地形地面，在《城市：天际线》中平滑过渡草地和雪地

Question

地形地面，在《城市：天际线》中平滑过渡草地和雪地

5

我正在为《城市：天际线》制作一个季节模组。我的方法还算不错，我找到了一种方法，可以通过使用HTML标签将地面纹理更改为雪地。

mat.SetTexture("_TerrainGrassDiffuse", grassTexture);

So that is working fine, but i dont want a hard cut between the seasons. So I came up with this idea: Lerping between the snow and the grass texture. Googled much, but I didn't come up with anything which works. So I want a lerp which fades in the snow texture and fades out the grass texture by a given amount of time, so I think a lerp is right here. I have no access to the shader, cause its a mod, and I would need decompiling for that.. I tried using

someMat.Lerp();

but I don't know which material I need to use for the someMat. Thanks for help!

- Johnny Verbeek

1个回答

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- MX D · Accepted Answer

首先我想指出，someMat.Lerp(); 不是你问题的解决方案。 material Lerp() 函数用于更改颜色，同时保留原始着色器和纹理。由于您希望lerp纹理，因此情况并非如此。

此外，我认为在Unity中没有内置的方法来lerp纹理。但似乎可以使用着色器来规避此问题。经过短暂的谷歌之旅，我找到了这个UnityScript解决方案source，其中包含一个简单而漂亮的着色器实现解决方案的示例。

着色器和相关代码示例也可以在下面看到。

public void Update ()
{
     changeCount = changeCount - 0.05;

     textureObject.renderer.material.SetFloat( "_Blend", changeCount );
      if(changeCount <= 0) {
           triggerChange = false;
           changeCount = 1.0;
           textureObject.renderer.material.SetTexture ("_Texture2", newTexture);
           textureObject.renderer.material.SetFloat( "_Blend", 1);
      }

 }
}

在博客中给出的示例着色器为：

。

Shader "TextureChange" {
Properties {
_Blend ("Blend", Range (0, 1) ) = 0.5 
_Color ("Main Color", Color) = (1,1,1,1)
_MainTex ("Texture 1", 2D) = "white" {}
_Texture2 ("Texture 2", 2D) = ""
_BumpMap ("Normalmap", 2D) = "bump" {}
}

SubShader {
Tags { "RenderType"="Opaque" }
LOD 300
Pass {
    SetTexture[_MainTex]
    SetTexture[_Texture2] { 
        ConstantColor (0,0,0, [_Blend]) 
        Combine texture Lerp(constant) previous
    }       
  }

 CGPROGRAM
 #pragma surface surf Lambert

sampler2D _MainTex;
sampler2D _BumpMap;
fixed4 _Color;
sampler2D _Texture2;
float _Blend;

struct Input {
    float2 uv_MainTex;
    float2 uv_BumpMap;
    float2 uv_Texture2;

};

void surf (Input IN, inout SurfaceOutput o) {
    fixed4 t1 = tex2D(_MainTex, IN.uv_MainTex) * _Color;
    fixed4 t2 = tex2D (_Texture2, IN.uv_MainTex) * _Color;

    o.Albedo = lerp(t1, t2, _Blend);
    o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
}
ENDCG  
}

FallBack "Diffuse"
}