Hi, i'm using FBO to render offscreen and i have found a little problem when i need to resize the target object.
i have the following scenario: 1. I set up a camera to use FRAME_BUFFER_OBJECT (as osgprerender). 2. I attach an Image to it with camera.attach (leaving OSG to control de RenderBuffer object). 3. I render once. (viewer.frame()). 4. I take a snapshot of the image using osgDB.writeImageFile Until here all runs ok. I have a pretty file with the rendered frame as expected. But since i want to be able to resize the target (Image) between frames render, i do next the following: 5. Simulate a resizing (growing up), changing the image size (hence changing the internal buffer) or creating a new Image with different size. 6. setting Viewport from the camera to the desired size. 7. I attach the new image to the camera (or the original resized one). 8. I render once again. (viewer.frame()). 9. I take a snapshot of the image. The problem is that the internal FBO that RenderStage controls doesn't notice the attachment's change, and therefore doesn't call fbo.setAttachment, so what i have in the second snapshot (step 9) is only a piece of the image rendered. If i have understand correctly the framebuffer_object spec, it says that the FBO doesn't have sizing fields internally, and the final size is governed by the attachment (here the image). I 'feel' that renderstage only calls fbo.setAttachment when the fbo is initialized. If this where the case, then how can i force RenderStage to reattach the fbo without creating it again? I will try to use the fbo.dirtyAll, but first i must realize how can i get at it. Of course, i also could have missed something. I have a test code with the problem, so if it must be tested, i can upload it. Another side effect of renderstage (independent for this problem) is that it also attach another renderbuffer to the depth_component internally, with or without being said. Is this avoidable? Thanks. Himar.
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