I want to make an object invisible and learn something about tex2dProj.I dont have any good documents,but try the codes. Code (csharp): v2f vert (appdata_t v) { v2f o; o.vertex = mul(UNITY_MATRIX_MVP, v.vertex); o.color = v.color; o.texcoord = v.texcoord; o.screenPos = ComputeScreenPos(o.vertex); //o.worldPos = TRANSFORM_TEX(v.vertex.xy, _MainTex); return o; } sampler2D _GrabTexture; half4 frag (v2f IN) : COLOR { half4 originCol = tex2Dproj(_GrabTexture,IN.screenPos); half4 completedColor = originCol; /[CODE] these codes does not work.... anyone fixes it?