Matt nous apporta ses lumieres en ce 2005-06-20 17:57:
> Hi. I would like to use a ray tracing engine to compute the blockage of an
> antenna aperture as I rotate the aperture in azimuth and elevation. I was
> curious if POV-ray would be a good tool for this application. Details of my
> problem are as follows:
> 
> I would like to compute the percent of blockage for a circular antenna
> aperture located on an airplane. My approach is to launch evenly spaced
> rays from the aperture and monitor each ray to determine if it intersects a
> surface or escapes to the problem boundary. I am not interested in any type
> of multipath (simply blocked or not blocked). I compute the percent
> blockage by dividing the total number of rays that intersect a surface by
> the total number of rays launched. I need to rotate the aperture in azimuth
> and elevation and repeat the process. Additionally, I would like to write
> the blockage information to an output file.
> 
> I have worked with ray tracing engines before and I know that I can solve
> this sort of problem with ray tracing. The problem is that I do not have
> access to the engines I worked with in the past. So, I am curious if
> POV-ray can solve my problem. I quickly looked through the pov-ray
> documentation and it appears that some of the capabilities I need are
> present. Before I spend time investigating the capabilities (which I think
> is going to take a bit of time) I was curious if anyone could provide me
> with a quick answer.
> 
> Thank you in advance for any information.
> 
> 
You can put a light_source at the position of the antena. Then, you can use a sphere,
or watever 
shape you want, with a hole punched in it by using clipped_by. Use a box with the
inverse keyword. 
Then, you need some surface to catch the light. The parts that are lighted are free,
the parts in 
shadow are blocked.
You can orient the aperture with a rotate<x,y,z> command. If the aperture is along the
z axis, you 
only need x and y rotation.

Alain

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