[osg-users] Render to texture and ClearColor

Robert Osfield robert.osfield at gmail.com
Thu Jul 24 04:53:07 PDT 2008


Dous you FBO have an alpha channel????

On Thu, Jul 24, 2008 at 12:42 PM, David _ <solid_davidian at hotmail.com> wrote:
> Hi
>
> i´m currently rendering to a texture using a slave camera
>
> my problem is that i can´t set the clear color to alpha. Each time the slave
> camera renders a new frame i get a nice blue background instead of the
> transparent background i´m looking for
>
> i´ve tried with values of 0.0, 0.5 add 1.0 for alpha
>
> camera->setClearMask( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
> camera->setClearColor(osg::Vec4(0.0f,0.0f,1.0f,0.0f));
> camera->setColorMask(true, true, true, true);
>
> i´ve created the texture2d attached to the camera from and osg::image with
> GL_RGBA and GL_UNSIGNED_BYTE formats and also i´ve tried by creating the
> texture2d with no parameters and setting later the
> texture->setInternalFormat(GL_RGBA)
>
> any idea of what i´m doing wrong???
>
> thanks in advance
>
>
>
>
>
>
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