Papervision3D: understanding Plane object – part 3

核心提示：In this 3rd part we’ll discover two interesting features:1) How to add a bitmap texture to a plane2) How to set the camera to make Papervision3D units mat

In this 3rd part we’ll discover two interesting features:

1) How to add a bitmap texture to a plane

2) How to set the camera to make Papervision3D units match pixels

Let’s start… the “units Vs pixels” issue can be a problem when we want a plane (or whatever) to have a precise size in pixels.

Settings the camera properly can solve the problem… this is the same script used in Papervision3D: understanding Plane object – part 2 with a couple of modifications:

package　{
　import　flash.display.Sprite;
　import　flash.events.Event;
　import　org.papervision3d.cameras.Camera3D;
　import　org.papervision3d.render.BasicRenderEngine;
　import　org.papervision3d.scenes.Scene3D;
　import　org.papervision3d.view.Viewport3D;
　import　org.papervision3d.objects.primitives.Plane;
　import　org.papervision3d.materials.ColorMaterial;
　import　org.papervision3d.materials.BitmapFileMaterial;
　public　class　papervision　extends　Sprite　{
　　public　var　viewport:Viewport3D　=　new　Viewport3D();
　　public　var　scene:Scene3D　=　new　Scene3D();
　　public　var　camera:Camera3D　=　new　Camera3D();
　　public　var　renderer:BasicRenderEngine　=　new　BasicRenderEngine();
　　public　var　bitmap_material:BitmapFileMaterial　=　new　BitmapFileMaterial("http://www.google.com/intl/en_ALL/images/logo.gif");
　　public　var　red_material:ColorMaterial=new　ColorMaterial(0xff0000);
　　public　var　frontplane:Plane=new　Plane(red_material,200,300,4,5);
　　public　var　backplane:Plane=new　Plane(bitmap_material,200,300,4,5);
　　public　function　papervision()　{
　　　addChild(viewport);
　　　camera.focus=100;
　　　camera.zoom=10;
　　　backplane.rotationY=180;
　　　scene.addChild(frontplane);
　　　scene.addChild(backplane);
　　　addEventListener(Event.ENTER_FRAME,　render);
　　}
　　public　function　render(e:Event)　{
　　　frontplane.yaw(1);
　　　backplane.yaw(1);
　　　renderer.renderScene(scene,　camera,　viewport);
　　}
　}
}

At lines 22-23 I am setting the camera in a way the 200 and 300 “units” defining the plane size at lines 18-19 are equivalent to pixels.

Our planes now are 200×300 pixels sized.

Then I introduced a new material, the BitmapFileMaterial one… imported at line 10, declared at line 16 (look how do I import the image… passing the URL) at assigned at line 19

And that’s all… look at the double sided plane with the Google logo on its back…

Next time, we’ll add some interaction.