Away3D Forum Flip Faces on Primitive

theMightyAtom, Sr. Member
Posted: 29 June 2011 06:43 PM Total Posts: 669

I’m getting an error when attempting to turn a cylinder primitive inside out.
http://videometry.net/broomstick/RealtimeDeformation.html

I’m trying to add bullet holes to an armoured plate. I add the hole, but I want a tube to show the depth of the plate. So far I’m able to add the tube in the right place (click on the plate to add a bullet hole) but the material of the cylinder is only on the outside (check out blue colour on flipside of plate)

var holeMat:ColorMaterial = new ColorMaterial(0x0000FF, 1);
   holeMat.lights = [_light];
   holeMat.bothSides = true;
   
   var c:Cylinder = new Cylinder(holeMat,-23, -20,20,16,1,false,false,false);
   //MeshHelper.invertFaces(c);
   plate.addChild(c); 

Using MeshHelper.invertFaces, I get the following:

RangeError: Error #3669: Bad input size.
 at flash.display3D::VertexBuffer3D/uploadFromVector()
 at away3d.core.base::SubGeometry/getVertexNormalBuffer()
 at away3d.core.base::SubMesh/getVertexNormalBuffer()
 at away3d.materials.passes::DefaultScreenPass/render()
 at away3d.materials::MaterialBase/renderPass()
 at away3d.core.render::DefaultRenderer/drawRenderables()
 at away3d.core.render::DefaultRenderer/draw()
 at away3d.core.render::RendererBase/executeRender()
 at away3d.core.render::RendererBase/render()
 at away3d.core.render::DefaultRenderer/render()
 at away3d.containers::View3D/render()
 at RealtimeDeformation/redraw() 

Reading through the google group I found this, http://groups.google.com/group/away3d-dev/browse_thread/thread/a1e72ffa17b07e48/a0fbaa0683f372a5?hl=en_US&lnk=gst&q=invert+faces+primitive#a0fbaa0683f372a5

I tried with a cube and get the same error.
I have the latest version of MeshHelper.as

Any ideas?

Cheers,

Pete

theMightyAtom, Sr. Member
Posted: 29 June 2011 06:49 PM Total Posts: 669 [ # 1 ]

I should also mention, generally I can’t get lights to work on the reverse side of faces even with bothsides=true on the material. They are always black. I have hunted for a bothSides for the PointLight, but haven’t found any way to apply light on both sides of a plane.

Choons, Sr. Member
Posted: 29 June 2011 09:39 PM Total Posts: 281 [ # 2 ]

I see what you mean. Still looks good though. Normal mapping for the bent metal edge of the hole?

John Brookes, Moderator
Posted: 29 June 2011 10:04 PM Total Posts: 732 [ # 3 ]

It is a bug.
Works if you don’t add a light to the material.

theMightyAtom, Sr. Member
Posted: 30 June 2011 06:44 AM Total Posts: 669 [ # 4 ]

That’s a big bug. So I guess the only workaround at the moment is to double the geometry, using a plane for each side?

Choons, yeah, you sussed it
For me that’s the real power of Molehill over other engines, the ability to easily build and manipulate complex multi-layer materials, with vector and bitmap layers, blend modes, etc. at runtime.

John Brookes, Moderator
Posted: 30 June 2011 09:20 AM Total Posts: 732 [ # 5 ]

The normal and vertexData gets lost in the Invert function.
As in
normals = new Vector.<Number>();
tangents = new Vector.<Number>();

but nothing is put into them. So when you add a light it breaks.

This ‘seems’ to work.

//...
for (i = 0; i<numSubGeoms; ++i){
 subGeom = SubGeometry(subGeometries[i]);
 indices = subGeom.indexData;
 normals = subGeom.vertexNormalData//new Vector.<Number>();
 tangents = subGeom.vertexTangentData//new Vector.<Number>();
 trace(indices.length);
 for (j = 0; j<indices.length; j+=3){
  indV0 = indices[j];
  indices[j] = indices[ind = j+1];
  indices[ind] = indV0;
 }
 for (j = 0; j < normals.length; j++)
 {
   normals[j] *=-1
 }
 
 subGeom.updateIndexData(indices);
 subGeom.updateVertexNormalData(normals);
 subGeom.updateVertexTangentData(tangents);
} 

Id wait for Fabrice to fix

theMightyAtom, Sr. Member
Posted: 30 June 2011 02:00 PM Total Posts: 669 [ # 6 ]

Cheers John, that worked like a charm
http://videometry.net/broomstick/RealtimeDeformation.html

Fabrice Closier, Administrator
Posted: 30 June 2011 02:34 PM Total Posts: 1265 [ # 7 ]

I’m busy on Prefab 2.0 atm, but will try look at this one asap..

