1. The Problem
   1. Gravel Hatch appeared splotchy and did not look like gravel or rocks. Rather, it appeared more like straw. 
   2. Lynsky says it is a problem with the coordinate base and very large coordinates for our drawings because originally Autocad was not designed for such large coordinates. 
   3. Then also, the problem propagated through the x-ref and even through the viewport.
2. The Solution
   1. Select your strange-looking hatch area,
   2. right-click on it and pick hatch edit (lower left-hand menu).
   3. Hatch origin can be changed by selecting "Click to set new origin" and pick new origin point on your screen (within the area you want to hatch).
   4. Then click OK and you are done.
   5. Your hatch pattern will look like you expect it to look.

Hatch Scale

1. Check out Driscoll's article http://companyweb/Lists/General%20Discussion/DispForm.aspx?ID=11&Source=http%3A%2F%2Fcompanyweb%2Fdefault%2Easpx
2. If you will create your hatch using Annotative property, it will display the same through any viewport.

Tool Palette for frequently used hatches http://companyweb/Lists/Cad%20Forum/DispForm.aspx?ID=33&Source=http%3A%2F%2Fcompanyweb%2FLists%2FCad%2520Forum%2FAllItems%2Easpx

Custom Hatch Pattern-hatches are defined using a series of starting line definitions and offsets for those lines

1. Edit hatch definitions using Word Pad
   1. C:\Documents and Settings\(login)\Application Data\Autodesk\C3D 2008\enu\Support\acad.pat
   2.  Title definition
      1. *name, description
   3. Line Definition
      1. ANGLE, START X-COORD, START Y-COORD, X-OFFSET, Y-OFFSET, LINE ON, -LINE OFF...
      2. Hints
         1. A comma separates each part of the hatch definition on a line
         2. Each line is a complete definition of hatch drawing behavior
         3. Simple hatches can have as few as one line of definition or as many as 50 lines
         4. The angle and start x and y coordinates define a relative basis for creating offset dashed lines
         5. Y-offset distance begins at the origin of that line and goes in a direction perpendicular to the defined angle.  (relative x and y)
         6. You cannot have a y-offset of zero.
         7. X-offset distance begins at the end of the y-offset distance and goes perpendicular to the right till you get to either a dash or a space
         8. Line On length is positive and line off length is negative and repeats
         9. A dot is a line of zero length
         10. you may define up to seven combinations of line on and line off for each line definition
   4. Try to edit an existing hatch until you get the knack of it to create your own custom hatch pattern.
2. I edited TRI by adding an interior triangle every other set to create CELTIC-TRI--The first three lines define exterior triangles and the last three lines define the interior triangles.
   1. *CELTIC-TRI, Equilateral triangles with arms
      60, 0,0, .1875,.324759526, .1875,-.1875
      120, 0,0, .1875,.324759526, .1875,-.1875
      0, -.09375,.162379763, .1875,.324759526, .1875,-.1875
      60, .09374998,.16237982, .56249996,.32475953, .1875,-.93750009
      120, .28124998,.1637982, .56249996,.32475953, .1875,-.93750009
      0,.09374998,.16237982,.56249996,.32475953,.1875,-.93750009