Away3D Forum Updating Vertex Data

Mothra, Newbie
Posted: 02 February 2013 09:06 AM Total Posts: 3

Hi,

So I’m creating a mesh on the fly by creating a bunch of vertices. Its a tail that is following a ball. Usually it appears just fine, but every now and then, when I would create a new tail, it just wouldn’t be visible at all.

I’ve tried using MeshHelper.Build as well as subGeometry.updateVertexData, and both were giving the same results. I’ve now figured out that if I use the MeshHelper.Build and turn off ‘sharedVertices’ I never have this problem. Making the tail much wider also fixes the problem (but isn’t a solution).

Any idea why its happening? Maybe away3d auto-welds vertices that are close together? Intuitively, subGeometry.updateVertexData seems like it would be a much faster solution (though I don’t know that for sure), but I can’t seem to make it work, and don’t know if I can turn off ‘sharedVertices’ for that?

Thanks,
Rob

Lexcuk, Newbie
Posted: 02 February 2013 04:28 PM Total Posts: 17 [ # 1 ]

Then I create a mesh I’m set for it boundsSubGeometry and it’s work very well.
Set the bounds side as bigger as you can, and i hopes it can be visible of any time.

boundsSubGeometry = new SubGeometry();
   geometry.subGeometries.push(boundsSubGeometry);
   //http://swf-flash.blogspot.com/2012/04/away3d-40-how-i-made-tire-marks-with.html
  }

  public function setBoundSize(minBound:Vector3D, maxBound:Vector3D):void {
   
   var xMin:Number = minBound.x;
   var xMax:Number = maxBound.x;
   
   var yMin:Number = minBound.y;
   var yMax:Number = maxBound.y;
   
   var zMin:Number = minBound.z;
   var zMax:Number = maxBound.z;
   
   var boundsVertexData:Vector.<Number> = Vector.<Number>([ 
   xMin, yMin, zMin,
   xMin, yMax, zMax,
   xMax, yMin, zMin,
   xMax, yMax, zMax
   ]);
   
   var boundsIndexArr:Vector.<uint> = Vector.<uint>([
   0, 0, 0,
   1, 1, 1,
   2, 2, 2,
   3, 3, 3,
   ]);
   
   var boundsUVData:Vector.<Number> = Vector.<Number>([
   0, 1, 1, 1, 0, 0,
   0, 1, 1, 1, 0, 0,
   0, 1, 1, 1, 0, 0,
   0, 1, 1, 1, 0, 0,
   ]);
   
   boundsSubGeometry.updateVertexData(boundsVertexData);
   boundsSubGeometry.updateUVData(boundsUVData);
   boundsSubGeometry.updateIndexData(boundsIndexArr);
   //geometry.invalidateBounds(boundsSubGeometry);
  } 

For example

lex3Strip.setBoundSize(new Vector3D( -1000, -1000, -1000), new Vector3D(1000, 1000, 1000)); 

Mothra, Newbie
Posted: 03 February 2013 06:52 AM Total Posts: 3 [ # 2 ]

Worked great! Thanks a lot!

Updating Vertex Data Software: Away3D 4.x

Mothra, Newbie Posted: 02 February 2013 09:06 AM Total Posts: 3 Hi, So I’m creating a mesh on the fly by creating a bunch of vertices. Its a tail that is following a ball. Usually it appears just fine, but every now and then, when I would create a new tail, it just wouldn’t be visible at all. I’ve tried using MeshHelper.Build as well as subGeometry.updateVertexData, and both were giving the same results. I’ve now figured out that if I use the MeshHelper.Build and turn off ‘sharedVertices’ I never have this problem. Making the tail much wider also fixes the problem (but isn’t a solution). Any idea why its happening? Maybe away3d auto-welds vertices that are close together? Intuitively, subGeometry.updateVertexData seems like it would be a much faster solution (though I don’t know that for sure), but I can’t seem to make it work, and don’t know if I can turn off ‘sharedVertices’ for that? Thanks, Rob
Lexcuk, Newbie Posted: 02 February 2013 04:28 PM Total Posts: 17 [ # 1 ] Then I create a mesh I’m set for it boundsSubGeometry and it’s work very well. Set the bounds side as bigger as you can, and i hopes it can be visible of any time. boundsSubGeometry = new SubGeometry(); geometry.subGeometries.push(boundsSubGeometry); //http://swf-flash.blogspot.com/2012/04/away3d-40-how-i-made-tire-marks-with.html } public function setBoundSize(minBound:Vector3D, maxBound:Vector3D):void { var xMin:Number = minBound.x; var xMax:Number = maxBound.x; var yMin:Number = minBound.y; var yMax:Number = maxBound.y; var zMin:Number = minBound.z; var zMax:Number = maxBound.z; var boundsVertexData:Vector.<Number> = Vector.<Number>([ xMin, yMin, zMin, xMin, yMax, zMax, xMax, yMin, zMin, xMax, yMax, zMax ]); var boundsIndexArr:Vector.<uint> = Vector.<uint>([ 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, ]); var boundsUVData:Vector.<Number> = Vector.<Number>([ 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, ]); boundsSubGeometry.updateVertexData(boundsVertexData); boundsSubGeometry.updateUVData(boundsUVData); boundsSubGeometry.updateIndexData(boundsIndexArr); //geometry.invalidateBounds(boundsSubGeometry); } For example `lex3Strip.setBoundSize(new Vector3D( -1000, -1000, -1000), new Vector3D(1000, 1000, 1000));`
Mothra, Newbie Posted: 03 February 2013 06:52 AM Total Posts: 3 [ # 2 ] Worked great! Thanks a lot!

Updating Vertex Data

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