Re: [osg-users] Background image texture rescaling problem
Robert Osfield wrote: Hi John, On 9/15/07, John Steinbis [EMAIL PROTECTED] wrote: Thanks Robert, I have this working now without rescaling the image. My solution was to pad the image with zeros making it a power of two and then specify the correct percentage of the image to use as 2D texture. Not sure if this is the best solution but it works and is fast enough for me. This is not an elegant way to tackle the problem, workable yes, but I'd recommend spending a little time - readying up about TextureRectangle or just disabling the resize of non power of two textures, you'll end up with a more efficient and elegant solution. I've used two of these methods to avoid the resizing penalty. The first was to use John's solution to create power-of-two images and only fill it with a subimage that is actually used. I then use the texture matrix to change the texture coordinates so no recoding is necessary. This has worked very well for my application. The second method was to use the TextureRectangle solution, but there are a few drawbacks to this method: it may not be hardware-accelerated, especially on older cards; you lose the ability to generate mipmapped textures; and your texture coordinates become non-normalized, so that you have to know the size of the image when you set up your scene if you do anything fancy. Texture Rectangles are useful but are not the ultimate solution to all problems. Eric ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Background image texture rescaling problem
Thanks Robert, I have this working now without rescaling the image. My solution was to pad the image with zeros making it a power of two and then specify the correct percentage of the image to use as 2D texture. Not sure if this is the best solution but it works and is fast enough for me. -- John On 9/13/07, Robert Osfield [EMAIL PROTECTED] wrote: Hi John, The rescaling is done on non power of two textures by default, rescaling is slow op so best avoided. You have two choices to disable the resize of the non power of two texture as you have down to move to using TextureRectangle instead of Texture2D. If moving to the TextureRectangle you'll need to move you pixel coords rather than normal non dimensions texture coords - see osgtexturerectangle example. Robert. On 9/12/07, John Steinbis [EMAIL PROTECTED] wrote: For an AR project, I need to render a model with video image as background. My program is based around osgViewer using osg v2.0. I found an example for a HUD and with a few changes made it work as background. The code can be found below. The code runs ok but there is a problem occurring that I cannot figure out. Any ideas … ? When new images are loaded, they are rescaled for some reason. This adds a noticeable delay, ~250 ms, and distorts the images, which is not acceptable. Output looks like Scaling image 'x' from (720,480) to (512,512). To prevent resizing I use BGTexture-setResizeNonPowerOfTwoHint(false). To update an image I use BGTexture-setImage(newImg). Thanks, John root-addChild(BGProjectionMatrix); BGProjectionMatrix-setMatrix(osg::Matrix::ortho2D(0,width,0,height)); BGProjectionMatrix-addChild(BGModelViewMatrix); BGModelViewMatrix-setMatrix(osg::Matrix::identity()); BGModelViewMatrix-setReferenceFrame(osg::Transform::ABSOLUTE_RF); BGModelViewMatrix-addChild( BGGeode ); BGTexture-setDataVariance(osg::Object::DYNAMIC); BGTexture-setResizeNonPowerOfTwoHint(false); // -- BGTexture-setImage(BGImage); BGGeode-addDrawable(BGBackgroundGeometry); BGGeode-setStateSet(BGStateSet); BGBackgroundVertices-push_back( osg::Vec3( 0, 0, 0) ); BGBackgroundVertices-push_back( osg::Vec3(width, 0, 0) ); BGBackgroundVertices-push_back( osg::Vec3(width, height, 0) ); BGBackgroundVertices-push_back( osg::Vec3( 0, height, 0) ); (*texcoords)[0].set(0.0f,0.0f); (*texcoords)[1].set(1.0f,0.0f); (*texcoords)[2].set(1.0f,1.0f); (*texcoords)[3].set(0.0f,1.0f); BGcolors-push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f)); BGnormals-push_back(osg::Vec3(1.0f,1.0f,1.0f)); BGBackgroundGeometry-setTexCoordArray(0,texcoords); BGBackgroundGeometry-setColorArray(BGcolors); BGBackgroundGeometry-setColorBinding(osg::Geometry::BIND_OVERALL); BGBackgroundGeometry-setNormalArray(BGnormals); BGBackgroundGeometry-setNormalBinding(osg::Geometry::BIND_OVERALL); BGBackgroundGeometry-addPrimitiveSet(BGBackgroundIndices); BGBackgroundGeometry-setVertexArray(BGBackgroundVertices); BGBackgroundIndices-push_back(0); BGBackgroundIndices-push_back(1); BGBackgroundIndices-push_back(2); BGBackgroundIndices-push_back(3); BGStateSet-setTextureAttributeAndModes(0,BGTexture,osg::StateAttribute::ON); BGStateSet-setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF); BGStateSet-setRenderingHint( osg::StateSet::TRANSPARENT_BIN ); BGStateSet-setRenderBinDetails( 1, RenderBin); ___ 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 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Background image texture rescaling problem
