robertosfield wrote: > Hi Alexej, > You don't need to change the render-target to re-render a tile. I > can't work out exactly what you mean in your scheme but it sounds a bit odd.
The problem is not the re-rendering of a single tile. The job is to re-render a tile subset from a collection of tiles (each tile has an unique texture object bound to it). robertosfield wrote: > > While I do understand what you are specifically doing or how/why you > are trying to achieve it as general notes I would say: > > You can have many RTT osg::Camera in the scene and these scene graph > objects themselves are pretty small compared the texture/buffer data > assigned to them, also it's possible to share subgraphs under Cameras > so the scene graph specific costs are likely to be very small, so no > need to go to lengths to try and avoid creating them. Assuming I will do it this way. 1. Will I have to enable/disable cameras in relation with the dirty state of the tile? (otherwise all cameras will re-render the tiles, even these, with no changes). 2. What about the rendering context for each camera? Does it not produce extra costs? E.g. the depth RenderBuffer (which could be shared using render-target exchange approach) and other meta data (as I understand from RenderStage::runCameraSetUp(..)) It may be wrong: osg is not easy to understand, especially since the most classes do not even describe their main purpose (in doxygen). But for me, the approach with changing the render color target looks still more efficient, assuming I can change the color binding in a fast and light-way manner. Because all camera parameters stay constant all the time except the position and color-target. Otherwise it requires one frame() call per tile re-rendering, here I don't know, how expensive that is compared to hundreds of possible cameras approach (but usually only few tiles needs to be re-rendered). The main question remains: is there a light-way possibility to change the color binding in an already existing RenderStage/FBO context ? ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=47708#47708 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
