20050630: IDV - McIDAS Area Files and Pixel Sampling

>From: Murphy Sean <address@hidden>
>Organization: US Navy
>Keywords: 200506301649.j5UGnJjo011822

Hi Sean-

>I tried it again an the image never renders.
>
>No out of memory message ever occurs.

I'm thinking it might be a problem with the Apple Java 3D. 
Can you try this on a non-Mac?

Even if you do get it displayed, the performance will
be degraded by such a large image.  I think your best
bet would be to subset the image.

Don

>
>On Jun 30, 2005, at 9:50 AM, Unidata Support wrote:
>
>>> From: Murphy Sean <address@hidden>
>>> Organization: U.S. Navy
>>> Keywords: 200506292011.j5TKBqjo024031 IDV large image
>>>
>>
>> Hi Sean-
>>
>>
>>> I am using version 1.2rc
>>>
>>> I get absolutely nothing!
>>>
>>
>> If you are running the shell script to start the IDV from
>> a terminal window, do you get an OutOfMemory error?
>>
>> Another thing is that for such a large image, it takes a while
>> to render.  It might take a minute after the please wait message
>> is gone.
>>
>>
>>> I am using OS X, and Apple is the keeper of all things java on OS X.
>>> i.e. J3D, JAI, I am using version 01.4.2_07 of the SDK
>>>
>>> Video Card - nVidia, GeForce FX 5200 - 64MB
>>>
>>> Texture Performance - up to 16 textures per pass (not sure if that is
>>> what you are referring to )
>>>
>>> I also just tested it with a larger file and I had to sample even
>>> higher to get it to render.  This additional data point lends itself
>>> to the idea that I am exceeding a limitation in the video card.
>>>
>>
>> VisAD determines the texture size from the card and then
>> breaks the image up into the appropriate number of textures.
>> So, you shouldn't be exceeding the card limitation.
>>
>> Don Murray
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>
>--
>Sean M. Murphy
>Naval Undersea Warfare Center
>1176 Howell Street
>Code 2511, Bldg. 1171
>Newport, RI  02841-1708
>v: 401.832.6209
>f: 401.832.4749
>address@hidden
>
>
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