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Rev 657 Rev 662
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    "	{\n"
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    "	{\n"
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    "       vec3 normal = normalize(_normal);\n"
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    "       vec3 normal = normalize(_normal);\n"
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    "		float dot_ln = max(0.0,dot(light_dir, normal));\n"
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    "		float dot_ln = max(0.0,dot(light_dir, normal));\n"
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    "		\n"
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    "		\n"
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    "		float s_norm = s/scalar_max;\n"
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    "		float s_norm = s/scalar_max;\n"
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    "		float stripe_signal = 10.0 * s_norm;\n"
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    "		float stripe_signal = 400.0 * s_norm;\n"
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    "		vec4 stripe_col = abs(stripe_signal) < 3.14 ? vec4(-1.0,0,0,0) : vec4(.9,.9,.9,0);\n"
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    "		vec4 stripe_col = vec4(.9,.9,.9,0);\n"
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    "		\n"
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    "		\n"
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    "		gl_FragColor = s_norm * vec4(-1,0,1,0);\n"
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    "		gl_FragColor = max(vec4(0), s_norm * vec4(-1,0,1,0));\n"
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    "       gl_FragColor *= dot_ln;\n"
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    "       gl_FragColor *= dot_ln;\n"
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    "       gl_FragColor.r = pow(gl_FragColor.r, 1.0/gamma);\n"
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    "       gl_FragColor.r = pow(gl_FragColor.r, 1.0/gamma);\n"
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    "       gl_FragColor.g = pow(gl_FragColor.g, 1.0/gamma);\n"
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    "       gl_FragColor.g = pow(gl_FragColor.g, 1.0/gamma);\n"
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    "       gl_FragColor.b = pow(gl_FragColor.b, 1.0/gamma);\n"
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    "       gl_FragColor.b = pow(gl_FragColor.b, 1.0/gamma);\n"
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    "		//gl_FragColor += stripe_col * smoothstep(0.8,1.0,cos(stripe_signal));\n"
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    "		gl_FragColor += stripe_col * pow(cos(stripe_signal),15.0);\n"
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    "	}\n";
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    "	}\n";
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    void ScalarFieldRenderer::compile_display_list(const HMesh::Manifold& m, bool smooth,
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    void ScalarFieldRenderer::compile_display_list(const HMesh::Manifold& m, bool smooth,
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                                                   HMesh::VertexAttributeVector<double>& field, double max_val, float gamma)
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                                                   HMesh::VertexAttributeVector<double>& field, double max_val, float gamma)
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    {
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    {
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        glEndList();
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        glEndList();
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        glUseProgram(old_prog);
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        glUseProgram(old_prog);
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    }
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    }
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    HMesh::VertexAttributeVector<CGLA::Vec2f> CheckerBoardRenderer::param;
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    const string CheckerBoardRenderer::vss =
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    "	attribute vec2 param;\n"
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    "	varying vec3 _normal;\n"
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    "	varying vec2 uv;\n"
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    "	\n"
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    "	void main(void)\n"
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    "	{\n"
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    "		gl_Position =  ftransform();\n"
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    "		_normal = normalize(gl_NormalMatrix * gl_Normal);\n"
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    "		uv=param;\n"
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    "	}\n";
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    const string CheckerBoardRenderer::fss =
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    "	varying vec3 _normal;\n"
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    "	varying vec2 uv;\n"
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    "   const float pi = 3.14159265359;\n"
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    "	const vec3 light_dir = vec3(0,0,1);\n"
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    "	\n"
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    "	void main()\n"
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    "	{\n"
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    "       vec3 normal = normalize(_normal);\n"
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    "		float dot_ln = max(0.0,dot(light_dir, normal));\n"
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    "		vec2 rt = uv;//vec2(length(uv),atan(uv.y, uv.x));\n"
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    "		float stripe_signal = smoothstep(-0.001,0.001,sin(2.0*pi*rt.x)*sin(10.0*rt.y));\n"
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    "		\n"
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    "		gl_FragColor = dot_ln * vec4(0.35,0.25,0.5,0);\n"
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   "		gl_FragColor.rgb += 0.7*stripe_signal;\n"
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    "	}\n";
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    void CheckerBoardRenderer::compile_display_list(const HMesh::Manifold& m, bool smooth)
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    {
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        GLint old_prog;
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        glGetIntegerv(GL_CURRENT_PROGRAM, &old_prog);
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        glUseProgram(prog);
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        GLuint param_attrib = glGetAttribLocation(prog, "param");
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        glNewList(display_list,GL_COMPILE);
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        for(FaceIDIterator f = m.faces_begin(); f != m.faces_end(); ++f){
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            if(!smooth)
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                glNormal3dv(normal(m, *f).get());
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            if(no_edges(m, *f)== 3)
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                glBegin(GL_TRIANGLES);
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            else
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                glBegin(GL_POLYGON);
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            for(Walker w = m.walker(*f); !w.full_circle(); w = w.circulate_face_ccw()){
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                Vec3d n(normal(m, w.vertex()));
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                if(smooth)
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                    glNormal3dv(n.get());
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                glVertexAttrib2fv(param_attrib, param[w.vertex()].get());
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                glVertex3dv(m.pos(w.vertex()).get());
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            }
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            glEnd();
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        }
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        glEndList();
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        glUseProgram(old_prog);
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    }
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    const string AmbientOcclusionRenderer::vss =
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    const string AmbientOcclusionRenderer::vss =
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    "	attribute float scalar;\n"
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    "	attribute float scalar;\n"
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    "	varying vec3 _normal;\n"
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    "	varying vec3 _normal;\n"