Away3D Forum Increasing distance from origin

maddog, Sr. Member
Posted: 22 October 2011 07:09 PM Total Posts: 118

I am playing around with increasing and decreasing objects distance form origin while maintaining angle of departure. I split a sphere into peaces and want the pieces to increase and decrease their distance from origin. However I have never been a math wiz so I am having a hard time raping my head around the math. Anyone have any ideas of equation I should look at for this or does away already have a function to implement this?
thanks for any Ideas : )

Somokon, Member
Posted: 22 October 2011 09:45 PM Total Posts: 75 [ # 1 ]

This function should do it.

function addDistance(point:Vector3D, d:Number):Vector3D {
   
    var r:Number = Math.sqrt(point.x*point.x + point.z*point.z + point.y*point.y);
    var theta:Number = Math.acos(point.y / r);
    var phi:Number = Math.atan2(point.z, point.x);
   
    r += d;
   
    return new Vector3D(r*Math.sin(theta)*Math.cos(phi), r*Math.cos(theta), r*Math.sin(theta)*Math.sin(phi));
} 

It converts to spherical coordinates, adds the distance, then converts it back to an (x,y,z) Cartesian point.

maddog, Sr. Member
Posted: 22 October 2011 11:46 PM Total Posts: 118 [ # 2 ]

Thanks for the help. It projects parts at a constant distance, but not angle like I want unless I am still doing it wrong. this is the code so far.

function addDistance(point:Vector3D, d:Number):Vector3D {
      var r:Number = Math.sqrt(point.x*point.x + point.z*point.z + point.y*point.y);
      var theta:Number = Math.acos(point.y / r);
      var phi:Number = Math.atan2(point.z, point.x);
      r += d;
      return new Vector3D(r*Math.sin(theta)*Math.cos(phi), r*Math.cos(theta), r*Math.sin(theta)*Math.sin(phi));
  }  
  
  
  function onOverModel(event:MouseEvent3D):void {
   
    Mesh(event.object).mouseEnabled=false;
    var current:Vector3D = new Vector3D(event.target.position.x, event.target.position.y, event.target.position.z);
    var moveHere:Vector3D = addDistance(current, -2);
    
    TweenNano.to(event.object, .2, {x:moveHere.x, y:moveHere.y ,z:moveHere.z, onComplete:returnMe});
    function  returnMe(){
     TweenNano.to(event.object, .5, {x:current.x, y:current.y ,z:current.z, onComplete:function(){Mesh(event.object).mouseEnabled=true;}});
    }
   
  } 

Here is what happens with that code:
http://www.lukascanoe.com/away3d/IsoSphere.html

maddog, Sr. Member
Posted: 22 October 2011 11:46 PM Total Posts: 118 [ # 3 ]

——

80prozent, Sr. Member
Posted: 23 October 2011 01:06 AM Total Posts: 430 [ # 4 ]

hi

i think what you need to do is to move the verts along their normals.

you find more info about this in this thread:

http://away3d.com/forum/viewthread/979/

hope that helps

80

Signature

sorry…i hope my actionscript is better than my english…

maddog, Sr. Member
Posted: 23 October 2011 01:44 AM Total Posts: 118 [ # 5 ]

I think my problem was the sphere was not aligned right to origin. I took it back into blender and realigned origin to mesh and it worked.

Some what working

I have notice a glitch where sometime pieces lose there mouse enabled status and no longer are able to be clicked. any ideas?

John Brookes, Moderator
Posted: 23 October 2011 01:00 PM Total Posts: 732 [ # 6 ]

You shouldn’t need to mess with spherical coords
If its points on the surface of a sphere located at the origin all you have to do is multiply the position of that point.

Increasing distance from origin Software: Away3D 4.x

maddog, Sr. Member Posted: 22 October 2011 07:09 PM Total Posts: 118 I am playing around with increasing and decreasing objects distance form origin while maintaining angle of departure. I split a sphere into peaces and want the pieces to increase and decrease their distance from origin. However I have never been a math wiz so I am having a hard time raping my head around the math. Anyone have any ideas of equation I should look at for this or does away already have a function to implement this? thanks for any Ideas : )
Somokon, Member Posted: 22 October 2011 09:45 PM Total Posts: 75 [ # 1 ] This function should do it. `function addDistance(point:Vector3D, d:Number):Vector3D { var r:Number = Math.sqrt(point.xpoint.x + point.zpoint.z + point.ypoint.y); var theta:Number = Math.acos(point.y / r); var phi:Number = Math.atan2(point.z, point.x); r += d; return new Vector3D(rMath.sin(theta)Math.cos(phi), rMath.cos(theta), rMath.sin(theta)Math.sin(phi)); }` It converts to spherical coordinates, adds the distance, then converts it back to an (x,y,z) Cartesian point.
maddog, Sr. Member Posted: 22 October 2011 11:46 PM Total Posts: 118 [ # 2 ] Thanks for the help. It projects parts at a constant distance, but not angle like I want unless I am still doing it wrong. this is the code so far. function addDistance(point:Vector3D, d:Number):Vector3D { var r:Number = Math.sqrt(point.xpoint.x + point.zpoint.z + point.ypoint.y); var theta:Number = Math.acos(point.y / r); var phi:Number = Math.atan2(point.z, point.x); r += d; return new Vector3D(rMath.sin(theta)Math.cos(phi), rMath.cos(theta), rMath.sin(theta)Math.sin(phi)); } function onOverModel(event:MouseEvent3D):void { Mesh(event.object).mouseEnabled=false; var current:Vector3D = new Vector3D(event.target.position.x, event.target.position.y, event.target.position.z); var moveHere:Vector3D = addDistance(current, -2); TweenNano.to(event.object, .2, {x:moveHere.x, y:moveHere.y ,z:moveHere.z, onComplete:returnMe}); function returnMe(){ TweenNano.to(event.object, .5, {x:current.x, y:current.y ,z:current.z, onComplete:function(){Mesh(event.object).mouseEnabled=true;}}); } } Here is what happens with that code: http://www.lukascanoe.com/away3d/IsoSphere.html
maddog, Sr. Member Posted: 22 October 2011 11:46 PM Total Posts: 118 [ # 3 ] ——
80prozent, Sr. Member Posted: 23 October 2011 01:06 AM Total Posts: 430 [ # 4 ] hi i think what you need to do is to move the verts along their normals. you find more info about this in this thread: http://away3d.com/forum/viewthread/979/ hope that helps 80 Signature sorry…i hope my actionscript is better than my english…
maddog, Sr. Member Posted: 23 October 2011 01:44 AM Total Posts: 118 [ # 5 ] I think my problem was the sphere was not aligned right to origin. I took it back into blender and realigned origin to mesh and it worked. Some what working I have notice a glitch where sometime pieces lose there mouse enabled status and no longer are able to be clicked. any ideas?
John Brookes, Moderator Posted: 23 October 2011 01:00 PM Total Posts: 732 [ # 6 ] You shouldn’t need to mess with spherical coords If its points on the surface of a sphere located at the origin all you have to do is multiply the position of that point.

Increasing distance from origin

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