Hi All,
I'm struggling with a warping implementation to show a 3D scene to a curved
screen.
I gave a look at osgdistortion example and implemented a RTT camera just like
in that example.
So now I have a render to texture camera that generates a texture of the 3D
scene. Then a HUD camera with a geode as child where its geometry is attached
to the texture.
I have a csv file that describes the screen shape as mesh of points. The file
contains the following data: x,y,z,u,v.
Each line represents the x,y,z patial coordinates of a screen point.
For a different project that uses Unity and C#, a colleague implemented the
warping basically in this way:
Code:
Vector2[] uvs = new Vector2[mesh.vertices.Count()];
for (int i = 0; i < mesh.vertices.Count(); i++) {
Vector3 pos = camera.WorldToViewportPoint(mesh3d.vertices[i]);
uvs[i] = new Vector2(pos.x, pos.y);
}
mesh.uv = uvs;
I didn't find a WorldToViewportPoint method in OSG but I find some references
on the web to implement it.
On the other hand it seems the osgdistortion example is implemented differently.
One more thing I have to say is that projectors and curved screen are fixed
while the observer is sitting on a moving platform. So I have to correct the
camera frustum first.
Anyway, could you please suggest and explain me how to implement the warping
considering that it would be also nice to use a shader to improve performance
(if possible)?
Cheers,
Gianni
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=69219#69219
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