Hi, Guy,
Great explanation, except you didn't say what the problem was :-)
--"J"
Guy Volckaert wrote:
Hi,
I was wondering is someone can help me with a specific problem I'm having with render-to-texture. In essence, I have a pre-render camera (i.e m_pRttCamera) that renders the entire scene to a rectangular texture (i.e m_pRttTexture). This texture is the mapped to a simple quad that fills the entire screen.
The problem occurs when the user resizes the window (note: all's well before
resizing the window). The result of resizing the window is a fully black scene.
I know that I need to "invalidate" the texture since the window size has
changed. The following code gets called whenever the window is resized:
Code:
void CGeViewport::ResizeRtt( )
{
if( m_pRttTexture )
{
// Get the size of the main camera's viewport. This is *not*
// the RTT camera.
int32 nWidth = m_pCamera->getViewport()->width();
int32 nHeight = m_pCamera->getViewport()->height();
// Resize the render-to-texture according to the viewports size.
m_pRttTexture->dirtyTextureObject( );
m_pRttTexture->setTextureSize( nWidth, nHeight );
// Adjust the quad's texture coordinates.
osg::Vec2Array* pTexCoords = (osg::Vec2Array*)(
m_pRttQuad->getTexCoordArray( 0 ) );
(*pTexCoords)[1].set( 0, 0 );
(*pTexCoords)[1].set( nWidth, 0 );
(*pTexCoords)[2].set( nWidth, nHeight );
(*pTexCoords)[3].set( 0, nHeight );
}
}
The viewport of the RTT camera is the same as the main camera. To do so, I call
the following function:
m_pRttCamera->setViewport( m_pCamera->getViewport( ) );
I tried several things but nothing worked. Any advice would be appreciated.
Cheers,
Guy
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=14009#14009
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