Realtime shaders - drawing lines and text 2004-03-04 - By Felix Gebhardt
Back
Thanks for the help Homam and Guy. Ok, line rendering is straight forward.
For text I found something based on Freetype here:
http://homepages.paradise.net.nz/henryj/code/index.html#FTGL
I don't mind aliasing at all so it looks like it does more than I ever need.
Cheers,
Felix
Guy Rabiller wrote:
> Also, the Freetype library is a good candidate for text with OpenGL.
>
>> Real-time shaders are a great candidate for
>> this... And it should be fairly easy to do it
>> considering the samples provided with the SDK.
>> Note that real-time shaders operate on a
>> per-material basis, and might get called multiple
>> times for all objects using that material. Still,
>> this can be solved easily.
>> For text output, unfortunately I can't help much
>> with OGL, but looks like the scenario is pretty
>> the same with D3D (which we're using). We just use
>> textured quads that contain characters sampled
>> from a "font" texture. For simplicity, the font is
>> monospace, so the calculations are speedy.
>>
>> Lines on the other hand, are easy and directly
>> supported by the 3D API, still, if you need fancy
>> line capabilities (width, capping...etc), you're
>> back to simulating them with triangles...
>>
>> I hope this helps,
>> Homam Bahnassi
>> 3D Supervisor
>> In|Framez
>>
>>
>>
>>> -- --Original Message-- --
>>> From: Felix Gebhardt
>>> [mailto:gebhardt@(protected)]
>>> Sent: Wednesday, March 03, 2004 8:05 PM
>>> To: XSI@(protected)
>>> Subject: Realtime shaders - drawing lines and
>>> text
>>>
>>> I'm in the need to dynamically draw lines and
>>> positioned text into the
>>> viewport. Something like the normals display of
>>> the
>>> User_Normal_Editing.Addon and the name that gets
>>> displayed if one activates
>>> the "Name" checkbox in the Camera_Visibility
>>> Attributes. Realtime shaders
>>> seem like an option!?
>>>
>>> Anyone cares to share some hints and directions
>>> about what library to use
>>> and what to look for? Is it possible to use Glut
>>> as I can't find any font
>>> rendering in GLExt? Any other possibilities or
>>> ideas?
>>>
>>>
>>
>>
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