Hi, Paul and Michael Frist Thank you for your suggestion. I use the your method, and output show correctly in normal rendering, but when I use my deferred render, it has aliasing, I use a TextureRectangle as normal_sampler, below is my fragment shader: #version 120
uniform sampler2D normal_sampler;
varying vec3 normal;
centroid varying vec4 texcood; //texcoord is gl_Position from vertex
shader
void main()
{
//vec3 snormal = 2.0*texture2DRect(normal_sampler, gl_FragCoord.st).xyz -
vec3(1.0, 1.0, 1.0);
vec2 tex_coord = 0.5*texcood.st / texcood.w + 0.5;
vec3 snormal = 2.0*texture2D(normal_sampler, tex_coord).xyz - vec3(1.0, 1.0,
1.0);
float diffuse = dot(normalize(snormal), -1.0*gl_LightSource[0].spotDirection);
gl_FragColor = vec4(diffuse, 0.0, 0.0, 1.0);
}
I also change the filter of normal sampler to linear, it also makes the same
result.
you can also see the screen output in attachment:
Thank you!
Cheers,
Kai
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http://forum.openscenegraph.org/viewtopic.php?p=26053#26053
<<attachment: 4.png>>
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