Realtime shaders - drawing lines and text 2004-06-19 - By Alain Laferrière
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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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