Hi John, On 9/15/07, John Steinbis [EMAIL PROTECTED] wrote: Thanks Robert, I have this working now without rescaling the image. My solution was to pad the image with zeros making it a power of two and then specify the correct percentage of the image to use as 2D texture. Not sure if this is the best solution but it works and is fast enough for me. This is not an elegant way to tackle the problem, workable yes, but I'd recommend spending a little time - readying up about TextureRectangle or just disabling the resize of non power of two textures, you'll end up with a more efficient and elegant solution. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Background image texture rescaling problem
I tryed disabling the resize of non power of two textures by using setResizeNonPowerOfTwoHint but it did not seem to have any effect. Do you think there is a bug or I just wasnt doing something right? You can find the line where I tried this in my original post. I havent been able to figure out how to set the position of a window. How can I do this? Also, if I try to drag the window to a new location, it freezes. -- js On 9/15/07, Robert Osfield [EMAIL PROTECTED] wrote: Hi John, On 9/15/07, John Steinbis [EMAIL PROTECTED] wrote: Thanks Robert, I have this working now without rescaling the image. My solution was to pad the image with zeros making it a power of two and then specify the correct percentage of the image to use as 2D texture. Not sure if this is the best solution but it works and is fast enough for me. This is not an elegant way to tackle the problem, workable yes, but I'd recommend spending a little time - readying up about TextureRectangle or just disabling the resize of non power of two textures, you'll end up with a more efficient and elegant solution. Robert. ___ 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] Background image texture rescaling problem
On 9/15/07, John Steinbis [EMAIL PROTECTED] wrote: I tryed disabling the resize of non power of two textures by using setResizeNonPowerOfTwoHint but it did not seem to have any effect. Do you think there is a bug or I just wasnt doing something right? You can find the line where I tried this in my original post. It'll only work if you have capable hardware - i.e. Gefore6 series or later, otherwise it'll detect this an resize things as usual. I havent been able to figure out how to set the position of a window. How can I do this? Also, if I try to drag the window to a new location, it freezes. We'll if you want to ask this, then start a new thread. Also in the meantime look at the osgwindow example. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Background image texture rescaling problem
For an AR project, I need to render a model with video image as background. My program is based around osgViewer using osg v2.0. I found an example for a HUD and with a few changes made it work as background. The code can be found below. The code runs ok but there is a problem occurring that I cannot figure out. Any ideas … ? When new images are loaded, they are rescaled for some reason. This adds a noticeable delay, ~250 ms, and distorts the images, which is not acceptable. Output looks like Scaling image 'x' from (720,480) to (512,512). To prevent resizing I use BGTexture-setResizeNonPowerOfTwoHint(false). To update an image I use BGTexture-setImage(newImg). Thanks, John root-addChild(BGProjectionMatrix); BGProjectionMatrix-setMatrix(osg::Matrix::ortho2D(0,width,0,height)); BGProjectionMatrix-addChild(BGModelViewMatrix); BGModelViewMatrix-setMatrix(osg::Matrix::identity()); BGModelViewMatrix-setReferenceFrame(osg::Transform::ABSOLUTE_RF); BGModelViewMatrix-addChild( BGGeode ); BGTexture-setDataVariance(osg::Object::DYNAMIC); BGTexture-setResizeNonPowerOfTwoHint(false); // -- BGTexture-setImage(BGImage); BGGeode-addDrawable(BGBackgroundGeometry); BGGeode-setStateSet(BGStateSet); BGBackgroundVertices-push_back( osg::Vec3( 0, 0, 0) ); BGBackgroundVertices-push_back( osg::Vec3(width, 0, 0) ); BGBackgroundVertices-push_back( osg::Vec3(width, height, 0) ); BGBackgroundVertices-push_back( osg::Vec3( 0, height, 0) ); (*texcoords)[0].set(0.0f,0.0f); (*texcoords)[1].set(1.0f,0.0f); (*texcoords)[2].set(1.0f,1.0f); (*texcoords)[3].set(0.0f,1.0f); BGcolors-push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f)); BGnormals-push_back(osg::Vec3(1.0f,1.0f,1.0f)); BGBackgroundGeometry-setTexCoordArray(0,texcoords); BGBackgroundGeometry-setColorArray(BGcolors); BGBackgroundGeometry-setColorBinding(osg::Geometry::BIND_OVERALL); BGBackgroundGeometry-setNormalArray(BGnormals); BGBackgroundGeometry-setNormalBinding(osg::Geometry::BIND_OVERALL); BGBackgroundGeometry-addPrimitiveSet(BGBackgroundIndices); BGBackgroundGeometry-setVertexArray(BGBackgroundVertices); BGBackgroundIndices-push_back(0); BGBackgroundIndices-push_back(1); BGBackgroundIndices-push_back(2); BGBackgroundIndices-push_back(3); BGStateSet-setTextureAttributeAndModes(0,BGTexture,osg::StateAttribute::ON); BGStateSet-setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF); BGStateSet-setRenderingHint( osg::StateSet::TRANSPARENT_BIN ); BGStateSet-setRenderBinDetails( 1, RenderBin); ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
