How to obtain a Glow Effect for iOS?

Hi, I would like to know what is the best way to obtain a glow effect like the following image.



I need to achieve this effect for iOS, any input on how to do it, it's appreciated.

Thanks.

 

A coarse approximation might be a semitransparent sphere with additive blending that adds no light when the surface normal is orthogonal to the view direction and more light otherwise. For the implementation a surface shader without lighting should do fine.

 

mobile bloom in angry ant does such, but not for every IOS device, I would suggest you only doing this effect ipad2, iphone4s, ipad3

 

I did a quick test to see whether my idea made any sense:

Code (csharp):

1.  
2. Shader "Custom/glow" {
3.     Properties {
4.         _Color ("Color", Color) = (1,1,1,1)
5.     }
6.     SubShader {
7.         Tags { "Queue"="Transparent" }
8.         LOD 200
9.         ZTest Always
10.         Cull Off
11.         Blend One One
12.  
13.         CGPROGRAM
14.         #pragma surface surf Lambert
15.  
16.         float4 _Color;
17.  
18.         struct Input {
19.             float3 viewDir;
20.             float3 worldNormal;
21.         };
22.  
23.         void surf (Input IN, inout SurfaceOutput o) {
24.             o.Alpha = _Color.a * pow(abs(dot(normalize(IN.viewDir),
25.                 normalize(IN.worldNormal))),4.0);
26.             o.Emission = _Color.rgb * o.Alpha;
27.         }
28.         ENDCG
29.     }
30.     FallBack "Diffuse"
31. }
32.  
33.  

Edit: Changed "RenderType" to "Queue" and changed decal blending to additive blending with "Blend One One"

 

Thanks a lot! I'm creating a lamp shader and this worked perfectly.

 

it's an old thread, but does it work with unity free?
I know all glow features are Pro only and I am not really expert in shaders...