[Mitchell]

after 5 seconds, and several hours after i found a solution, it returns these contents when you look at water on the ground: 256, but 1 if there is something in the way.

PHP Code:

public Action:GetEnd(client, args)
{
    new Float:vAngles[3], Float:vOrigin[3], Float:pos[3];

    GetClientEyePosition(client, vOrigin);
    GetClientEyeAngles(client, vAngles);

    new Handle:trace = TR_TraceRayFilterEx(vOrigin, vAngles, MASK_WATER, RayType_Infinite, TraceASDF);

    if(TR_DidHit(trace))
    {
        TR_GetEndPosition(pos, trace);
        if(TR_GetPointContents(pos) != 1)
        {
            PrintToChat(client, "Hit water! :D");
        }
    }
    CloseHandle(trace);

    return Plugin_Handled;
}