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[jitter] polygon smoothing with jit.gl.sketch

Jeremy Rotsztain jeremy at mantissa.ca
Sat Nov 3 21:59:05 MDT 2007


i'm just rendering a texture on a skewed plane.
ah, it just occurred to me that fsaa is supported by jit.window. thanks!
i wish i'd realized this 5 hours ago!

jeremy

On Nov 3, 2007, at 11:37 PM, Wesley Smith wrote:

> What are you trying to do?  Polygon smoothing has polygon ordering
> issues and is thus not a good solution for drawing antialiased
> polygons.  Have you tried fsaa?
> wes
>
> On 11/3/07, Jeremy Rotsztain <jeremy at mantissa.ca> wrote:
>>
>> thanks wes, how would this be supported in jitter? with shaders?
>>
>> jeremy
>>
>> On Nov 3, 2007, at 8:00 PM, Wesley Smith wrote:
>>
>>> polygon smoothing doesn't work on OSX in general.  If you want
>>> antialiasing on geometry you have to use fsaa.
>>>
>>> wes
>>>
>>> On 11/3/07, Jeremy Rotsztain <jeremy at mantissa.ca> wrote:
>>>>
>>>> has anybody figured out how to enable polygon smoothing?
>>>>
>>>> i'm trying to implement the following code (from the red book,
>>>> http://
>>>> www.glprogramming.com/red/chapter06.html#name2).
>>>>
>>>>     glCullFace (GL_BACK);
>>>>     glEnable (GL_CULL_FACE);
>>>>     glBlendFunc (GL_SRC_ALPHA_SATURATE, GL_ONE);
>>>>     glClearColor (0.0, 0.0, 0.0, 0.0);
>>>>
>>>>   glClear (GL_COLOR_BUFFER_BIT);
>>>>        glEnable (GL_BLEND);
>>>>        glEnable (GL_POLYGON_SMOOTH);
>>>>        glDisable (GL_DEPTH_TEST);
>>>>
>>>>
>>>>
>>>> here's the message i'm sending to jit.gl.sketch (i'm using ortho
>>>> projection)
>>>>
>>>> reset, glmatrixmode projection, glloadidentity,
>>>> glortho 0. 640. 480. 0. -5. 5., glmatrixmode modelview,
>>>> glloadidentity,
>>>> glcullface 2, glenable cull_face,  glblendfunc 10
>>>> 1, glclearcolor 0. 0. 0. 0., glclear, glenable blend,   glenable
>>>> polygon_smooth, gldisable depth_test, glcolor 1. 1. 1. 1.,
>>>> dim 200 200, glpushmatrix, glbegin quads, gltexcoord 0. 1.,
>>>> glvertex 91
>>>> 135, gltexcoord 1. 1., glvertex 339 154,
>>>> gltexcoord 1. 0., glvertex 335 380, gltexcoord 0. 0., glvertex 75
>>>> 367,
>>>> glend, glpopmatrix,
>>>>
>>>> am i using the wrong clear function? the red book recommentds
>>>> color_buffer_bit, but it's not clear how to access it.
>>>>
>>>> thanks,
>>>>
>>>> jeremy
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