+ // Compute shadowing
+ "float shadow = 1.0 - abs(aTexCoords.y - 0.5) * 2.0;"
+ "float masking = smoothstep( 0.5, 0.8, shadow );"
+
+ "vec3 colour_comp = mix( vec3(0.0,0.0,0.0), uColour.rgb, masking );"
+
+ "float flow_thing = fract( aTexCoords.x + uTime );"
+ "vec3 final_comp = colour_comp + flow_thing * uGlow;"
+
+ "FragColor = vec4( final_comp, max( shadow* 0.2, masking ) * uColour.a );"