" if( uIsoAmt > 0.0 ){\n"
" float height = fract( aCo.y * 0.1 );\n"
" float lg = 2.0*length(vec2(dFdx(height), dFdy(height)));\n"
-" vfrag *= 1.0f+(lg*0.4*uIsoAmt);\n"
+" vfrag *= 1.0f+(lg*0.2*uIsoAmt);\n"
" }\n"
"\n"
-"\n"
" oColour = vec4( vfrag, 1.0 );\n"
" //oColour = vec4( vfrag, 1.0 );\n"
"}\n"