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Scale a mesh?


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I went way outside my normal world and used vector script to create a mesh of an object which I couldn't build using standard script tools.  I built the object in Vectorworks, then exported it as a 3d vector script to get the mesh coordinates.  Then I added all that into a script that I am writing to build that part of the object.  That all works exactly as intended.  

 

BUT,  I want to be able to scale that mesh with user input.  So, I added some scaling fields into the OIP.  Cool.  All that is great, except at the mesh doesn't scale.  

 

Here's a general layout of the code:

 

BeginGroupN(groupname);
   BeginMesh;
      ClosePoly;
      *a bunch of 3d poly coordinates*
   EndMesh;
   EndGroup;

 

Now, I have tried HScale3d both just after EndMesh with LNewObj as the handle, and after EndGroup with "group name" as the handle.  Neither seems to have any effect.  Is there a step I'm missing here to scale a mesh overall?

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It appears that HScale3D does not work on meshes.

 

Procedure Test;

BEGIN
	AlrtDialog(Concat(GetTypeN(FSActLayer)));
	HScale3d(FSActLayer, 0,0,0, 2,2,2);
End;

Run(Test);

 

Draw a rectangle, extrude it (or push/pull) and run the script. It doubles in size. Convert the solid to a mesh and run the script, It does not change size.

 

The menu commands Scale... does work on meshes, but requires the dialog box.

 

No good suggestions. Sorry.

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OK, I found a work around that might work.  Convert the mesh to a solid, scale it, then convert back to a mesh.

 

I THINK the reason that HScale3D does not work is that under the hood a Mesh is effectively a group of 3D polys. And HScale3D does not work on groups.

 

Try this and see if it will fit your needs.

 

Procedure Test;

Var H1:Handle;
	N1:Integer;

BEGIN
	ClosePoly;
	BeginMesh;
		Poly3D(-1,0,0, 1,0,0, 0,-1,1);
		Poly3D(-1,0,0, 1,0,0, 0,-1,0);
		Poly3D(-1,0,0, 0,-1,0, 0,-1,1);
		Poly3D(1,0,0, 0,-1,0, 0,-1,1);
	EndMesh;
	N1:=AddSolid(LNewObj,LNewObj, H1);
	HScale3d(H1, 0,0,0, 2,2,2);
	DoMenuTextByName('Convert to Mesh', 0);
	
End;

Run(Test);

 

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13 minutes ago, Pat Stanford said:

OK, I found a work around that might work.  Convert the mesh to a solid, scale it, then convert back to a mesh.

 

I THINK the reason that HScale3D does not work is that under the hood a Mesh is effectively a group of 3D polys. And HScale3D does not work on groups.

 

Try this and see if it will fit your needs.

 

Procedure Test;

Var H1:Handle;
	N1:Integer;

BEGIN
	ClosePoly;
	BeginMesh;
		Poly3D(-1,0,0, 1,0,0, 0,-1,1);
		Poly3D(-1,0,0, 1,0,0, 0,-1,0);
		Poly3D(-1,0,0, 0,-1,0, 0,-1,1);
		Poly3D(1,0,0, 0,-1,0, 0,-1,1);
	EndMesh;
	N1:=AddSolid(LNewObj,LNewObj, H1);
	HScale3d(H1, 0,0,0, 2,2,2);
	DoMenuTextByName('Convert to Mesh', 0);
	
End;

Run(Test);

 

That did the trick.  Don't even need to convert it back to a mesh.  

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