vla radio telescope v2 progress

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selden
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vla radio telescope v2 progress

Post #1by selden » 23.01.2011, 14:18

Previously I posted the availability of an Addon containing a simplistic model of one of the VLA telescopes.
( See viewtopic.php?f=23&t=16247 )

Since then I've gradually been adding more details. Here is a picture showing some of the progress so far.

Note that I'm doing my usual "representational" modeling, not "realistic". The support structure is implemented using "cubes" -- each strut is composed of a single rectangular solid with only 8 vertices. The real structure's individual struts are actually 3 cylinders, which would increase the number of vertices by about a factor of 20. Currently the mirror assembly is about 16K vertices. I'm guessing that'll double by the time it's finished. The yoke is about 10K and the base is about 5K. They're essentially complete, so I don't expect them to increase significantly.

One of the pictures I'm using as a reference can be seen at
http://static.zooomr.com/images/495879_720aa556d8_b.jpg
Selden

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Re: vla radio telescope v2 progress

Post #2by Cham » 23.01.2011, 14:56

WOW Selden !

I can't wait to see the final version. Looks good ! :D
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Re: vla radio telescope v2 progress

Post #3by DOJOMO » 23.01.2011, 16:21

A delightful model. What next!!!
Regards, David.
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Re: vla radio telescope v2 progress

Post #4by MiR » 26.01.2011, 14:01

Good work, Selden!

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Re: vla radio telescope v2 progress

Post #5by bh » 29.01.2011, 16:58

Yes... super .3ds as well please.
regards...bh.

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Re: vla radio telescope v2 progress

Post #6by selden » 29.01.2011, 17:54

bh,

Why do you want a 3DS version?

3d_molier is already selling a model of a VLA telescope in many formats, including 3DS. I'm reluctant to
a. have my free version compete with that
b. entice someone to try to plagiarize and sell my version.

See http://www.turbosquid.com/FullPreview/I ... /ID/410524
Selden

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Re: vla radio telescope v2 progress

Post #7by bh » 29.01.2011, 18:21

Yes... I totally understand Selden... sometimes I like to import models into Bryce.
regards...bh.

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Re: vla radio telescope v2 progress

Post #8by Cham » 29.01.2011, 18:28

Selden,

when do you intend to release your new model ?
"Well! I've often seen a cat without a grin", thought Alice; "but a grin without a cat! It's the most curious thing I ever saw in all my life!"

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Re: vla radio telescope v2 progress

Post #9by selden » 30.01.2011, 11:24

I don't know. It's taking a lot longer than I expected.
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Re: vla radio telescope v2 progress

Post #10by Telepath » 31.01.2011, 07:19

selden wrote:The support structure is implemented using "cubes" -- each strut is composed of a single rectangular solid with only 8 vertices.
Hi Selden,

You might want to consider using "cubes" with a triangular section (ie. 6 vertices) for many of the finer struts on the rear of your dish. This is a 25% reduction in vertices for those parts (and probably wouldn't impair their appearance).
Perhaps may only result in a 10% reduction overall taking into account the remaining mesh, but may still be worth the effort.
DISCLAIMER: Although this post may contain a question, this does not nescessarily mean that it is a quiz. :wink:

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Re: vla radio telescope v2 progress

Post #11by selden » 31.01.2011, 11:26

Telepath,

Thanks a lot for the suggestion, but there are several reasons why I probably won't do that.
1. cubes are a primitive in the modelling program that I use, but 6-vertex objects aren't.
2. I've already redone the dish support structure several times and I'm quite sick of it!
3. a 25% reduction isn't quite enough of an improvement for me to be willing to spend the time redoing everything yet again.
Selden

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Re: vla radio telescope v2 progress

Post #12by selden » 06.02.2011, 01:22

Some progress to show. I'd guess the reflector assembly is about 75% finished: The secondary reflector assembly is only a placeholder, and the counterweight assembly isn't finished.

Then I'll have to do a major revision of the yoke assembly. It has to be made narrower to match the scale of the rerlector's support structure, which affects just about all of its components in non-linear ways :(
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Re: vla radio telescope v2 progress

Post #13by selden » 27.02.2011, 17:26

Another progress report: the vertex feed horn assembly is mostly finished. I haven't added the heaters yet.

The meshes are still growing:
Dish: 77K vertices
Yoke: 20K
Base: 12K
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Re: vla radio telescope v2 progress

Post #14by selden » 05.03.2011, 15:21

I think I'm pretty much done with the dish. It's at 88K vertices.
Now to fight with resizing the yoke....
Selden

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Re: vla radio telescope v2 progress

Post #15by Reiko » 06.03.2011, 05:58

Are you going to add a Dr. Floyd standing on the stairs? :wink:

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Re: vla radio telescope v2 progress

Post #16by selden » 06.03.2011, 14:18

:)
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Re: vla radio telescope v2 progress

Post #17by Fenerit » 06.03.2011, 21:34

selden wrote:I think I'm pretty much done with the dish. It's at 88K vertices.
Now to fight with resizing the yoke....

No bad at all for such a structure. It seem very optimized. 8)
Never at rest.
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Re: vla radio telescope v2 progress

Post #18by selden » 03.04.2011, 22:15

"Almost done." Yeah, right.
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Re: vla radio telescope v2 progress

Post #19by Cham » 03.04.2011, 22:22

Very CoOl ! Can't wait to show it to my students ! :)
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Re: vla radio telescope v2 progress

Post #20by Aphyle2007 » 04.04.2011, 14:27

Reiko wrote:Are you going to add a Dr. Floyd standing on the stairs? :wink:
What about Jodie Foster?


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