[visionegg] Re: Multiple viewports, put_pixels
- From: tony@xxxxxxxxx
- To: visionegg@xxxxxxxxxxxxx
- Date: Wed, 7 Jun 2006 09:48:27 -0600 (CST)
I was thinking about this some more this morning. What if you set your
viewport to the entire screen before doing the "get pixels"?
> I'm not sure how much VisionEgg supports this natively, but I've been
> doing some work on an entirely unrelated problem that has been
> working ok for me :)
>
> I've been taking the projections that I've drawn and using some form
> of get_pixels to pull them off the screen, and then I'm copying them
> each to a texture. When I go to draw the final stimulus, I set the
> viewport to the entire screen, and draw quads with the appropriate
> textures on them. This allows full control over the entire screen.
>
> Like I said, I'm not sure how much VisionEgg supports this natively.
> I'd be willing to help out with this though if you're interested.
>
> Tony
>
>
> On 6-Jun-06, at 7:07 AM, Graeme Phillipson wrote:
>
>> Hello,
>> I'm trying to filter the output of vision egg on a per pixel basis
>> and I'm having a few problems. I am doing stereostopic back
>> projection, and the way it works is that one large screen sends the
>> left half of the screen to the left eye projector and the right
>> half to the right projector. So I have two viewport objects
>> connected to one screen, and that works very nicely.
>>
>> However because I am back projecting there is a very bright spot in
>> the screen, this isn't all bad as we wanted a gaussian shaped mask
>> over the stimulus anyway, so I have written code that uses
>> get_framebuffer_as_array/put_pixels to adjust the bright spot into
>> a nice gaussian shaped mask (incidently I don't care about speed as
>> my stimuli are static, but I do care about exactly what luminence I
>> get at each pixel, which is why I have chosen this rather slow way
>> of doing things).
>>
>> Since get_framebuffer_as_array/put_pixels are screen method I
>> thought I would get both viewports but what I actualy seem to get
>> is the contents of what viewport I drew in last.
>> If I do this:
>> screen.clear()
>> left_viewport.set(stimuli = left_stimulus)
>> left_viewport.draw()
>> right_viewport.set(stimuli = right_stimulus)
>> right_viewport.draw()
>> output_filters.filter_screen(screen)
>> I get exactly what I want for the right eye. If I do this:
>> screen.clear()
>> left_viewport.set(stimuli = left_stimulus)
>> left_viewport.draw()
>> output_filters.filter_screen(screen)
>> right_viewport.set(stimuli = right_stimulus)
>> right_viewport.draw()
>> I get mostly the right thing for the left eye but the right half of
>> the left eye is black.
>> If I do this:
>> screen.clear()
>> left_viewport.set(stimuli = left_stimulus)
>> left_viewport.draw()
>> output_filters.filter_screen(screen)
>> right_viewport.set(stimuli = right_stimulus)
>> right_viewport.draw()
>> output_filters.filter_screen(screen)
>> It mostly looks correct excet that the right half of the left eye
>> is black and the right eye has the left half black.
>>
>> So my question is, is this the right approach to useing put_pixels
>> with multiple viewports? If so what am I doing wrong, and if not
>> what should I be doing?
>>
>> Any help would be greatly appreciated!
>>
>> Thanks,
>> Graeme Phillipson.
>>
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