Hi everyone,
I'm now going through the osgdistortion example. Based on my understanding,
this example is to rendering the scene on the texture istead of the screen.
Through distorting the texture, the distorted model could be build and shown.
However, I'm a little confused about the rendering process to distort the 3D
model.
Part of the code is shown below:
for(i=0;i<noSteps;++i)
{
osg::Vec3 cursor = bottom+dy*(float)i;
osg::Vec2 texcoord = bottom_texcoord+dy_texcoord*(float)i;
for(j=0;j<noSteps;++j)
{
vertices->push_back(cursor);
texcoords->push_back(osg::Vec2((sin(texcoord.x()*osg:: PI-osg::
PI*0.5)+1.0f)*0.5f,(sin(texcoord.y()*osg:: PI-osg:: PI*0.5)+1.0f)*0.5f));
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
cursor += dx;
texcoord += dx_texcoord;
}
}
polyGeom->setVertexArray(vertices);
polyGeom->setColorArray(colors);
polyGeom->setTexCoordArray(0,texcoords);
I'm not sure how the rendering process works. Could anyone tell me that are the
original points' coordinates stored in 'vertices', and the distorted points'
coordinates stored in 'texcoords'?
Another question is that why the texture is defined as 2D? Could I define a 3D
texture, then rendering a distorted model on the 3D texture and display it on
the screen?
Thank you so much for helping me on this!
Cheers,
Ying
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=59668#59668
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