hatch patterns on Imported AutoCAD Drawings

[burchd]

I am finding that in most cases, hatch patterns come in and are correct as they are viewed / plotted in autocad.

We experiance sometimes hatch patterns which turn into solid, uncontrollable blocks, like a sollid fill.

How do we control how hatch patterns are assigned? Is there some sort of mapping that is required to correctly identify hatches between AutoCAD and REVIT?

Thankyou.

[cliff collins]

Both Autocad and Revit use the (old/cryptic) .pat file for generation of hatch/fill patterns.

Do a quick search in Revit Help under "fill patterns"--- and also "importing/exporting".

Revit's fill patterns come in two varieties: Drafting and Model.
These are defined in the syntax of the .pat file text.
Drafting patterns only show in individual views where applied/
Model patterns "stick" to the model and show in all views.

As far as some patterns from cad becoming solid/black--it could be a scaling issue.
You may want to check/adjust the scale of the pattern in Autocad, and then re-import
into Revit, to see if this makes any difference?

Also--a word of caution on using cad inside Revit:

- "Link" the cad into Revit, and use Manage Links, -vs- Importing only.
- Make sure to Link only into views you need the cad in--not into all views, as Revit will suffer a performance hit trying to manage the cad in all views.

Cheers.......

[burchd]

These hatch patterns show up correctly in AutoCAD, but turn black when the detail is imported.

It is allways the same pattern, which is a non standard AutoCAD pattern for Rigid insulation, called Rigid.pat. I have identified a couple of others.

So i found the c:\program files\revit Architecture 2008\data, directory where there were 2 revit.pat files. one metric one imperial. when i copied the custom autocad .pat files to this location, and reinserted as a link the dwg files the missing hatch patterns now showed up.

I am assuming that this is the solution.

However, it would be nice for revit to reference the same hatch patterns as autocad. Is there a way to do this?