Realtime shaders - drawing lines and text 2004-06-19 - By Felix Gebhardt
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Perfect! :)
Alain Laferri�re wrote:
> Hi Felix,
>
> The display callback checks for the custom property's "Active" parameter
> to know if it should display anything. The actual overhead of XSI
> invoking this callback and then verifying this parameter should be
> negligible. And you can control this parameter from scripting, if needed.
>
> I hope this helps,
> Alain
>
> -- --Original Message-- --
> From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf
> Of Felix Gebhardt
> Sent: Saturday, June 19, 2004 7:29 PM
> To: XSI@(protected)
> Subject: Re: Realtime shaders - drawing lines and text
>
>
> Hi Alain, this looks really promising! Thanks a lot for this gem. I would
> have a (speed neurotic) question though. How critical would you say is
> the overhead of having it around all the time when I, say, need it only
> if I have a particle cloud containing custom vectors? Is the overhead
> neglectable? Is it easy to activate the callback only when needed? What
> do you think?
>
> In any way your example is much appreciated! Thanks again, Felix
>
>
> Alain Laferri�re wrote:
>> Hello,
>>
>> Just a follow-up on that thread : you can use the Xgs_Slate example
>> that I posted on XSINet ( including source code ) to see how to
>> display text and texture bitmap information in XSI views. This uses a
>> XSI 4.0 Xgs display callback to draw things at a scene-level so you
>> will not have a problem with things being drawn more than once as when
>> working with a realtime shader applied on a material used by multiple
>> objects.
>>
>> I hope this helps,
>> Alain
>>
>> -- --Original Message-- --
>> From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On
>> Behalf Of Homam Bahnassi
>> Sent: Thursday, March 04, 2004 4:48 PM
>> To: XSI@(protected)
>> Subject: RE: Realtime shaders - drawing lines and text
>>
>> 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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