Hatch Pattern Flagstone - Gives Wierd Results

[irneb]

Here's something weird. Try the attached custom hatch, it's got one line that doesn't draw correctly - unless you change the hatch origin to something else than 0,0.

[Richard McDonald]

If your hatch is a long way away from the origin strange things can happen.

What version cad are you using?

I think from 2005 you can select different origins for the hatch to use in the hatch dialogue box.

If your before that and need to keep your UCS moving you snapbase close to your hatch should sort the problem

[irneb]

I'm using 2008, but the same happens on some 2005, 6 & 7 machines here. I think you've hit the nail on the head about long distance away from origin - we're drawing in Metric millimetres, thus a building is generally measured in hundreds of thousands (or more).

[Richard McDonald]

Try looking at this (http://forums.augi.com/showthread.php?t=34781&highlight=hatch+problem)

[Coolmo]

The hatch pattern originates from the BASE point and projects the hatch pattern out to the hatch boundary selected. The further away your hatch boundary is from the BASE point (or the hatch origin), the more scrambled the hatch pattern becomes due to the accuracy or decimal places of the .PAT code. With all of the small, repeated linework that makes up hatch patterns like "gravel", it appears scrambled because the linework becomes progressively worse the further away from the base point you go. After all, the gravel hatch pattern is simply a bunch of lines that "touch" each other on their endpoints to make up the little gravel circles. The BASE command use to be the only fix for this in previous versions but now you can simply pick a new origin for the specific hatch pattern without changing the BASE of the drawing.

By the way, when you changed the BASE of the drawing in older versions to fix the gravel hatch pattern and then changed it back to 0,0 (or whatever your original BASE was set to) the hatch pattern would still hold the origin point from the changed BASE.

[hugh.69031]

You can sharpen a pattern's accuracy to reduce the rate at which the pattern degrades at locations remote from the hatch pattern origin.

http://www.cadro.com.au/hatchkit/faq1.html

The attached picture shows the original pattern and the sharpened pattern side by side at '(10000000,1000000)

The sharpened pattern is attached.


Hugh Adamson
Cadro Pty Ltd