score:2
Accepted answer
you cannot achieve this effect in the fragment shader because you are rendering multiple meshes or primitives. you have to enable blending before rendering the geometry:
gl.enable(gl.blend);
gl.blendfunc(gl.src_alpha, gl.one_minus_src_alpha);
also make sure that the depth test is disabled.
additionally you must set the alpha channel from. e.g.:
gl_fragcolor = vec4(glow, 1.0);
vec4(glow, (glow.r+glow.g.+glow.b)/3.0 * 1.1 - 0.1);
Source: stackoverflow.com
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