AS3 Flash 3D Engine Alternativa Platform Drops A Nuke - Isometric and FPS
April 17, 2008 — drawkThis will blow you away. Found first via mrdoob (with quantum rss reading capability, before the message is concieved mrdoob is there).
Alternativa Platform, previously Alternativa Game, launched their Alternativa Platform milestone 1 and really one demo would have been enough but there are some great demos there that literally put them what appears a couple laps up on the 3d FPS style engine in Flash.
The engine is highly optimized and smooth, heavy on the processor, but using the ‘t’ key you can see some nice revealing triangle rendering. Also, playing with the field of view adds for some nice game effects. (try jumping on the fans in the half-life like room in the first demo)
Check the textures
See the Matrix
Get superpowers
From Above, Isometric
Here is what is to come from the platform:
- dynamic lighting and shadows (точечные и направленные источники света);
- bump lighting;
- parallax mapping;
- automatic UV-mapping;
- sprites, 3D-sprites;
- sprite lighting;
- texture objects;
- Global Illumination imitation;
- sprite pre-render system (phases render on server using uploaded 3D-models);
- animation system (including inverse kinematics);
- 3D-objects interactivity;
- physics simulation.
Congrats to the Russian based Alternativa Platform, the world is watching.
+ skyB;
var ambientIllumination:Number = .1;
var canvas:BlankClip;
var theta:Number = 0;
var mouseIsDown:Boolean = false;
var mouseDownTheta:Number = 0;
var mouseDownX:Number = 0;
public function RayTracer()
{
outputBitmapData = new BitmapData(BUFFER_WIDTH, BUFFER_HEIGHT, false);
outputBitmap = new Bitmap(outputBitmapData);
addChild(outputBitmap);
//outputBitmap.smoothing = true;
outputBitmap.width= 320;
outputBitmap.height = 240;
canvas = new BlankClip;
addChild(canvas);
canvas.buttonMode = true;
canvas.useHandCursor = true;
frameTimeTxt = new TextField();
frameTimeTxt.defaultTextFormat = new TextFormat("Arial");
frameTimeTxt.x = 8;
frameTimeTxt.y = 8;
frameTimeTxt.width = 640;
frameTimeTxt.textColor = 0xFFFFFF;
frameTimeTxt.selectable = false;
addChild(frameTimeTxt);
t = 0;
addEventListener(Event.ENTER_FRAME, update, false, 0, true);
canvas.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
canvas.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
}
public function mouseDownHandler(e:*):void
{
mouseIsDown = true;
mouseDownX = stage.mouseX;
mouseDownTheta = theta;
}
public function mouseUpHandler(e:*):void
{
mouseIsDown = false;
}
public function update(e:*)
{
// start frame timer and update global time
var timer:Number = getTimer();
t += dt;
// handle mouse rotation
if( mouseIsDown ) theta = mouseDownTheta - .0015 * (stage.mouseX - mouseDownX);
theta += dt;
// do some funky animation
sphereCenterX[0] = .5*Math.sin(theta*5);
sphereCenterZ[0] =1 + .5*Math.cos(theta*5);
sphereCenterX[1] = .5*Math.sin(theta*5 + 2 * Math.PI / 3);
sphereCenterZ[1] = 1 + .5*Math.cos(theta*5 + 2 * Math.PI / 3);
sphereCenterX[2] = .5*Math.sin(theta*5 + 4 * Math.PI / 3);
sphereCenterZ[2] = 1 + .5*Math.cos(theta*5 + 4 * Math.PI / 3);
// reused variables
var x:int;
var y:int;
var i:int;
var j:int;
var r:int;
var g:int;
var b:int;
var dx:Number;
var dy:Number;
var rayDirX:Number;
var rayDirY:Number;
var rayDirZ:Number;
var rayDirMag:Number;
var reflectRayDirX:Number;
var reflectRayDirY:Number;
var reflectRayDirZ:Number;
var intersectionX:Number;
var intersectionY:Number;
var intersectionZ:Number;
var reflectIntersectionX:Number;
var reflectIntersectionY:Number;
var reflectIntersectionZ:Number;
var rayToSphereCenterX:Number;
var rayToSphereCenterY:Number;
var rayToSphereCenterZ:Number;
var lengthRTSC2:Number;
var closestApproach:Number;
var halfCord2:Number;
var dist:Number;
var normalX:Number;
var normalY:Number;
