I'm using ViaCAD Pro 10 on macOS X Mojave (10.14.3).

I have two low/medium complexity solids.

I overlap a part of one solid ('A') onto other solid ('B'), click "Subtract Solid", click on solid 'A' (the solid I wanted subtracted from) and then click on solid 'B' (the solid I want subtracted from solid 'A').

ViaCAD Pro 10 removes solid 'A' from the window and puts up a dialog titled "ACIS Error", with the message:

"Two or more vertices of one body mapped to a single entity of the other body:Part_..."

When I click the "Ok" button solid 'A' is returned to the window without being modified.

I get the same error when I hold down the option key when clicking on solid 'B', or if I try to use "Intersect Solid"

I quit and restarted ViaCAD Pro, and copy/pasted copies of the two solids into a new file. The problem still occurs.

I quit & restarted ViaCAD Pro, copy/pasted copies of the two solids into a new file, and used 'CutOut Solid" to cut away half of both solids (to see if I could isolate the part(s) of the solids causing the problem).. When I tried to reproduce the issue ViaCAD reports a different "ACIS Solid" error:

"system inconsistency processing edge coincidence:ACIS Solid_..."

As with the "two or more vertices..." ACIS error, solid A was removed from the workspace before the error dialog was presented, but like the other error, when I click "Ok" solid A is restored to the workspace.

I've attached a .vcp file that (at least for me) consistently produces the error. I'll try cutting away different parts of the two solids to see if I can identify the specific section of solid 'a' and/or 'b' that's triggering the error.

Although I suspect that I can avoid this issue by recreating one or both solids from scratch, I'm hoping someone will spot the specific flaw/mistake in the solid(s) that causes this error so that I can avoid it in the future.

thanks,

kz.

ps. strangely, **after** I get the "two or more vertices..." error, *but* *not* (near as I was quickly able to determine) when I get the "system inconsistency..." error, ViaCAD Pro's solid add/subtract behavior changes (until I quit and restart ViaCAD Pro).

* add solid - If I create two cubes, place one of the faces of cube 'A' (Part_77799824) against one of the faces of cube 'B' (Part_77799879), and then use 'add solid' to combine solid 'A' to solid 'B', I end up with 3 solids: the expected (combined) 'AB' solid (Part_77799824) **and** the original and still separate 'A' (also named Part_77799824 and 'B'(Part_77799879) solids.

normally adding two solids together results in a single (combined) solid, without leaving the original solids in the work space.

* subtract solid - if I create identical two cubes, and overlap half of cube 'a' over half of cube 'b', and then use subtract solid to remove the overlapped portion of cube 'b' from cube 'a', the overlapping portion of the two cubes isn't subtracted from cube 'a'.

Probably many ways to do it,
hope this helps.
Larry

Thanks, this does help! I now understand what you meant, and was able to use your approach to subtract 'b' from 'a'.

My actual design is somewhat more complicated than the example I uploaded, but I'm sure I can adapt the approach to my project.

Many, many thanks!

kz.

Thanks!

> When you see parallel walls on a wall that should be on the same plane it starts to look like parallel walls when maxed zoomed. I have a good graphics card so might be the reason you can't see that.

Now that I know exactly what you're looking at I can see what you describe.

> Also, the inside of the tab should also be planar with the inner wall of the frame. So I would start with fixing the model.

Remember that the uploaded ACIS Error file is just an example that reproduces the ACIS error, and isn't my actual project.

In the actual project the inside of the tab isn't planar with the inner wall of the frame, and the error still occurs.

Which means that it's likely "When you see parallel walls on a wall that should be on the same plane it starts to look like parallel walls when maxed zoomed." is the cause of the ACIS error. I'll look closely at the walls/surfaces on the actual project and clean them up.

Thus far I've been unsuccessful in finding an online tutorial or reference that specifically demonstrates/describes/discusses how to use the "Match Surface" tool, but I'll keep looking!

Thanks,

Kz.

It turns out that in my actual project the problem was the (equivalent of that) section that you circled, which has two surfaces.

The good news is that when I fixed that section to have a single surface, I was able to subtract solid 'b' from solid 'a'

The bad news is that I could only fix that area through brute force, using the push/pull tool.

I take it that if I could learn how to use the "match surface" tool that I wouldn't need to use the brute force (push/pull) approach to fix this sort of problem?

Right now I predict that it'll only take another 15... maybe only 10... minutes of pointless clicking on all the edges of those two surfaces (in my 'broken' project) using the "match surface" tool (with ***ABSOLUTELY*** nothing happening!!! :-( :-( ) before I go completely nuts.

So... Forgive my snark when I say that (for *me*) the match surface tool is useless.

but, many, many thanks (again) for identifying the root cause of the ACIS error. I might not be able to fix this sort of issue using the match surface tool, but at least I'll be able to identify and fix the problem... brute force.

I don't think the match surface tool works because the change is so minuscule. I think I would start by bringing down the decimal place in your model to 4 decimal places and work with work plane on at all times. There are videos I've seen around that show how the match surface tool works.