Hi Juan, +0.5 did the trick! Anyway I will make tests with texelFetch1D and TBO's looking for a better performance. Thank you for the tips.
Muchas gracias!! 2010/9/23 Juan Hernando <[email protected]> > Hi Jordi, > I think the problem is in this line of code in your vertex shader: > > vec4 pos= gl_Vertex+ > vec4(texture1D(texturePos,(float(gl_InstanceID)/nInstances)).xyz,0.); > > I think that texels are placed in the [0..1] range using their centers and > not the left edge as your code assumes. That means that if you have to > texels they are not placed at 0 and 0.5 or 0 and 1 but 0.25 and 0.75. It's > difficut to assure what happens in 0.5. In short, the nearest texel may not > be the one you are expecting (only with two images, my guess is that the 9th > square overdraws the 8th). If your hardware supports it, use texelFetch1D, > which admits integer coordinates. Maybe adding 0.5 to gl_InstanceID can also > do the job. > > Finally, remember that 1D textures are limited to 8192 texels in current > hardware (at least mine). You'll need a Texture Buffer Object if you need > more. > > Regards, > Juan > > Jordi Torres wrote: > >> Hi all, >> >> I am trying to show instanced geometry using a texture1D like a vertex >> buffer. In fact I have it working more or less... but if my Texture 1D is >> non power of two then my shader does not render some of the instances. >> Attached is the code and two images, one with a non power of two texture(9 >> elements) that fails to draw last element, and other with 256 elements >> that >> is drawn correctly. >> >> I am using TransferFunction1D to pass my geometry array to a texture1D. >> Anybody knows what I'm doing wrong? Of course I have set >> texture->setResizeNonPowerOfTwoHint(false); >> >> Thank you in advance! >> >> Jordi. >> >> > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- Jordi Torres Fabra gvSIG 3D blog http://gvsig3d.blogspot.com Instituto de Automática e Informática Industrial http://www.ai2.upv.es
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