John Brookes, Moderator
Posted: 30 June 2011 03:15 PM Total Posts: 732 [ # 8 ]

Fabrice, maybe also an option to flip faces for a subMesh as well as the whole mesh.
Sort of
invertFaces(mesh:Mesh,subg:uint)

Fabrice Closier, Administrator
Posted: 30 June 2011 03:25 PM Total Posts: 1265 [ # 9 ]

That’s a very good idea John. Added it to my skyhigh todo list :D

Concept Z, Sr. Member
Posted: 01 July 2011 02:55 AM Total Posts: 124 [ # 10 ]

see the plane

Signature

Anyone can cook but only the fearless can be great

theMightyAtom, Sr. Member
Posted: 01 July 2011 06:52 AM Total Posts: 669 [ # 11 ]

Nice one forrest,
You win the prize for stress testing the demo

Next step is “randomly ragged” holes that take into account the firing angle.
Work, work, work…

Ringo Blanken, Administrator
Posted: 01 July 2011 07:14 AM Total Posts: 120 [ # 12 ]

Zug zug

Very cool!

Signature

Freelancer: http://www.ringo.nl/en/
http://www.jiglibflash.com
http://www.awayphysics.com
http://www.away3d.com

Choons, Sr. Member
Posted: 01 July 2011 07:15 AM Total Posts: 281 [ # 13 ]

uhhh was that a bug or just OCD, forrest? @ Pete that looks way cool

theMightyAtom, Sr. Member
Posted: 01 July 2011 08:09 AM Total Posts: 669 [ # 14 ]

Cheers Choons!

Truth be known I was supposed to be making a demo showing how a kitchen sink is dynamically placed into a work top, but I got a bit carried away…

Choons, Sr. Member
Posted: 01 July 2011 03:26 PM Total Posts: 281 [ # 15 ]

