Hello,
I'm looking to get the following scenario working:
A scene with a HUD rendering on a distortion mesh using slave
cameras.
What I've tried so far is...
1. A normal Viewer class with two Cameras in the scene graph, one on a
pre-render pass that renders the main scene to a texture and one on a
post-render pass that renders a screen space mesh with the other Camera's
texture applied to it.
2. A Viewer class with two Cameras attached as slaves, with the same pre-
and post-render setup as above. The RTT (pre-render) Camera has the main scene
as the child and the mesh (post-render) Camera has just the screen space mesh
as a child.
For these, I can get a HUD displaying on the following Cameras when I attach it
as a child to the respective Camera:
- 1's pre-render Camera, attached to the texture and set up as a FBO
- 1's post-render Camera
- 2's post-render Camera
For my HUD, I'm simply creating a Camera with an Absolute reference frame,
orthogonal 2D projection, and on the post-render pass. See osghud.cpp, as I've
pretty much copied that with the modification of an optional Texture parameter.
The part I'm having trouble getting to work is getting that HUD rendering to a
texture when that RTT Camera is a slave of a View. The thing that baffles me is
I can get it working on a non-slave RTT Camera in the same way, and I can get
it working on a non-RTT slave Camera, but not the intersection of both.
I've tried searching for a similar solution, but I haven't found anything for
this specific scenario. Any help or direction would be appreciated. :)
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