Forums > Jitter

far & near clip

June 22, 2008 | 3:54 pm

Hello,

Is there any equivalent feature for an gl object specifically ?

Thank you.


June 22, 2008 | 6:17 pm

On Sun, Jun 22, 2008 at 4:54 PM, Derrick Giscloux
wrote:

>
>
> Is there any equivalent feature for an gl object specifically ?
>
>
You can use clip planes for this. They let you specify the position and
normal and will then clip all geometry on one side of it. You can use it to
cut objects in half and such. The tricky thing is to set them at the right
position, facing the right way. If you want the equivalent of far/near
clipping you’ll have to align them with the camera. You also need to
enable/disable them using glEnable/glDisable, and then draw the geometry you
want to clip in between those 2 calls, so you need full control over your
opengl state using sketch or js or something.

You can find more info in the redbook, but I’m sure there are also tutorials
online.

Thijs


June 22, 2008 | 7:23 pm

Hi,

I am creating a patch using jit.gl.gridshape and using some quicktime
movies for textures. I am also using some msp audio. The video is
running really slow and so is my computer. basically, I don’t feel
that with my current setup what I’m trying to do is possible.

I have max 5 and a 1.25 Ghz Powerbook G4 with 1G of Ram. I’ve tried a
similar patch in Max 4 and it was also too slow.

Maybe this just won’t work because my computer isn’t fast enough and
too old. I currently do not have a graphics card, but if I got one
would it be speed up my computer enough to use open GL, textures, and
MSP audio?

I have been looking around and wondered if either of these two cards
are recommended for Max users:

ATi Radeon HD 2600 XT

NVIDIA GeForce 8800 GT

thank you and any recommendations would be greatly appreciated.

thanks, nick


June 22, 2008 | 10:20 pm

1. Please create a new email when posting to the list. don’t just reply to an existing topic (the forum will attach your topic to the one you replied to. confusion follows.)

2. vade’s optimizations? can’t really help you without knowing more precisely what you’re doing in your patch. (colormode, @unique, resolution, codec, etc.)

3. you *do* have a graphics card, otherwise you wouldn’t see anything. your graphics card shouldn’t be too old-fashioned, but you may have issues with some advanced shaders. upgrading to either of those cards could certainly help, but i’m not sure how difficult it is to upgrade a powerbook’s graphics card. might be more worthwhile to save money and get a macbook pro.

in any case, i’ve seen plenty of great jitter stuff come off of a powerbook.


June 22, 2008 | 11:23 pm

ok, thanks for your reply.

On Jun 22, 2008, at 6:20 PM, Robert Ramirez wrote:

>
> 1. Please create a new email when posting to the list. don’t just
> reply to an existing topic (the forum will attach your topic to the
> one you replied to. confusion follows.)
>
> 2. vade’s optimizations? can’t really help you without knowing
> more precisely what you’re doing in your patch. (colormode,
> @unique, resolution, codec, etc.)
>
> 3. you *do* have a graphics card, otherwise you wouldn’t see
> anything. your graphics card shouldn’t be too old-fashioned, but
> you may have issues with some advanced shaders. upgrading to
> either of those cards could certainly help, but i’m not sure how
> difficult it is to upgrade a powerbook’s graphics card. might be
> more worthwhile to save money and get a macbook pro.
>
> in any case, i’ve seen plenty of great jitter stuff come off of a
> powerbook.


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