Hi Christian, A short comment before looking at any of the code ( can't open the zip ).
>From the snippets you posted, it looks to me like the texture coordinates used for textureUnit 0 are not correct. If they are set with the geometry ( per vertex ), then the first part should work well, if they are either object-relative or eye-relative with a TexGen to calculate them, that requires some calculations in the vertex shader ( that are done automatically by the fixed-function pipeline ). Looking even more closely, I can see you are rendering to a single quad ( z values are 0 ), and the last line scales everything in the [0.0,1.0] range, from the usual [-1.0,1.0], something that is done with projective texturing ( see osgshadow example for the way _texGen is being scaled ). I think the only reason your second snippet is working is because you are using an identity matrix for the camera, if you were using anything else, your results would probably be off. summary: check the texture coordinates for the pass you are referring to :) Cheers Mihai Christian Heine wrote: > Hello, > > 2nd issue (Shader): > If i use in the vertex shader the values of the rendering pipeline with > the following > setups, the RTT result is shown like in the working screenshot. The blur > effect > of the second pass is not effected but the shader executed (set color to > red): > > gl_Position = ftransform(); > vTexCoord = gl_MultiTexCoord0; > > If i use this simple code sniplet (used in RenderMonkey for Shadertest) > then the > RTT is moved to screen center and sized up where nothing is shown (See > defect_vertexShader > Screenshot): > > vec2 Position; > Position.xy = sign(gl_Vertex.xy); > > gl_Position = vec4(Position.xy, 0.0, 1.0); > vTexCoord = Position.xy *.5 + .5; > > I couldn't be explain, why this simple snipplet occurs in such an > effect. There is > nothing special done ... > > Thanks for any help, > best regards > Chris > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