var normalZ:Number;
var normalMag:Number;
var illumination:Number;
var reflectIllumination:Number;
var reflectR:Number;
var reflectG:Number;
var reflectB:Number;
// setup light dir
var lightDirX:Number = .3;
var lightDirY:Number = -1;
var lightDirZ:Number = -.5;
var lightDirMag:Number = 1/Math.sqrt(lightDirX*lightDirX +lightDirY*lightDirY +lightDirZ*lightDirZ);
lightDirX *= lightDirMag;
lightDirY *= lightDirMag;
lightDirZ *= lightDirMag;
// vars used to in intersection tests
var closestIntersectionDist:Number;
var closestSphereIndex:int;
var reflectClosestSphereIndex:int;
// compute screen space bounding circles
//canvas.graphics.clear();
//canvas.graphics.lineStyle(1, 0xFF0000, .25);
for(i = 0; i < numSpheres; ++i)
{
sphere2dX[i] = (BUFFER_WIDTH / 2 + FOV * sphereCenterX[i] / sphereCenterZ[i]);
sphere2dY[i] = (BUFFER_HEIGHT /2 + FOV * sphereCenterY[i] / sphereCenterZ[i]);
sphere2dR[i] = (3 * FOV * sphereRadius[i] / sphereCenterZ[i]);
//canvas.graphics.drawCircle(sphere2dX[i]*BUFFER_SCALEDDOWN, sphere2dY[i]*BUFFER_SCALEDDOWN, sphere2dR[i]*BUFFER_SCALEDDOWN);
sphere2dR[i] *= sphere2dR[i]; // store the squared value
}
// write to each pixel
outputBitmapData.lock();
for(y = 0; y < BUFFER_HEIGHT; ++y)
{
for(x = 0; x < BUFFER_WIDTH; ++x)
{
// compute ray direction
rayDirX = x - HALF_BUFFER_WIDTH;
rayDirY = y - HALF_BUFFER_HEIGHT;
rayDirZ = FOV;
rayDirMag = 1/Math.sqrt(rayDirX * rayDirX + rayDirY * rayDirY +rayDirZ * rayDirZ);
rayDirX *= rayDirMag;
rayDirY *= rayDirMag;
rayDirZ *= rayDirMag;
/// trace the primary ray ///
closestIntersectionDist = Number.POSITIVE_INFINITY;
closestSphereIndex = -1
for(i = 0; i < numSpheres; ++i)
{
// check against screen space bounding circle
dx = x - sphere2dX[i];
dy = y - sphere2dY[i];
if( dx * dx + dy * dy > sphere2dR[i] ) continue;
// begin actual ray tracing if its inside the bounding circle
lengthRTSC2 = sphereCenterX[i] * sphereCenterX[i] +
sphereCenterY[i] * sphereCenterY[i] +
sphereCenterZ[i] * sphereCenterZ[i];
closestApproach = sphereCenterX[i] * rayDirX +
sphereCenterY[i] * rayDirY +
sphereCenterZ[i] * rayDirZ;
if( closestApproach < 0 ) // intersection behind the origin
continue;
halfCord2 = sphereRadius[i] * sphereRadius[i] - lengthRTSC2 + (closestApproach * closestApproach);
if( halfCord2 < 0 ) // ray misses the sphere
continue;
// ray hits the sphere
dist = closestApproach - Math.sqrt(halfCord2);
if( dist < closestIntersectionDist )
{
closestIntersectionDist = dist;
closestSphereIndex=i;
}
}
/// end of trace primary ray ///
// primary ray doesn't hit anything
if( closestSphereIndex == - 1)
{
outputBitmapData.setPixel(x, y, skyColor);
}
else // primary ray hits a sphere.. calculate shading, shadow and reflection
{
// location of ray-sphere intersection
intersectionX = rayDirX * closestIntersectionDist;
intersectionY = rayDirY * closestIntersectionDist;
intersectionZ = rayDirZ * closestIntersectionDist;
// sphere normal at intersection point
normalX = intersectionX - sphereCenterX[closestSphereIndex];
normalY = intersectionY - sphereCenterY[closestSphereIndex];
normalZ = intersectionZ - sphereCenterZ[closestSphereIndex];
normalX /= sphereRadius[closestSphereIndex]; // could be multiply by precacluated 1/rad
normalY /= sphereRadius[closestSphereIndex];
normalZ /= sphereRadius[closestSphereIndex];
// diffuse illumination coef
illumination = normalX * lightDirX +
normalY * lightDirY +
normalZ * lightDirZ;
if( illumination < ambientIllumination )
illumination = ambientIllumination;
/// trace a shadow ray ///
var isInShadow:Boolean = false;
for(j = 0; j < numSpheres; ++j)
{
if( j == closestSphereIndex ) continue;
rayToSphereCenterX = sphereCenterX[j] - intersectionX;
rayToSphereCenterY = sphereCenterY[j] - intersectionY;
rayToSphereCenterZ = sphereCenterZ[j] - intersectionZ;
