关于如何使用cg中的discard/clip

Pass {

ZTest Always

Cull Off

ZWrite Off

Fog { Mode off }

Blend Off

CGPROGRAM

#pragma vertex vert_img

#pragma fragment frag

#pragma fragmentoption ARB_precision_hint_fastest

#include "UnityCG.cginc"

float4 frag (v2f_img i) : COLOR

{

//Never render the proxy shader in scene

//Just use it for shader replace

clip( -1.0 );//或者discard;

return float4( 1.0, 0.0, 0.0, 1.0 );//但是一定要返回一个值，否则报错

}

ENDCG

}