re: How does Fusion 360 calculate volumes of solids?

TrippyLighting — Wed, 21 Dec 2022 20:43:53 GMT

I don't think the exact algorithms are in the public domain.

We' discussed the results (not the implementation) of volume/mass calculations using different CAD software packages a few years back in this thread.

Re: How does Fusion 360 calculate volumes of solids?

395390 — Wed, 21 Dec 2022 21:15:33 GMT

thanks! seems like i’ll just go with that, unable to access exactly how the program does it and assume there’s just an extremely minor degree of error