Topic: Matrix3d and TransformBy help

[Spike Wilbury]

I had moved the solid so I could see the points 
Have a look at these two objects, they are the same size, but the min max results are different

Daniel,

I think I understand what you are saying

Maybe I did not explain myself on the min-max points the arx command is extracting.

I'll try again.-

For now the function returns two points on the solid let's named min & max. (if you draw a line between those two points and compare it it will be the same length)

What I am doing as the next phase, is to get the two bases of the solid, base on those two points, as soon I finished, will upload the command.

Maybe I am totally wrong.... but I am having fun

[It's Alive!]

You’re right, that’s what I did with my C# routine, it starts to get more complex as the solid become more complex,
for example when there are no 90* angles on the solid.   

[Spike Wilbury]

You’re right, that’s what I did with my C# routine, it starts to get more complex as the solid become more complex,
for example when there are no 90* angles on the solid.   

Yes, and for now I do not have any intention to get into to deep.

[Spike Wilbury]

You’re right, that’s what I did with my C# routine, it starts to get more complex as the solid become more complex,
for example when there are no 90* angles on the solid.   

I end up using the UCS command with Face option, and all the points are not shown right.

Here is the file again with the correction, still it computes just two points (rectangular faces only).

Note: WIP

PS> Cannot test your C# routine, no A2009 here...

[MickD]

You’re right, that’s what I did with my C# routine, it starts to get more complex as the solid become more complex,
for example when there are no 90* angles on the solid.   

Dan, try something like this (pseudo code) -

Find the longest edge
get a face this edge belong to //(there are 2 choices, it doesn't matter at this stage)

// the zvec of the xfrom
vecz = edge.ep - edge.sp
vecz.normalise

// the y vec of the xform, as the face normal is perp to the face it's also perp to the edge
vecy = face.normal()

// now create the x vec for the xform
vecx = vecz.crossproduct(vecy)

// if you need to xlate it as well, get the vector to the sp (start point) of the edge

vectrans = edge.sp.asVector()


Now all you need to do is build your matrices and do the work, invert them to xform back if required. The length will be bbox max.z - minz
hth


   

[Spike Wilbury]

Mick,

Have you used your pseudo code? sound very simple and straight forward. 


Again, the next correction or addition... still just for solids with rectangular faces.

It finds two faces (points) closed to the min and max points (min-max on solid).

Command: OOB

[It's Alive!]

Nice work luis,

Try this one, the command it doit

[Spike Wilbury]

Looks good, but where is the bbox

Now, try to tested with a cone.... ( it crashes acad  )

[It's Alive!]

Looks good, but where is the bbox

Well my goal was to get the dimension of the solid so I just something like..

Code: [Select]

   if(pSolid.openStatus() == Acad::eOk)
    {
      if(pSolid->transformBy(matrix.inverse()) == Acad::eOk)
      {
        pSolid->getGeomExtents(extents);
        pSolid->cancel();

        AcGePoint3d pt(extents.maxPoint().x - extents.minPoint().x ,
                       extents.maxPoint().y - extents.minPoint().y ,
                       extents.maxPoint().z - extents.minPoint().z);

        pts.append(pt);
      }
    }


Now, try to tested with a cone.... ( it crashes acad  )

OH CARP 

[Spike Wilbury]

Looks good, but where is the bbox

Well my goal was to get the dimension of the solid so I just something like..

Code: [Select]

   if(pSolid.openStatus() == Acad::eOk)
    {
      if(pSolid->transformBy(matrix.inverse()) == Acad::eOk)
      {
        pSolid->getGeomExtents(extents);
        pSolid->cancel();

        AcGePoint3d pt(extents.maxPoint().x - extents.minPoint().x ,
                       extents.maxPoint().y - extents.minPoint().y ,
                       extents.maxPoint().z - extents.minPoint().z);

        pts.append(pt);
      }
    }


Now, try to tested with a cone.... ( it crashes acad  )

OH CARP 

I know.... I was just asking

Again, it is looking good, Daniel.

Keep doing the good work!

[Spike Wilbury]

wait...

pSolid

hmm, don't have my visual studio nor my arx sdk....

is transformBy available directly ? I forgot... I am all a mess today

AcDb3Dsolid? or you are casting as an entity?

[MickD]

all ent's have the transformBy() method, they  inherit it from Entity (AcDbEntity).

[Spike Wilbury]

all ent's have the transformBy() method, they  inherit it from Entity (AcDbEntity).

Gracias Mick


Mind is clearing now....

[It's Alive!]

es muy bueno 

[Spike Wilbury]

es muy bueno 

Let try it...

(Dan, is that you on the avatar?...)