Unity Ugui rawimage Rendering Small maps

when making a similar RPG game, you may need to display a small map. One way to make a small map is to use another camera to render to a texture and display it in real time to the UI interface. Take the Unity 5.0 UI system as an example: Place a camera directly above the map, set its culling Mask, such as: Ground (ground), Minimapsign (player Monster logo), create a Render Texture, Target TextureThe properties point to this texture picture as shown in:
Create a UI panel because the small map here is intended to be made into a circle, using MaskComponent and a mask image can achieve this effect. For example, add rawimage to the mask image, add a mask component as shown in the Mapmask object:
The Rawimage object under it is used to draw a small map texture and TextureThe properties point to the small map texture picture, as shown in:
The effect is as follows:

But when the water effect is used in the scene, the water is not drawn to the small map, as shown in:
But the texture generated by the camera is drawn, as shown in:
Then there should be an error when drawing to the UI. View the default Shader used by the UI and discover that it uses a hybridBlend Srcalpha Oneminussrcalpha, it may be because the water portion of the original image has an alpha channel of 0, which makes the alpha blend transparent. The water material is Horizon ColorOf AlphaThe value is changed to 255, as shown in:
The final effect looks like this:

In addition, use MaskAlthough the components are relatively convenient, but not smooth enough, can also write Shader to implement the Mask function, the specific content of Ui-default.shaderMake a copy slightly modified, named Maskshader.shader, the contents are as follows: Shader Code

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Shader "Uiex/default-mask" { Properties { [Perrendererdata] _maintex ("Sprite Texture", 2D) = "White" {} _mask ("Mask Texture", 2D) = "White" {} _color ("Tint", Color) = (1,1,1,1) _stencilcomp ("Stencil Comparison", Float) = 8 _stencil ("Stencil ID", Float) = 0 _stencilop ("stencil operation", Float) = 0 _stencilwritemask ("Stencil Write Mask", Float) = 255 _stencilreadmask ("Stencil Read Mask", Float) = 255 _colormask ("Color Mask", Float) = 15 } Subshader { Tags { "Queue" = "Transparent" "Ignoreprojector" = "True" "Rendertype" = "Transparent" "Previewtype" = "Plane" "Canusespriteatlas" = "True" } Stencil { Ref [_stencil] Comp [_stencilcomp] Pass [_stencilop] Readmask [_stencilreadmask] Writemask [_stencilwritemask] } Cull OFF Lighting OFF Zwrite OFF ZTest [Unity_guiztestmode] Blend Srcalpha Oneminussrcalpha Colormask [_colormask] Pass { Cgprogram #pragma vertex vert #pragma fragment Frag #include "Unitycg.cginc" struct appdata_t { FLOAT4 vertex:position; FLOAT4 Color:color; FLOAT2 texcoord:texcoord0; }; struct V2F { FLOAT4 vertex:sv_position; Fixed4 Color:color; Half2 texcoord:texcoord0; }; Fixed4 _color; v2f Vert (appdata_t in) { V2F out; Out.vertex = Mul (UNITY_MATRIX_MVP, In.vertex); Out.texcoord = In.texcoord; #ifdef Unity_half_texel_offset OUT.vertex.xy + = (_screenparams.zw-1.0) *float2 ( -1,1); #endif Out.color = In.color * _COLOR; return out; } Sampler2d _maintex; sampler2d _mask; Fixed4 Frag (v2f in): Sv_target { Half4 color = tex2d (_maintex, In.texcoord) * IN.COLOR; Clip (color.a-0.01); Half4 Color2 = tex2d (_mask, In.texcoord); Return Fixed4 (COLOR.R, COLOR.G, Color.b, COLOR2.R); } Endcg } } }

Create the material, set it to this shader, and set its mask picture as shown:
Sets the properties of the small map Raw Image component, which MaterialPoint to this material, as shown in:
The final results are compared as follows:

Unity Ugui rawimage Rendering Small maps