Re: [osg-users] Clearing window client area.
Now I understand! That makes perfect sense to me now. I tried calling GraphicContext::setClearMask(GL_COLOR_BUFFER_BIT) in my app and now it works as expected. Thanks... your the best. Guy -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35663#35663 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Clearing window client area.
Hi Guy, I guess I could have been a little clearer in my description. So here's an example that should help: You're right, the description you gave this time makes things a lot clearer. The camera will only clear its viewport. And that makes sense, since the camera should only ever affect pixels inside its viewport... Even though after swap buffers, the context's clear() method is called as you've seen (good that you went to look at the code BTW, great initiative), the context does not do any clear because, as you can see in the doc of GraphicsContext::setClearMask() : "Set the clear mask used in glClear(). Defaults to 0 - so no clear is done by default by the GraphicsContext, instead the Camera's attached the GraphicsContext will do the clear. GraphicsContext::setClearMask() is useful for when the Camera's Viewports don't conver the whole context, so the context will fill in the gaps." So there you have it, a solution to your problem :-) (note, "[...] the Camera's attached the GraphicsContext [...]" should read "[...] the Cameras attached to the GraphicsContext [...]", I should probably submit that correction to Robert :-) ) Note that if you set the context's clear mask to a non-zero value, you could then set the camera's clear mask to 0. No sense in clearing the whole context, and then clearing the camera's viewport a second time... Unless you want them cleared to a different color, or to clear different parts of the buffer. Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Clearing window client area.
I guess I could have been a little clearer in my description. So here's an
example that should help:
1) I have a osg::camera of size 640x480. So the window's client area is
640x480, or GraphicsContext::Trats::(x,y,width,height) = (0, 0, 640, 480).
2) The GL viewport of this camera is 320x240, i.e osg::Camera::setViewport(0,
0, 320, 240).
3) When I render the scene, the windows area outside the GL viewport is not
cleared.
Note that I set the osg::Camera::setClearMask(GL_COLOR_BUFFER_BIT |
GL_DEPTH_BUFFER_BIT);
I found that context should be clear via the following function:
Code:
void SwapBuffersOperation::operator () (GraphicsContext* context)
{
context->swapBuffersImplementation();
context->clear();
}
But for some reason, it doesn't. I'll try to modify one of the examples and see
if the problem occurs as well.
Guy
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=35659#35659
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Re: [osg-users] Clearing window client area.
Hello Guy, I have a stituation where the viewport is smaller than the windows, causing the region outside the viewport to not be cleared properly. Does anyone know how to clear the background window? By viewport do you mean osg::View? And by window do you mean context? If so then just create another view that covers the whole context, set its camera's clear color to the color you want, the camera's render order to be before the other view's camera, and keep its scene data empty. It will just do a glClear of the whole context. You can then disable clear on the other view's camera to save a bit of time. But if you mean you want to clear a Win32 window and your graphics context doesn't cover the whole window, then I wouldn't know. Sorry. Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
