关于Shader的学习记录

                float4 _EmissiveColor;
	        float4 _AmbientColor;
	        float _MySliderValue;
void surf (Input IN, inout SurfaceOutput o) {
			// Albedo comes from a texture tinted by color
			float4 c;
			c = pow((_EmissiveColor + _AmbientColor), _MySliderValue);
			o.Albedo = c.rgb;
			// Metallic and smoothness come from slider variables

			o.Alpha = c.a;

1.如果没注意将_MySliderValue的数据类型声明成float4，那么shader将不会起作用并且不会报错。

CGPROGRAM
			#pragma surface surf BasicDiffuse

		inline float4 LightingBasicDiffuse(SurfaceOutput s,fixed3 lightDir, fixed atten)
	{
		float difLight = max(0, dot(s.Normal, lightDir));
		float4 col;
		col.rgb = s.Albedo * _LightColor0.rgb * (difLight * atten * 2);
		col.a = s.Alpha;
		return col;
	}

2.自建光照模型 定义要在#下

<1> 疑问：关于rgb的运算方式，是如何进行运算得出颜色值的，0,1对它的运算影响。

3. 报错Too many texture interpolators would be used for ForwardBase pass at line

错误原因是在报错Shader里，在结构体Input中定义了大于等于3个的额外的uv变量信息。？

struct Input {
            float2 offset1;
            float2 offset2;
            float2 offset3;
            float4 pos;
            fixed4 color;
        };

<2> shader入门资料

http://www.360doc.com/content/13/0923/15/12282510_316492286.shtml