LOL! Sinks by Glock® new for 2011

Flip Faces on Primitive Software: Away3D 4.x

theMightyAtom, Sr. Member Posted: 29 June 2011 06:43 PM Total Posts: 669 I’m getting an error when attempting to turn a cylinder primitive inside out. http://videometry.net/broomstick/RealtimeDeformation.html I’m trying to add bullet holes to an armoured plate. I add the hole, but I want a tube to show the depth of the plate. So far I’m able to add the tube in the right place (click on the plate to add a bullet hole) but the material of the cylinder is only on the outside (check out blue colour on flipside of plate) `var holeMat:ColorMaterial = new ColorMaterial(0x0000FF, 1); holeMat.lights = [_light]; holeMat.bothSides = true; var c:Cylinder = new Cylinder(holeMat,-23, -20,20,16,1,false,false,false); //MeshHelper.invertFaces(c); plate.addChild(c);` Using MeshHelper.invertFaces, I get the following: RangeError: Error #3669: Bad input size. at flash.display3D::VertexBuffer3D/uploadFromVector() at away3d.core.base::SubGeometry/getVertexNormalBuffer() at away3d.core.base::SubMesh/getVertexNormalBuffer() at away3d.materials.passes::DefaultScreenPass/render() at away3d.materials::MaterialBase/renderPass() at away3d.core.render::DefaultRenderer/drawRenderables() at away3d.core.render::DefaultRenderer/draw() at away3d.core.render::RendererBase/executeRender() at away3d.core.render::RendererBase/render() at away3d.core.render::DefaultRenderer/render() at away3d.containers::View3D/render() at RealtimeDeformation/redraw() Reading through the google group I found this, http://groups.google.com/group/away3d-dev/browse_thread/thread/a1e72ffa17b07e48/a0fbaa0683f372a5?hl=en_US&lnk=gst&q=invert+faces+primitive#a0fbaa0683f372a5 I tried with a cube and get the same error. I have the latest version of MeshHelper.as Any ideas? Cheers, Pete
theMightyAtom, Sr. Member Posted: 29 June 2011 06:49 PM Total Posts: 669 [ # 1 ] I should also mention, generally I can’t get lights to work on the reverse side of faces even with bothsides=true on the material. They are always black. I have hunted for a bothSides for the PointLight, but haven’t found any way to apply light on both sides of a plane.
Choons, Sr. Member Posted: 29 June 2011 09:39 PM Total Posts: 281 [ # 2 ] I see what you mean. Still looks good though. Normal mapping for the bent metal edge of the hole?
John Brookes, Moderator Posted: 29 June 2011 10:04 PM Total Posts: 732 [ # 3 ] It is a bug. Works if you don’t add a light to the material.
theMightyAtom, Sr. Member Posted: 30 June 2011 06:44 AM Total Posts: 669 [ # 4 ] That’s a big bug. So I guess the only workaround at the moment is to double the geometry, using a plane for each side? Choons, yeah, you sussed it For me that’s the real power of Molehill over other engines, the ability to easily build and manipulate complex multi-layer materials, with vector and bitmap layers, blend modes, etc. at runtime.
John Brookes, Moderator Posted: 30 June 2011 09:20 AM Total Posts: 732 [ # 5 ] The normal and vertexData gets lost in the Invert function. As in normals = new Vector.<Number>(); tangents = new Vector.<Number>(); but nothing is put into them. So when you add a light it breaks. This ‘seems’ to work. //... for (i = 0; i<numSubGeoms; ++i){ subGeom = SubGeometry(subGeometries[i]); indices = subGeom.indexData; normals = subGeom.vertexNormalData//new Vector.<Number>(); tangents = subGeom.vertexTangentData//new Vector.<Number>(); trace(indices.length); for (j = 0; j<indices.length; j+=3){ indV0 = indices[j]; indices[j] = indices[ind = j+1]; indices[ind] = indV0; } for (j = 0; j < normals.length; j++) { normals[j] *=-1 } subGeom.updateIndexData(indices); subGeom.updateVertexNormalData(normals); subGeom.updateVertexTangentData(tangents); } Id wait for Fabrice to fix
theMightyAtom, Sr. Member Posted: 30 June 2011 02:00 PM Total Posts: 669 [ # 6 ] Cheers John, that worked like a charm http://videometry.net/broomstick/RealtimeDeformation.html
Fabrice Closier, Administrator Posted: 30 June 2011 02:34 PM Total Posts: 1265 [ # 7 ] I’m busy on Prefab 2.0 atm, but will try look at this one asap..
John Brookes, Moderator Posted: 30 June 2011 03:15 PM Total Posts: 732 [ # 8 ] Fabrice, maybe also an option to flip faces for a subMesh as well as the whole mesh. Sort of invertFaces(mesh:Mesh,subg:uint)
Fabrice Closier, Administrator Posted: 30 June 2011 03:25 PM Total Posts: 1265 [ # 9 ] That’s a very good idea John. Added it to my skyhigh todo list :D
Concept Z, Sr. Member Posted: 01 July 2011 02:55 AM Total Posts: 124 [ # 10 ] see the plane Signature Anyone can cook but only the fearless can be great
theMightyAtom, Sr. Member Posted: 01 July 2011 06:52 AM Total Posts: 669 [ # 11 ] Nice one forrest, You win the prize for stress testing the demo Next step is “randomly ragged” holes that take into account the firing angle. Work, work, work…
Ringo Blanken, Administrator Posted: 01 July 2011 07:14 AM Total Posts: 120 [ # 12 ] Zug zug Very cool! Signature Freelancer: http://www.ringo.nl/en/ http://www.jiglibflash.com http://www.awayphysics.com http://www.away3d.com
Choons, Sr. Member Posted: 01 July 2011 07:15 AM Total Posts: 281 [ # 13 ] uhhh was that a bug or just OCD, forrest? @ Pete that looks way cool
theMightyAtom, Sr. Member Posted: 01 July 2011 08:09 AM Total Posts: 669 [ # 14 ] Cheers Choons! Truth be known I was supposed to be making a demo showing how a kitchen sink is dynamically placed into a work top, but I got a bit carried away…
Choons, Sr. Member Posted: 01 July 2011 03:26 PM Total Posts: 281 [ # 15 ] LOL! Sinks by Glock® new for 2011

Flip Faces on Primitive

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