[Bf-cycles] Rendering with Radio waves

[Lukas Stockner]

If you need wave effects, I'd take a look at FDTD methods.
They compute the electric and magnetic fields iteratively, one timestep after the other, and are exact, not a Monte-Carlo-Estimate.
Since they work directly with the Maxwell equations, things like polarisation, diffraction and interference are handled implicitly.
Indeed, FDTD is also used for audio rendering, just with scalar fields instead of vector fields.

Am 09.04.2014 11:39 schrieb Trevor Anderson <trevor.g.anderson at gmail.com>:
>
> Thanks heaps everyone, I'll have a look into Lux and pbrt. 
> Audio rendering is an interesting idea. Definitely something worth considering. 
>
> I was hoping that at least initially I could limit myself to considering large/smooth enough targets that the optical assumptions of light would be sufficient. 
> I plan on taking some test images with a mmW radar system to compare to, so I will pay close attention to the interference patterns and may need to take another approach, thanks for the input.
>
> Cheers,
> Trev.
>
>
>
> On Wed, Apr 9, 2014 at 6:56 PM, Ton Roosendaal <ton at blender.org> wrote:
>>
>> Hi,
>>
>> For physical accurate wavelength mechanics (millimeter waves interference and interaction with matter) you  might have to build a complete independent system - I'm afraid neither cycles or lux would help much here. You probably could investigate audio rendering (auralization).
>>
>> Light is in the nanometres spectrum, which allows a lot of assumptions and models to simulate an environment where light goes around and how to render it. These assumptions I wouldn't make for mm waves.
>>
>> -Ton-
>>
>> --------------------------------------------------------
>> Ton Roosendaal  -  ton at blender.org   -   www.blender.org
>> Chairman Blender Foundation - Producer Blender Institute
>> Entrepotdok 57A  -  1018AD Amsterdam  -  The Netherlands
>>
>>
>>
>> On 9 Apr, 2014, at 8:34, Michael Fox wrote:
>>
>> > I would recommend looking into Luxrender as it has full spectral rendering, and is free and opensource and have very nice blender intergration, i would ask the luxrender people to help you, they are very helpful
>> >
>> > On 09/04/14 16:24, Trevor Anderson wrote:
>> >> Thanks Lukas.
>> >>
>> >> I will take a more serious look at that then. :)
>> >>
>> >> Regards,
>> >> Trev.
>> >>
>> >>
>> >> On Wed, Apr 9, 2014 at 2:41 PM, Lukas Stockner <lukas.stockner at freenet.de> wrote:
>> >> Hi,
>> >> for a project like this, I wouldn't go for Cycles since it has no spectral rendering support and a quite complicated integrator code.
>> >> My choice would be PBRT, since it has spectral support, clean and simple code and great documentation in form of a book :)
>> >>
>> >> Lukas Stockner
>> >>
>> >> Am 09.04.2014 01:38 schrieb Trevor Anderson <trevor.g.anderson at gmail.com>:
>> >> >
>> >> > Hi all,
>> >> >
>> >> > I am fairly new to blender and to development for that matter. So if anyone can point me in the right direction that would be much appreciated. Specifically if there is perhaps another open source ray-tracing tool that might be better for what I am looking to do.
>> >> >
>> >> > I am looking to use cycles to simulate millimetre wavelength radio wave imaging. As part of that I suppose I would be looking at trying to track polarization of the rays, but primarily changing the wavelengths captured by the camera. Ideally also exporting range information too.
>> >> >
>> >> > I was wondering if any of this had been done already, even for something like infra-red or hyper-spectral imaging, something that would give me a starting point.
>> >> >
>> >> > Thanks,
>> >> > Trev.
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>> >>
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