Chikanut

float2 WorldToScreenPos(float3 pos){
    pos = normalize(pos - _WorldSpaceCameraPos)*(_ProjectionParams.y + (_ProjectionParams.z - _ProjectionParams.y))+_WorldSpaceCameraPos;
    float2 uv =0;
    float3 toCam = mul(unity_WorldToCamera, pos);
    float camPosZ = toCam.z;
    float height = 2 * camPosZ / unity_CameraProjection._m11;
    float width = _ScreenParams.x / _ScreenParams.y * height;
    uv.x = (toCam.x + width / 2)/width;
    uv.y = (toCam.y + height / 2)/width;
    return uv;