Unity Shaders and Effects Cookbook (7-3) blend with vertex colors in the terrain

One of the most common scenarios for using vertex information is to create a more realistic terrain or environment that is blended into different textures by using an RGBA channel that uses vertex colors. This way, you don't have to import a map as a mixed map.

Create a new scene and import a flat mesh model with the book.

New material, new shader. Select shader in the material and assign the material to the model.

The shader code is as follows:

Shader "Cookbookshaders/chapt7-3/vertexheightmapblend" {Properties {_maintex ("Base (RGB)", 2D) = "White" {}_secondtex ( "Second Texture", 2D) = "White" {}_heightmap ("Heightmap", 2D) = "White" {}_value ("Value", Range (1,20)) =3}subshader {Tags { "Rendertype" = "Opaque"}lod 200cgprogram#pragma surface surf Lambert vertex:vertsampler2d _maintex;sampler2d _secondtex ; sampler2d _heightmap;float _value;struct Input {float2 uv_maintex;float2 uv_secondtex;float3 vertexcolor;}; void Vert (inout appdata_full v,out Input o) {unity_initialize_output (input,o); O.vertexcolor=v.color.rgb;} void Surf (Input in, InOut surfaceoutput o) {half4 firstcolor=tex2d (_maintex,in.uv_maintex); Half4 secondcolor=tex2d (_ Secondtex,in.uv_secondtex); float4 heightcolor=tex2d (_heightmap,in.uv_maintex); float redchannel=1- IN.VERTEXCOLOR.R; The vertex color R also stores the height data, 1 minus the height data stored in the height graph is the ratio of float RHEIGHT=HEIGHTCOLOR.R * REDCHANNEL; The r actual data of the height graph float invertheight=1-heightcolor.r;float finalheight= (invertheight * redchannel) *4;float finalBlend= Saturate (rheight + finalheight);//calculates vertex mix attenuation values, which allows us to add more level of detail to the blend texture float hardness= ((1-IN.VERTEXCOLOR.G) * _value) +1;finalblend=pow ( finalblend,hardness);//Finalblend as the coefficient of linear interpolation float3 finalcolor=lerp (firstcolor,secondcolor,finalblend); Albedo=finalcolor;o. ALPHA=FIRSTCOLOR.A;} ENDCG} FallBack "Diffuse"}

transfer from http://www.thisisgame.com.cn Http://blog.csdn.net/huutu

Effect:

Principle:

Originally, we should have a picture store used to do mixed data, but more than one picture needs more system resources to handle. Since there are color data in the vertex data, we can brush the data to the top color when we do the model, saving this picture.

Sample Project Download

http://pan.baidu.com/s/1bpfrk9h

Unity Shaders and Effects Cookbook (7-3) blend with vertex colors in the terrain