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    "		gl_FragColor = max(vec4(0), 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 * pow(cos(stripe_signal),35.0);\n"
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    "		gl_FragColor += 0.2*stripe_col * pow(cos(stripe_signal),70.0);\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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    {