Re: [PyMOL] High Resolution Ray Tracing

[Takanori N. <tak...@bs...>]

Hi,

By tweaking the projection matrix, we can divide a big scene into
several sub-images and render them separately. Thus, we can reduce
the memory consumption. I think this is scriptable, although I
don't have time to implement myself.

 > I was wondering if the developers have come across this upper limit too?
 > I have a 2400 dpi printer, so I want to go with the highest dpi possible
 > for the best quality.

"2400 dpi" for a printer does not have the same meaning as 2400
dpi (or better, ppi, pixel per inch) for a screen.
Printers use many dots to represent an image pixel.
Did you take that into the account? Probably you don't need 2400 dpi
or 1200 dpi.

https://en.wikipedia.org/wiki/Dots_per_inch#/media/File:DPI_and_PPI.png

Best regards,

Takanori Nakane

Am 2016年05月10日 um 09:34 schrieb Stephen Kerry:
> Thank you for trying this out on a workstation with 128 GB and then 256
> GB of RAM. It is much appreciated as I do not have easy access to that
> kind of computational power. The fact that you also get these segfaults
> with all of your RAM, suggests that this might be a PyMOL limitation,
> rather than a hardware issue.
>
> I have come to the conclusion that it is impossible to ray trace an
> image with an output resolution greater than 45 megapixels (7500 x
> 6000). Halving the dpi from 1200 to 600 gives a 11.25 megapixel (3750 x
> 3000) resolution.
>
> I was wondering if the developers have come across this upper limit too?
> I have a 2400 dpi printer, so I want to go with the highest dpi possible
> for the best quality.
>
> ------------------------------------------------------------------------
> *From:* David Hall <li...@co...>
> *Sent:* 06 May 2016 19:17:38
> *To:* Stephen Kerry
> *Cc:* pym...@li...
> *Subject:* Re: [PyMOL] High Resolution Ray Tracing
> Feel free to send me the files off list.
>
> -David Hall
>
>> On May 6, 2016, at 1:54 PM, Stephen Kerry <ste...@ou...
>> <mailto:ste...@ou...>> wrote:
>>
>> Dear All,
>>
>> I have a protein complex scene that I need to create a large, high
>> resolution (1200 dpi) ray traced image of, but am unable to do so as I
>> always run out of memory at the end of the ray tracing process, with
>> the following error:
>>
>> python2.7(972,0x7fff7397f300) malloc: ***
>> mach_vm_map(size=18446744068907188224) failed (error code=3)
>> *** error: can't allocate region
>> *** set a breakpoint in malloc_error_break to debug
>>
>> This is with PyMOL 1.81 from Fink on OSX 10.10 with
>> ani7-4790Kprocessor and 32 GB of DDR3. Python2.7 expands up to 15 GB
>> of RAM, with more than twice this reserved for virtual memory, but no
>> swap is actually used.
>>
>> Decreasing hash_max just increases the ray tracing time until the
>> error at the end. Sometimes PyMOL will be terminated with this error,
>> whilst at other times a transparent PNG is all that is produced.
>>
>> Is there a way to force PyMOL to use virtual memory to avoid these
>> errors/crashes at the expense of processing time?
>>
>> If not, is there anyone who has PyMOL 1.8x installed on a system with
>> 64 GB or more RAM, who would be able to render this ray traced image
>> if I send the, the .pse file and .pml script off list? Takes about 10
>> mins to process.
>>
>> Cheers,
>>
>> Stephen
>>
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>
>
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