How to mask render texture

Hi
I have a render texture assigned to a raw image in my UI.
I'm applying a mask to this raw image but it's just not working. I'm sure that mask setup is correct.
Can anyone tell me how to solve this issue?
Thanks
Amin

 

you have to use a shader that does the masking

 

I'm not familiar with shaders. Is there any suitable tutorial link for this?
Thanks

 

just google masked unity shader

think this one should be suitable...

http://wiki.unity3d.com/index.php?title=Texture_Mask

 

Thanks.
I searched a lot and got this shader for masking:

Shader "MaskedTexture"
{
Properties
{
_MainTex ("Base (RGB)", 2D) = "white" {}
_Mask ("Culling Mask", 2D) = "white" {}
}
SubShader
{
Tags {"Queue"="Transparent"}
Lighting Off
ZWrite Off
Blend SrcAlpha OneMinusSrcAlpha
Pass
{
SetTexture [_Mask] {combine texture}
SetTexture [_MainTex] {combine texture, previous}
}
}
}

I'm using a simple mask with a circle in the center to filer everything around the circle.

It's strange but as you can see, in the result it seems that final material has a little transparency in the central circle. Anyone know how to solve that?

 

Try turning off ZTest or change Blend property

 

Thanks.

 

In the render texture, try to change "Depth Buffer" to "At least 24 bits depth (with stencil)"