Hatch Pattern Confusion

[Tiger]

Yo!

 

I have an issue with hatches, so I found the ACAD.pat-file and opened it up and the pattern in question looks like this:

 

;-ANSI35-S=1.0000-A=0.0000
*ANSI35, ANSI Fire brick
45, 0,0, 0,.25
45, .176776695,0, 0,.25, .3125,-.0625,0,-.0625

 

My question is the first line that is preceeded with the ; - as far as I know, a ; means that the row is not read by the program, is that correct?

 

If so (or if not) what does that row mean/indicate?

 

TIA!

[Tiger]

I will add a second question here, related to the first one:

 

There is a difference between the ACAD.pat and the ACADISO.pat - basically all the patterns in ACADISO.pat is 25.4 times larger.

ACADISO.pat:
*ANSI35,ANSI Fire brick, Refractory material
45, 0, 0, 0, 6.35 
45, 4.49013, 0, 0, 6.35, 7.9375, -1.5875, 0, -1.5875
ACAD.pat
*ANSI35, ANSI Fire brick, Refractory material
45, 0,0, 0,.25
45, .176776695,0, 0,.25, .3125,-.0625,0,-.0625

 

If I start with an ACAD.dwt I use the ACAD.pat and if I start with an ACADISO.dwt, I use the ACADISO.pat - so far so good, and I have verified that this is indeed the case.

 

So, it should be that a 2x2 hatch in ACAD.dwt with scale 1 should look the same as a 2x2 hatch in ACADISO.dwt with the same pattern, since the change between Imperial and Metric is taken care of in the PAT-file. I have feet in ACAD.dwt and Meters in ACADISO.dwt - though it doesn't matter if I have unitless, it still looks the same

 

Sadly, this is not the case here. I have to set the scale in ACADISO.dwt to 0.039 (1/25.4) for them to look the same. SO where is the issue??

[steven-g]

First post - has someone been playing with your .pat file because that line isn't in my files (but I'm LT) it could be a program error, or at somepoint it became altered.

 

Second post the difference is probably so that a 2"x2" and a 50x50 mm square will have the same appearance.

[Tiger]

Yes, someone has definatly screwed with the PAT-file, luckily it is not mine so I can easily replace it with a correct one from my machine - I am more curious to why it is there and what it does.

 

oh.... yeah... now it makes sense. ofcourse. 2 feet in one file and 2 meters in the other is not really the same thing is it...

[Tiger]

Hold it...

 

The pattern doesn't change if the square changes size??

[steven-g]

It doesn't do anything, it isn't even a line that would make any sense if it wasn't commented out, maybe someone had a couple of files open at some point and pasted accidently into the wrong one, doe's the date on the file give any clues.

[steven-g]

Hold it...

 

The pattern doesn't change if the square changes size??

Start again. Open 2 new files draw a 2x2 square in one and a 50x50 in the other and then compare them at full screen

[Tiger]

Every pattern-section in the crazy file has a preceeding line that looks exactly the same as the one I wrote previously.

 

Start again. Open 2 new files draw a 2x2 square in one and a 50x50 in the other and then compare them at full screen

 

Ah yeah, NOW it makes sense - 2 units in one is not the same as 2 units in the other.

 

Now to explain this to the clien - and present a solution.

[steven-g]

Forget the units If you draw something at full size that you can hold in your hand, and you print it at full size, it stands to reason that if someone draws it using either a metric or an Imperial measurement, then when printed you have the same number of hatch lines on your piece of paper

[Tiger]

Forget the units If you draw something at full size that you can hold in your hand, and you print it at full size, it stands to reason that if someone draws it using either a metric or an Imperial measurement, then when printed you have the same number of hatch lines on your piece of paper

 

Dang. I should have written that, that actually made sense

[BIGAL]

I posted the other day a new NET hatch I set that to be a unit of 1 so a 50x50mm would use a scale of 50, a 2"x2" would use the same pattern but be a scale of 2 because you are unitless.

 

this would give .125 grid spacing

*NET, Horizontal / vertical grid

0, 0,0, 0,.125

90, 0,0, 0,.125

 

this is mm

*NET, Horizontal / vertical grid

0, 0,0, 0,1

90, 0,0, 0,1

 

this is mm but units as metres but scale as mm

*NET, Horizontal / vertical grid

0, 0,0, 0,0.001

90, 0,0, 0,.001