Re: [osg-users] Problem with my cubemap
Jean-Sébastien Guay wrote: If there *is* a special format for a cube map contained in a .dds file, perhaps the OSG .dds loader doesn't handle it correctly? I don't know, but you could investigate by checking the code. Again, perhaps someone else has more insight into this. DDS files can contain multi-surface images, including cube maps. The problem is that there is currently no Image class in OSG that will hold a cube map, so there is no way for the .dds plugin to return a cube map. I had a similar problem when I wrote the .vtf loader for Valve textures. --J ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with my cubemap
On Fri, May 15, 2009 at 3:34 PM, Jason Daly jd...@ist.ucf.edu wrote: Jean-Sébastien Guay wrote: If there *is* a special format for a cube map contained in a .dds file, perhaps the OSG .dds loader doesn't handle it correctly? I don't know, but you could investigate by checking the code. Again, perhaps someone else has more insight into this. DDS files can contain multi-surface images, including cube maps. The problem is that there is currently no Image class in OSG that will hold a cube map, so there is no way for the .dds plugin to return a cube map. Indeed there isn't a osg::Image class that does cube maps yet. I have been pondering on this issue for a quite while as this topic does occasionally come up. The way to tackle is to have an osg::CompositeImage/ImageList/ImageArray subclass from osg::Image that provides a list of images that can be assigned to a osg::Texture. One would want to scoop up the needs of the texture array support at the same time. Ideally we'd have an ImageBase class rather than subclassing from Image or refactor Image so it's a base class, and then have concrete implementations subclass from this. It's kinda awkward to undertake such a refactoring now though. A template for an ImageArray class could be the ImageSequence class that already holds a list of images internally. Others are welcome to dive in an add this ImageArray class ;-) Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with my cubemap
Robert Osfield wrote: A template for an ImageArray class could be the ImageSequence class that already holds a list of images internally. Others are welcome to dive in an add this ImageArray class ;-) I thought about it while I was writing the .vtf loader, but I was under time pressure, and the Image code was fairly complex at first look, so it kind of scared me off :-) --J ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with my cubemap
Hello Robert, I've originally contributed the .dds cubemap loading capability that you rejected. From that time I've been merging my changes with the latest head. Cubemaps can still be loaded succesfully, but I agree that it may be better to split osg::Image into multiple classes for the different osg::Textures that it feeds. Are you envisioning a separate Image class for each Texture class? Side note: Last week I ran into a problem with cubemaps in the osgOcean example which turned out to be a pixelformat problem. The osgOcean example uses 6 separate images of which one image has a different pixel format. My osg::Image class supporting cubemaps has only one pixelformat for all 6 data planes and this caused a problem when copying the six images into the single cubemap image. kind regards, Roland Smeenk -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12269#12269 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with my cubemap
HI Roland, On Fri, May 15, 2009 at 4:40 PM, Roland Smeenk roland.sme...@tno.nl wrote: I've originally contributed the .dds cubemap loading capability that you rejected. From that time I've been merging my changes with the latest head. Cubemaps can still be loaded succesfully, but I agree that it may be better to split osg::Image into multiple classes for the different osg::Textures that it feeds. Are you envisioning a separate Image class for each Texture class? No, my proposal of an osg::ImageArray class would need to be compatible with all Texture types. Not all would know enough about it to make use of it. My thought was the the osg::Image base classes sizes/type data pointers would be assigned to one of the osg::Image that the ImageArray manages so that a simple Texture2D texture would just select one of them, but a TextureCubeMap could go look for images 0,1,2,3,4,5, etc. Side note: Last week I ran into a problem with cubemaps in the osgOcean example which turned out to be a pixelformat problem. The osgOcean example uses 6 separate images of which one image has a different pixel format. My osg::Image class supporting cubemaps has only one pixelformat for all 6 data planes and this caused a problem when copying the six images into the single cubemap image. In the context of the osg::ImageArray class you'd probably want a function for querying of all the images are compatible, and perhaps a function for making them all the same. Possible texture cube map would also need to be written to cope between with different pixel formats. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with my cubemap
Bonjour Kévin, I try to create a cubeMap on a sphere. It works but all my images (.bmp) on cubemap's faces are flip ... You can flip images with osg::Image::flipHorizontal() or osg::Image::flipVertical(). I don't know why they come out that way by default though. Perhaps your BMPs assume (0,0) is at the top-left corner instead of the bottom-left? I don't know if there's something in the format that specifies this. In addition, with .dds files I have this error for each file : I have no idea about these errors, I've used other tools to convert images to .dds compressed files and could use them without problems. I'll let others help with this part. And, last question : someone has succeed to load one file .dds which contains the cubemap ??? Well, I've loaded one image that contained a cube map (both in .dds and in .png format) but that's because it was a vertical cross cube map and I extracted each face manually from the image. I don't know if there's some special format for .dds files containing cube maps, I just used it as a normal image and did whatever I wanted with it just like any other image file. If there *is* a special format for a cube map contained in a .dds file, perhaps the OSG .dds loader doesn't handle it correctly? I don't know, but you could investigate by checking the code. Again, perhaps someone else has more insight into this. 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] Problem with my cubemap
Jean-Sébastien Guay wrote: You can flip images with osg::Image::flipHorizontal() or osg::Image::flipVertical(). I don't know why they come out that way by default though. Perhaps your BMPs assume (0,0) is at the top-left corner instead of the bottom-left? I don't know if there's something in the format that specifies this. There is an option in BMP to specify this, if I recall. I don't know if the OSG BMP loader understands it. -- Chris 'Xenon' Hanson, omo sanza lettere Xenon AlphaPixel.com PixelSense Landsat processing now available! http://www.alphapixel.com/demos/ There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with my cubemap
Hi Kevin; If you have problem creation on cubeMap you can use Cube Map Generater to create your dds file on http://developer.amd.com/gpu/cubemapgen/pages/default.aspx But as Jean said I don't know you can success on loading dds formated cubemap on OSG, it might not be supported. HTH, Regards. 2009/5/15 Chris 'Xenon' Hanson xe...@alphapixel.com Jean-Sébastien Guay wrote: You can flip images with osg::Image::flipHorizontal() or osg::Image::flipVertical(). I don't know why they come out that way by default though. Perhaps your BMPs assume (0,0) is at the top-left corner instead of the bottom-left? I don't know if there's something in the format that specifies this. There is an option in BMP to specify this, if I recall. I don't know if the OSG BMP loader understands it. -- Chris 'Xenon' Hanson, omo sanza lettere Xenon AlphaPixel.com PixelSense Landsat processing now available! http://www.alphapixel.com/demos/ There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Ümit Uzun ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
