is there a simple reflection shader for iOS? even a hacky one?

Unity Engine
1

Hi there,

I need to make an icy looking surface on iOS and I can’t seem to find a suitable shader that will give me a reflective look. I tried additively blending an image with spherical mapping but it just looks a bit weird.

I can’t seem to find any other examples of a simple reflective shader.

Any ideas?
Thanks
Pete

2

You can always use the good ol’-fashioned “duplicate and flip geometry” trick. Scaling by -1 on the y axis will do. Then use a transparent plane for the surface.

–Eric

3

If you mean reflective just supplying a reflective texture yourself, search forums, I posted on a while ago. Try searching for env mapping or environment or sphere mapping.

If you mean actually reflecting the environment then what eric suggests is a fast way to do it.

4

Thanks Guys,
I was looking for more of an overall reflective look so more like what hippocoder is talking about. Searched the forums a bit but it’s hard to find something that is relevant. I just seem to be coming up with loose ends. Is cube mapping the answer? Because the sphere mapping isn’t really working in my case.
Thanks
Pete

5

Hey guys, I ended up using this -
And it works great for what I need, but, it doesn’t seem to work with opengl es 1.1 does anyone know why that might be?
Thanks
P.

Shader "Relfective Vertex Mask" {
    Properties {
        _MainTex ("Reflection Texture", Cube) = "white" {TexGen CubeReflect}
   }   

Category {
	Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
	Blend One One
	Cull Off 
	Lighting Off 
	ZWrite Off

	SubShader {
		Pass {
			ColorMaterial AmbientAndDiffuse
			
			SetTexture [_MainTex2] {
				Combine primary
			}
			
			SetTexture [_MainTex] {
				combine texture * previous
			}
		}
	}
}
}
6

I’m not shader guru, but I think 1.1 do not support cube mapping. For 1.1 you can do it via crude scripting though, instead of sending to the GPU.

7

use sphere mapping instead for 1.1 (off the top of my head the code would look like):

Shader "Mobile/Spheremap"
{
	 Properties 
	 {
		_EnvMap ("EnvMap", 2D) = "black" { TexGen SphereMap }
	 }

	 SubShader 
	 {
	 	Lighting on
		Tags {"Queue" = "Geometry"}

		Pass 
		{ 	
			BindChannels 
			{ 
				Bind "Vertex", vertex 
				Bind "normal", normal 
			}
			Material
			{
				Diffuse [_Color]
				Ambient [_Color]
			}

			SetTexture [_EnvMap]
			{ 
				combine texture + primary 
			} 
		}
	} 
}

Untested, give it a quick spin.

Be sure to use a proper sphere map. Here’s one:

8

Thanks Hippocoder, that seems to be doing the job pretty cool.

I had to change : SetTexture [_MainTex] to SetTexture [_EnvMap]

Thanks for the help!

9

Ahh crap, spoke too soon.
For some reason the reflection looks textured on when i run it on the iPhone, it doesn’t move across the surface…
What am i doing wrong, any ideas?
This shader is driving me mad.
Pete

10

I remember that trick, evil genius used it. Great game. Oh so off topic :stuck_out_tongue:

11

I’d use that but my character is on an uneven ground and the reflective areas are in little sections so it wouldn’t really work.
Surely there must be a reflective look shader out there though, I must have seen unity games with them.

12

Looks Cool. Thanks. I Added main color to blend with reflection map. but where i can control the reflection amount. Little help would be great.