Hi Chris,
Thanks for the heads up, I was digging around and found the drawImplementation
method in Drawable myself so decided to give it a go. However I've had less
than spectacular results!
My first test was to take the code from ShapeDrawable that draws a box. Here it
is for completeness
The clipping you are seeing is probably due to osg's computation of
the near and far clipping planes.
You'll need to implement computeBound so osg knows about your object.
Have a look in ShapeDrawable.cpp
2009/8/10 Andrew Thompson andyb1...@yahoo.co.uk:
Hi Chris,
Thanks for the heads up, I was
Hi,
Well, that was simple
Code:
virtual osg::BoundingBox computeBound() const
{
osg::BoundingBox bbox;
// Compute the min/max X and Y values for the grid
float miny = (m_posY-(m_vHeight/2*m_zoom));
float maxy = (m_posY+(m_vHeight/2*m_zoom));
float minx =
Hi there,
A simple question, would anyone know how I could implement an infinite grid in
OSG?
This is an image showing what I am trying to achieve.
[Image: http://i137.photobucket.com/albums/q217/andyb1979/InfiniteGrid.png ]
Ideally as the user zooms in/out I would like the grid to
Edit:
Perhaps another way of asking this question - I know how to render my grid
using OpenGL calls, I would basically use glBegin(GL_LINES) / glEnd and draw
the lines at the appropriate spacing and thickness.
So the question is - is there a way to directly push something onto the GL
wrote: -
To: osg-users@lists.openscenegraph.org
From: Andrew Thompson andyb1...@yahoo.co.uk
Sent by: osg-users-boun...@lists.openscenegraph.org
Date: 08/07/2009 09:42AM
Subject: [osg-users] Infinite Grid in OSG
Hi there,
A simple question, would anyone know how I could implement an infinite
Ok, so I could use a HUD and attach behind my scene - clever, I like it :-)
Now the question is, how do I get access to just glBegin/glEnd?
I was thinking of creating a class that inherits ShapeDrawable and just
rendering my lines (I have found some legacy code that calculates the lines and
...@lists.openscenegraph.org wrote: -
To: osg-users@lists.openscenegraph.org
From: Andrew Thompson andyb1...@yahoo.co.uk
Sent by: osg-users-boun...@lists.openscenegraph.org
Date: 08/07/2009 10:57AM
Subject: Re: [osg-users] Infinite Grid in OSG
Ok, so I could use a HUD and attach behind my scene - clever, I
Ok, wise advise, just since this is a grid (Rendered once) per frame, I will
need to resize the grid lines/thicknesses/spacing on every frame (as I zoom/pan
my scene).
I guess I have enough to go digging now though, certainly you've given me some
good ideas,
Thank you,
Andrew
Brian R Hill wrote:
Andrew,
You could implement it as an ortho projection (look at HUD examples) and
draw text and lines as geometry based on current scale and position.
You can create a custom drawable that does anything at all you want when its
code is called.
Brian
--
Chris 'Xenon'
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