Ouch bad link: https://github.com/openscenegraph/OpenSceneGraph/blob/master/src/osgPlugins/gles/TangentSpaceVisitor.cpp#L46
this one is the right one! 2017-11-08 9:19 GMT+01:00 Jordi Torres <jtorresfa...@gmail.com>: > Hi Romulo, > > You can use TangentSpaceGenerator to get the values of the T B and N. Here > you have a code example: https://github.com/sketchfab/osg/blob/ > 5d35b2a2d55e92b4c736ea5edcd9eeedf9ea6786/src/osgPlugins/ > gles/TangentSpaceVisitor.cpp#L46 > > Cheers. > > 2017-11-07 21:48 GMT+01:00 Rômulo Cerqueira <romulogcerque...@gmail.com>: > >> Hi, >> >> I have used normal mapping using GLSL and OSG for my application (an >> imaging sonar simulation) and I got problems by calculating the TBN matrix >> on shaders. The normal vectors contain lower resolution on border in >> comparison with the center of image. >> >> Follows my vertex code: >> >> Code: >> >> #version 130 >> >> out vec3 pos; >> out vec3 normal; >> out mat3 TBN; >> >> void main() { >> pos = (gl_ModelViewMatrix * gl_Vertex).xyz; >> normal = gl_NormalMatrix * gl_Normal.xyz; >> >> vec3 n = normalize(normal); >> vec3 t = normalize(cross(normal, vec3(-1,0,0))); >> vec3 b = cross(t, n) + cross(n, t); >> TBN = transpose(mat3(t,b,n)); >> >> gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; >> gl_TexCoord[0] = gl_MultiTexCoord0; >> } >> >> >> >> >> Part of my fragment code: >> >> Code: >> >> #version 130 >> >> in vec3 pos; >> in vec3 normal; >> in mat3 TBN; >> uniform sampler2D normalTexture; >> >> void main() { >> vec3 newNormal = (texture2D(normalTexture, gl_TexCoord[0].st).rgb * >> 2.0 - 1) * TBN; >> newNormal = normalize(newNormal); >> ... >> } >> >> >> >> >> The resulting figure is attached. >> >> How can I calculate the TBN matrix to compute the normal mapping properly? >> >> Thanks in advance, >> >> >> ... >> >> Thank you! >> >> Cheers, >> Rômulo[/img] >> >> ------------------ >> Read this topic online here: >> http://forum.openscenegraph.org/viewtopic.php?p=72324#72324 >> >> >> >> >> Attachments: >> http://forum.openscenegraph.org//files/screenshot_from_2017_ >> 11_06_23_00_48_832.png >> >> >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > > > > -- > Jordi Torres > > > -- Jordi Torres
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