Re: [osg-users] Drawing to Texture2D
With libraries like Cairo available, I'm not sure why you'd need to write your own. I've written a glue module for Cairo/OSG which lets you use a vector graphics API on a Texture2D canvas. For example, the attached image was rendered using Cairo on a small texture (256x256). No image files were loaded or anything like that... http://osgcairo.googlecode.com It's not feature-complete or anything like that, but it demonstrates the concept. On Sat, 2008-07-12 at 22:29 +0100, James Dickson wrote: I decided to go down the route of writting my own line, circle etc algorithms as I only need a few, but I have hit a slight snag. :-( I have attached an image to show the effect I am getting, ideally I would like the Texture2D which is projected onto the billboard to be sharper? I.e the lines drawn on the white billboard not to have blurred edges. The texture resolution is 256x256, and increasing it only partially helps, are there any filters I can turn on\off for the texture to help fix it? Many thanks, James 2008/7/11 Jean-Sébastien Guay [EMAIL PROTECTED]: Hi James, I was wondering if it is possible to draw on a Texture2D instance. I know this isn't possible, but I am wondering if you can do the equivalent of: Texture2Dinstance-DrawCircle(x,y,r); OSG does not do 2D drawing to images. You can do your own by getting the data pointer from an osg::Image and drawing pixels into that (if you feel the need to write your own line, circle, flood-filling etc. algorithms :-) ), or you can use an imaging library (ImageMagick, etc.) to make the image and then get the data from that library and copy it into an osg::Image (or perhaps even use the same pointer if it's a raw format). No need to save the image to disk and re-read it with OSG. Hope this helps, J-S -- __ Jean-Sebastien Guay[EMAIL PROTECTED] 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 -- James Dickson ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org attachment: Screenshot-Untitled Window.png___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Drawing to Texture2D
Hi James, I believe you have to: texture-setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::NEAREST); texture-setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::NEAREST); -- Regards, Peter Wraae Marino www.osghelp.com - OpenSceneGraph support site On Sat, Jul 12, 2008 at 11:29 PM, James Dickson [EMAIL PROTECTED] wrote: I decided to go down the route of writting my own line, circle etc algorithms as I only need a few, but I have hit a slight snag. :-( I have attached an image to show the effect I am getting, ideally I would like the Texture2D which is projected onto the billboard to be sharper? I.e the lines drawn on the white billboard not to have blurred edges. The texture resolution is 256x256, and increasing it only partially helps, are there any filters I can turn on\off for the texture to help fix it? Many thanks, James 2008/7/11 Jean-Sébastien Guay [EMAIL PROTECTED]: Hi James, I was wondering if it is possible to draw on a Texture2D instance. I know this isn't possible, but I am wondering if you can do the equivalent of: Texture2Dinstance-DrawCircle(x,y,r); OSG does not do 2D drawing to images. You can do your own by getting the data pointer from an osg::Image and drawing pixels into that (if you feel the need to write your own line, circle, flood-filling etc. algorithms :-) ), or you can use an imaging library (ImageMagick, etc.) to make the image and then get the data from that library and copy it into an osg::Image (or perhaps even use the same pointer if it's a raw format). No need to save the image to disk and re-read it with OSG. Hope this helps, J-S -- __ Jean-Sebastien Guay[EMAIL PROTECTED] 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 -- James Dickson ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Regards, Peter Wraae Marino www.osghelp.com - OpenSceneGraph support site ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Drawing to Texture2D
I decided to go down the route of writting my own line, circle etc algorithms as I only need a few, but I have hit a slight snag. :-( I have attached an image to show the effect I am getting, ideally I would like the Texture2D which is projected onto the billboard to be sharper? I.e the lines drawn on the white billboard not to have blurred edges. The texture resolution is 256x256, and increasing it only partially helps, are there any filters I can turn on\off for the texture to help fix it? Many thanks, James 2008/7/11 Jean-Sébastien Guay [EMAIL PROTECTED]: Hi James, I was wondering if it is possible to draw on a Texture2D instance. I know this isn't possible, but I am wondering if you can do the equivalent of: Texture2Dinstance-DrawCircle(x,y,r); OSG does not do 2D drawing to images. You can do your own by getting the data pointer from an osg::Image and drawing pixels into that (if you feel the need to write your own line, circle, flood-filling etc. algorithms :-) ), or you can use an imaging library (ImageMagick, etc.) to make the image and then get the data from that library and copy it into an osg::Image (or perhaps even use the same pointer if it's a raw format). No need to save the image to disk and re-read it with OSG. Hope this helps, J-S -- __ Jean-Sebastien Guay[EMAIL PROTECTED] 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 -- James Dickson attachment: test.JPG___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Drawing to Texture2D
Hi James, Perhaps a Render To Texture Camera is what you are look for. Have a look at the osgprerender example. Robert. On Fri, Jul 11, 2008 at 3:20 PM, James Dickson [EMAIL PROTECTED] wrote: Hi, I was wondering if it is possible to draw on a Texture2D instance. I know this isn't possible, but I am wondering if you can do the equivalent of: Texture2Dinstance-DrawCircle(x,y,r); Or would I have to find an API which can create images and saves to say JPEGs then load them as Texture2D instances? Thanks, James ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Drawing to Texture2D
Hi James, I was wondering if it is possible to draw on a Texture2D instance. I know this isn't possible, but I am wondering if you can do the equivalent of: Texture2Dinstance-DrawCircle(x,y,r); OSG does not do 2D drawing to images. You can do your own by getting the data pointer from an osg::Image and drawing pixels into that (if you feel the need to write your own line, circle, flood-filling etc. algorithms :-) ), or you can use an imaging library (ImageMagick, etc.) to make the image and then get the data from that library and copy it into an osg::Image (or perhaps even use the same pointer if it's a raw format). No need to save the image to disk and re-read it with OSG. Hope this helps, J-S -- __ Jean-Sebastien Guay[EMAIL PROTECTED] 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] Drawing to Texture2D
Many thanks, that seems to be exactly what I am looking for. 2008/7/11 Robert Osfield [EMAIL PROTECTED]: Hi James, Perhaps a Render To Texture Camera is what you are look for. Have a look at the osgprerender example. Robert. On Fri, Jul 11, 2008 at 3:20 PM, James Dickson [EMAIL PROTECTED] wrote: Hi, I was wondering if it is possible to draw on a Texture2D instance. I know this isn't possible, but I am wondering if you can do the equivalent of: Texture2Dinstance-DrawCircle(x,y,r); Or would I have to find an API which can create images and saves to say JPEGs then load them as Texture2D instances? Thanks, James ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- James Dickson ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
