   please help me fix my grass
  Hi,i'm trying to implement the technique described in"Toward Photorealism in Virtual Botany" http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter01.htmli got it working pretty good so far except that the distanced billboard dont seem to face muchand when i look at it from the other side, some weird path is cut through the grasshere's the vertex shader code:VSGrassPS20 output;float3 CamPosWorld = MatViewInv[3].xyz;float3 center = mul(position, xWorld);  float3 Look = CamPosWorld - center;  Look = normalize( Look );  float3 Right = cross( float3( 0.0, 1.0, 0.0 ), Look );  float3 Up = cross( Look, Right );  Right = normalize( Right );  Up = normalize( Up );output.oPosition = mul(position, viewProjMatrix) + float4(inTex2.x * Right, 0.0) + float4(inTex2.y * Up, 0.0);output.oText = inTex;inTex2 stores this stuff: 
  another screen showing the weird behavior:;  in the gpu gems article they sayOut.Pos = Input.inPos + (Input.inTexCoord2.x * RightVector) +    (Input.inTexCoord2.y * UpVector);but that only attached a big grass clump to me :/   ;  omg i fixed itLast line should be    output.oPosition =  mul(position + float4(inTex2.x * vRight,0.0) +    float4(inTex2.y * vUp, 0.0), viewProjMatrix);thanks yall!   