Shader入门精要 学习采坑日志

初学Shader，非常难啃，写下日志记录学习

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Unlit/LearnPath1"
{
    SubShader
    {
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

			struct a2v
			{
				float4 vertex : POSITION;
				float3 normal : NORMAL;
				float4 texcoord : TEXCOORD0;
			};

			struct v2f
			{
				float4 pos : SV_POSITION;
				fixed3 color : COLOR0;
			};

            v2f vert(a2v v) : SV_POSITION
            {
				v2f o;
				o.pos = UnityObjectToClipPos(v.vertex);
				o.color = v.normal * 0.5f + fixed3(0.5,0.5,0.5);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                return fixed4(i.color,1.0);
            }
            ENDCG
        }
    }
}

会报错

invalid output semantic 'SV_POSITION': Legal indices are in [0,0] at line 26 (on d3d11)

百度查到   v2f vert(a2v v) : SV_POSITION 去掉 : SV_POSITION 就可以了

或者这一整段改成:

void vert(in a2v v,out v2f o)
{
	o.pos=UnityObjectToClipPos(v.vertex);
	o.color=v.normal*0.5+fixed3(0.5,0.5,0.5);
}

现在不明白，记录着先