you can use getMaterialByName method and getChildByName to control it

你可以给那个面的材质命名！然后getMaterialByName 得到材质使其具有交互性 用getChildByName得到该面对象

Now. There is a *. dae file, which has a model of how to get the model of a face. Or which part. And then interact with the surface and the mouse?
现在.有一个*.dae文件，里面有一个模型，该如何获得这个模型的一个面.或者其中的一部份.然后用这个面与鼠标交互？

can you teach me how can I add a BitmapMaterial on the mesh?

kingg64@hotmail.com

When creating a plane or another primitive, papervision creates the UV for each triangle in the primitive. For this example however, one has to manually compute the UV array. Being new to this kind of stuff i can't seem to understand how this is done so i kind of need some help on this one.

Regards,
Alex.

I don't know why I read Trianglesaurus Rex...

Hi John,

I've taken this tutorial further and created a bunch of faces that will tween to become a sphere.

Earlier on this site, I requested a way to explode faces and I think I found a way to do a reverse explosion. I don't think it's the most efficient way but I'd like to know your thoughts.

Here is the code that I'm using. It might not work if you just copy and paste. I'm using FlashDevelop with a preloader. This is the code from Main.as.

package
{
import flash.display.Sprite;
import flash.events.Event;

// import papervision
import org.papervision3d.view.BasicView;
import org.papervision3d.core.geom.TriangleMesh3D;
import org.papervision3d.core.geom.renderables.Triangle3D;
import org.papervision3d.core.geom.renderables.Vertex3D;
import org.papervision3d.core.math.NumberUV;
import org.papervision3d.materials.ColorMaterial;
import org.papervision3d.objects.primitives.Sphere;

// import tweener
import caurina.transitions.Tweener;

/**
* ...
* @author DefaultUser (Tools -> Custom Arguments...)
*/
public class Main extends BasicView
{
private var allTriangles:Array = new Array();

public function Main():void
{
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}

private function init(e:Event = null):void
{
removeEventListener(Event.ADDED_TO_STAGE, init);
// entry point

// create a sphere so we can grab all of its faces
var sphere:Sphere = new Sphere(null, 100, 15, 15);
var sphereFaces:Array = sphere.geometry.faces;

// create a ColorMaterial that we'll add to each triangle we create
var material:ColorMaterial = new ColorMaterial(0xCC0000);
material.doubleSided = true;

// loop through each of the faces in the sphere
for each (var sphereTriangle:Triangle3D in sphereFaces)
{
// add all of vertices for the triangle in the an array
var sphereTriangleVertices:Array = sphereTriangle.vertices;

// create an array that will later contain the vertices for the triangle we'll create
var triangleVertices:Array = new Array();

// loop through all of the vertices
for each (var sphereTriangleVertex3D:Vertex3D in sphereTriangleVertices)
{
// create a new Vertex3D and set its vertices
var vertex3D:Vertex3D = new Vertex3D(sphereTriangleVertex3D.x, sphereTriangleVertex3D.y, sphereTriangleVertex3D.z);

// push the newly created Vertex3D to the triangleVertices array
triangleVertices.push(vertex3D);
}

// create a new Triangle3D
// we set the uv from the triangle in the sphere so we can add listeners later if we want
var triangle3D:Triangle3D = new Triangle3D(null, triangleVertices, material, sphereTriangle.uv);

// create an array that will contain the triangle faces
var triangleFaces:Array = [triangle3D];

// create a new TriangleMesh3D
var triangleMesh3D:TriangleMesh3D = new TriangleMesh3D(material, triangleVertices, triangleFaces, null);

// create the triangle3D's dad
triangle3D.instance = triangleMesh3D;

// position the triangleMesh3D randomly
triangleMesh3D.x = Math.random() * 1500 - 750;
triangleMesh3D.y = Math.random() * 1500 - 750;
triangleMesh3D.z = Math.random() * 1000 - 500;
triangleMesh3D.rotationY = Math.random() * 360 - (360 / 2);

// add the triangleMesh3D to the allTriangles array
allTriangles.push(triangleMesh3D);

// add the triangleMesh3D to the stage
scene.addChild(triangleMesh3D);
}

// render the scene
startRendering();

// tween each triangle to it's original position
for each (var triangle:TriangleMesh3D in allTriangles)
{
Tweener.addTween(triangle, { x:0, y:0, z:0, rotationY:0, time:2, delay:2 } );
}
}

}

}

@trix - I didn't create the UV in this example (to keep it simple), so it won't know how to map the bitmap on the object. I'll put it on my list to posts to make.

Is it possible to apply a BitmapAssetMaterial on the TriangleMesh3D? I tried but I get an error #1009
BitmapColorMaterial works fine as well as the ColorMaterial in your example.
--
ERROR: MaterialObject3D: transformUV() uv not found!
TypeError: Error #1009: Cannot access a property or method of a null object reference.

Is it possible to use quaterFaces?

Tried
triangleMesh3d.quarterFaces();

but that throws an error
papervision3d\core\geom\TriangleMesh3D.as:285]

Hi,
I tried this example with a GouraudMaterial and a light but the triangle is shaped black. can you tell me why?