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One line, repeated at a 2'-0" spacing will work for the 2'-0" offsets in the X-direction. You will need two lines in the Y-direction, repeating at a 4'-9" offset each. The origin of the second line needs to be 2'-0" in the Y-direction from the origin of the first line. See attached file.
You wanted alternating spacings of 2'-0" and 2'-9". The offset between members of the same "family" of lines is constant, so one line cannot be spaced at 2'-0" and 2'-9", so you need two parallel line definitions, with a 2'-0" separation in their origin points, that are spaced at the total of the repeating pattern, which is 2'-0" + 2'-9" = 4'-9" (57 in the PAT file).
Each line in a hatch definition represents a "family" of lines. The angle of the line is specified in the first field, then the X and Y values of the origin point are specified in the next two fields. The X offset (offset along the length of the line, regardless of angle; only has meaning for a line that has a dash pattern specified) and the Y offset (offset between members of the family, perpendicular to the direct of the line, regardless of angle) are the fourth and fifth fields. Optional fields defining pen-down segments (dashes - positive values) and pen-up segments (gaps - negative values) can follow. For an RCP grid, the lines are continuous, so there are no optional dash fields in the file I attached.
The first line definition is
0, 0,0, 0,57
This creates a horizontal line (0-degree angle) with an origin at 0,0 that has an X-offset along the length of the line of 0 (no dashes, so any number would work) and a Y-offset perpendicular to the length of the line of 57 (4'-9"), so you would get a series of lines running horizontally, 57 units apart.
The second line definition is
0, 0,24, 0,57
This creates a second horizontal line with an origin at 0,24, putting it 24 units (2'-0") away from the first line. Like the first line, it is continuous, so the X-offset is meaningless and set to 0; the Y-offset is 57 (4'-9"), so this creates a second series of lines that are 57 units apart and 24 units (2'-0") from the previous line of the first line definition and 33 units (2'-9") from the following line of the first defintion line, creating the alternating 2-0" and 2'-9" spacing.
The third line defintion is
90, 0,0, 0,24
Since the spacing of the pattern in the other direction is a constant 2'-0", one line is all that is needed. The angle is 90, making it a vertical line, with an origin at 0,0. There is no X-offset along the length of the line, but there is a Y-offset perpendicular between lines of the same family of 24 units (2'-0").
You will need four horizontal lines. The angle for each of these four lines is 0, so the first number of each line is 0. The origin points for each line will have an X value of 0 (second number) and Y values of 0, 30, 60 and 78 respectively. The lines are continuous, so the fourth number does not matter and is set to 0. The total pattern length is 9'-0" (108), so the fifth number for each of those lines would be 108. You did not specify, so I assume that in the vertical direction, you wanted lines spaced at 2'-0" (24). Here are the lines in the hatch definition:
0, 0,0, 0,108
0, 0,30, 0,108
0, 0,60, 0,108
0, 0,78, 0,108
90, 0,0, 0,24
See the attached file.
If your pattern just alternates 24" and 30" spacings in both directions, then
0, 0,0, 0,54
0, 0,24, 0,54
90, 0,0, 0,54
90, 24,0, 0,54
for the line definitions should be sufficient. Your pattern works, but has two extra lines in each direction that are not needed.
There are no extra ceiling grid lines generated by your pattern; there are just extra lines being defined in your pattern. Your pattern repeats every 54" in both directions. My pattern defines two lines in each direction, each offset 54". You set up your pattern with a 108" repeat, so you needed to define two extra lines in each direction.
Same end result, just with more lines to code and track in the hatch pattern definition.
Apologies for the delayed response; I am a bit behind in my reading of this forum. In the future, use an "@" mention as I did above to send that person a notification email calling attention to your post. I m not in front of Revit right now to test this, but I believe that switching the 0 and 25 as shown below should give you the pattern you want. You may have already worked that out by now.
*Custom Ceiling
;%TYPE=MODEL
00, 0,0, 0,83
00, 0,36, 0,83
90, 0,0, 0,72
90, 25,0, 0,72
Hi @David_W_Koch,
I'm currently working on a ceiling grid pattern that has 2 parallel 2'x6' with a 1'x4' grid perpendicular to it.
I tried to wrap my head around the discussions but I think the solution to mine can be somewhat similar but more complicated as it is. Can you help me with this, please? I attached an image of what I'm trying to achieve.
Thanks.
Try this:
;%VERSION=3.0 ;%UNITS=INCH *ClgGrid_2x6_1x4, Grid with stacked 2'x6' panels alternating with 1'x4' panels ;%TYPE=MODEL 0, 0,0, 0,48 0, 0,24, 0,48, 72,-12 90, 0,0, 0,84 90, 72,0, 0,84
Use Notepad to save that to a file called ClgGrid_2x6_1x4.pat (make certain the extension is pat, and not txt). If you would prefer a different name, change ClgGrid_2x6_1x4 in the text above to your preferred name and use that as the name of your file (with a pat extension).
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