lengthRTSC2 = rayToSphereCenterX * rayToSphereCenterX +
rayToSphereCenterY * rayToSphereCenterY +
rayToSphereCenterZ * rayToSphereCenterZ;
closestApproach = rayToSphereCenterX * lightDirX +
rayToSphereCenterY * lightDirY +
rayToSphereCenterZ * lightDirZ;
if( closestApproach < 0 ) // intersection behind the origin
continue;
halfCord2 = sphereRadius[j] * sphereRadius[j] - lengthRTSC2 + (closestApproach * closestApproach);
if( halfCord2 < 0 ) // ray misses the sphere
continue;
isInShadow = true;
break;
}
/// end of shadow ray ///
if( isInShadow ) illumination *= .5;
/// trace reflected ray ///
if( sphereReflects[closestSphereIndex] )
{
// calculate reflected ray direction
var reflectCoef:Number = 2 * (rayDirX * normalX + rayDirY * normalY + rayDirZ * normalZ);
reflectRayDirX = rayDirX - normalX * reflectCoef;
reflectRayDirY = rayDirY - normalY * reflectCoef;
reflectRayDirZ = rayDirZ - normalZ * reflectCoef;
closestIntersectionDist = Number.POSITIVE_INFINITY;
reflectClosestSphereIndex = -1
for(j = 0; j < numSpheres; ++j)
{
if( j == closestSphereIndex ) continue;
rayToSphereCenterX = sphereCenterX[j] - intersectionX;
rayToSphereCenterY = sphereCenterY[j] - intersectionY;
rayToSphereCenterZ = sphereCenterZ[j] - intersectionZ;
lengthRTSC2 = rayToSphereCenterX * rayToSphereCenterX +
rayToSphereCenterY * rayToSphereCenterY +
rayToSphereCenterZ * rayToSphereCenterZ;
closestApproach = rayToSphereCenterX * reflectRayDirX +
rayToSphereCenterY * reflectRayDirY +
rayToSphereCenterZ * reflectRayDirZ;
if( closestApproach < 0 ) // intersection behind the origin
continue;
halfCord2 = sphereRadius[j] * sphereRadius[j] - lengthRTSC2 + (closestApproach * closestApproach);
if( halfCord2 < 0 ) // ray misses the sphere
continue;
// ray hits the sphere
dist = closestApproach - Math.sqrt(halfCord2);
if( dist < closestIntersectionDist )
{
closestIntersectionDist = dist;
reflectClosestSphereIndex=j;
}
} // end loop through spheres for reflect ray
if( reflectClosestSphereIndex == - 1) // reflected ray misses
{
r = sphereR[closestSphereIndex] * illumination;
g = sphereG[closestSphereIndex] * illumination;
b = sphereB[closestSphereIndex] * illumination;
}
else
{
//trace("ref hit");
// location of ray-sphere intersection
reflectIntersectionX = reflectRayDirX * closestIntersectionDist + intersectionX;
reflectIntersectionY = reflectRayDirY * closestIntersectionDist + intersectionY;
reflectIntersectionZ = reflectRayDirZ * closestIntersectionDist + intersectionZ;
// sphere normal at intersection point
normalX = reflectIntersectionX - sphereCenterX[reflectClosestSphereIndex];
normalY = reflectIntersectionY - sphereCenterY[reflectClosestSphereIndex];
normalZ = reflectIntersectionZ - sphereCenterZ[reflectClosestSphereIndex];
normalX /= sphereRadius[reflectClosestSphereIndex]; // could be multiply by precacluated 1/rad
normalY /= sphereRadius[reflectClosestSphereIndex];
normalZ /= sphereRadius[reflectClosestSphereIndex];
// diffuse illumination coef
reflectIllumination = normalX * lightDirX +
normalY * lightDirY +
normalZ * lightDirZ;
if( reflectIllumination < ambientIllumination )
reflectIllumination = ambientIllumination;
r = sphereR[closestSphereIndex] * illumination + .5 * sphereR[reflectClosestSphereIndex] * reflectIllumination;
g = sphereG[closestSphereIndex] * illumination + .5 * sphereG[reflectClosestSphereIndex] * reflectIllumination;
b = sphereB[closestSphereIndex] * illumination + .5 * sphereB[reflectClosestSphereIndex] * reflectIllumination;
if( r > 255 ) r = 255;
if( g > 255 ) g = 255;
if( b > 255 ) b = 255;
} // end if reflected ray hits
} /// end if reflects
else // primary ray doesn't reflect
{
r = sphereR[closestSphereIndex] * illumination;
g = sphereG[closestSphereIndex] * illumination;
b = sphereB[closestSphereIndex] * illumination;
}
outputBitmapData.setPixel(x, y, (r<<16) + (g<< 
