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  float stripe_signal = 100 * eig_norm;
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  float stripe_signal = 100 * eig_norm;
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  vec4 stripe_col = abs(stripe_signal) < 3.14 ? vec4(1,1,0,0) : vec4(.1,.1,.1,0);
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  vec4 stripe_col = abs(stripe_signal) < 3.14 ? vec4(1,1,0,0) : vec4(.1,.1,.1,0);
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  gl_FragColor = eig_norm * vec4(-1,0,1,0);
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  gl_FragColor = eig_norm * vec4(-1,0,1,0);
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  if(do_diffuse)   gl_FragColor *= dot_ln;
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  if(do_diffuse)   gl_FragColor *= dot_ln;
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  if(do_highlight) gl_FragColor += pow(dot_ln,10)*vec4(.5,.5,.5,0);
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  if(do_highlight) gl_FragColor += dot_ln*dot_ln*dot_ln*dot_ln*dot_ln*dot_ln*dot_ln*vec4(.5,.5,.5,0);
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  gl_FragColor += stripe_col * smoothstep(0.8,1,cos(stripe_signal));
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  gl_FragColor += stripe_col * smoothstep(0.8,1.0,cos(stripe_signal));
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}
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}
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/*/
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/*/
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void main()
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void main()
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{
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{