package org.papervision3d.materials.shadematerials

{

import fl.motion.Color;

import flash.display.BitmapData;

import flash.display.Graphics;

import flash.geom.Matrix;

import org.papervision3d.cameras.Camera3D;

import org.papervision3d.core.math.Number3D;

import org.papervision3d.core.proto.CameraObject3D;

import org.papervision3d.core.geom.renderables.Triangle3D;

import org.papervision3d.core.geom.renderables.Vertex3DInstance;

import org.papervision3d.core.material.AbstractSmoothShadeMaterial;

import org.papervision3d.core.math.Matrix3D;

import org.papervision3d.core.proto.LightObject3D;

import org.papervision3d.core.render.data.RenderSessionData;

import org.papervision3d.core.render.draw.ITriangleDrawer;

/**

* @Author Buzzler

*/

public class NormalMaterial extends AbstractSmoothShadeMaterial implements ITriangleDrawer

{

private static var x1:Number;

private static var x0:Number;

private static var x2:Number;

private static var y0:Number;

private static var y1:Number;

private static var y2:Number;

private var camera:CameraObject3D;

private var tmpN:Number3D;

private var tmpL:Number3D;

private var tmpR:uint;

private var tmpG:uint;

private var tmpB:uint;

private var tmpRGB:uint;

public function NormalMaterial(light:LightObject3D, camera:CameraObject3D)

{

super();

this.light = light;

this.camera = camera;

}

private static var useMap:BitmapData;

override public function drawTriangle(face3D:Triangle3D, graphics:Graphics, renderSessionData:RenderSessionData, altBitmap:BitmapData = null, altUV:Matrix = null):void

{

x0 = face3D.v0.vertex3DInstance.x;

   y0 = face3D.v0.vertex3DInstance.y;

x1 = face3D.v1.vertex3DInstance.x;

y1 = face3D.v1.vertex3DInstance.y;

x2 = face3D.v2.vertex3DInstance.x;

y2 = face3D.v2.vertex3DInstance.y;

triMatrix.a = x1 - x0;

triMatrix.b = y1 - y0;

triMatrix.c = x2 - x0;

triMatrix.d = y2 - y0;

triMatrix.tx = x0;

triMatrix.ty = y0;

tmpN = face3D.faceNormal.clone();

tmpL = new Number3D(-light.x,-light.y,-light.z);

tmpR = uint((tmpN.x + 1.0) * 127.5);

tmpG = uint((tmpN.y + 1.0) * 127.5);

tmpB = uint((tmpN.z + 1.0) * 127.5);

tmpRGB = (tmpR << 16) | (tmpG << 8) | (tmpB);

graphics.beginFill(tmpRGB, brightness(tmpN, tmpL));

   graphics.moveTo( x0, y0 );

graphics.lineTo( x1, y1 );

graphics.lineTo( x2, y2 );

graphics.lineTo( x0, y0 );

graphics.endFill();

renderSessionData.renderStatistics.shadedTriangles++;

}

private function brightness(n1:Number3D, n2:Number3D):Number

{

n1.normalize();

n2.normalize();

var result:Number = Math.acos(Number3D.dot(n1, n2)) - Math.PI / 2;

result = Math.max(result, 0) / (Math.PI / 2);

return 1 - result;

}

}

}

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