Chook question

[ksoufi]

Hi Guys,

I didn't post to this forum since ~ 2 years I was really missing this forum. I'm consulting other CAM/CAM forums . This is the BEST

 

I'm developping a chook and wondering if someone can help with this issue. It could be a simple staff !

Using MC 9.1.MR0105 Mill/Router :

looping the DB and seraching for arcs:

db_ptr_type ptr, e_ptr;

ent entity;

get_ent (&ptr, &e_ptr, &entity,ON_SCR_BIT ,A_ID,&succf);

if (!succf) break;

 

When using the trace to mprintf the center's coordinates; i.e. "entity.u.ar.c[]" It doesn't give the same results as using the menu command : Analyze>Only>Arcs.

I'm not changing the WCS.

 

What would be the reason?

 

Thanks for help

[Bullines]

Are the values of entity.u.ar.c[X], entity.u.ar.c[Y] and entity.u.ar.c[Z] at least 'close' to was you see when you use the Analyze command?

[Pete Rimkus from CNC Software Inc.]

The arc entity's center is stored in "View" coordinates. If you call world_to_view() with the arc's center and the arc's view as the 1st 2 arguments, the result will be the world location of the center

[ksoufi]

Chris,

The values are exactly the same, just the Y and Z coordinates are reversed. i.e.

Analyze command : X = 1, Y = 2 Z = 3

API function : X = 1, Y = 3 Z = 2

 

Pete,

basically , what i'm doing i simply importing a parasolid model with holes. Of course it will be loaded in MC as one body and you can’t access features (holes) . This is why I’m using the “wire representation” of the solid and use get_ent to sort arcs (circles).

 

The issue I can’t know in advance in which view these arcs are and so fart can’t use the world_to_view().

 

I would like simply to emulate the menu command : Analyze>Only>Arcs

 

 

Thanks for help

 

[ 09-01-2005, 10:08 AM: Message edited by: ksoufi ]

[Pete Rimkus from CNC Software Inc.]

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"The issue I can’t know in advance in which view these arcs are"

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I don't understand. If you've got arc entities, they have the view number stored in them. That's the view number you'll pass to world_to_view(). That is exactly what Analyze does!

 

Note also, that if Y & Z are reversed, it sounds like the arcs have been stored in Front view

[ksoufi]

OK I see what do you mean . I'll check later and let you know

[ksoufi]

Pete,

Thanks for help, it works fine with "view_to_world"

 

The outstanding issue I have is the fact that "entity.u.ar.view" could have a value other than 1 t0 6; i.e. standard views TOP, FRONT, LEFT ...etc. I tested with a solidworks cube with a single hole in the FRONT view. "entity.u.ar.view" returns 10.

[Pete Rimkus from CNC Software Inc.]

When reading in parts from other CAD systems, their views for the 6 sides of a cube may not match ours. The Z vectors will be the same (our maybe opposite!) but the X and Y directions may be different

[ksoufi]

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other CAD systems

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even thought it's a parasolid based part?

[Pete Rimkus from CNC Software Inc.]

Yes.