topical media & game development
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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math -- animation 15
math(s) / tutorial(s)

basic perspective(s)



  scale = fl / (fl + zpos);
  sprite.scaleX = sprite.scaleY = scale;
  sprite.alpha = scale;  // optional
  sprite.x = vanishingPointX + xpos * scale;
  sprite.y = vanishingPointY + ypos * scale;

Z sorting(s)



  // array of 3D object with zpos property;
  objectArray.sortOn("zpos", Array.DESCENDING | Array.NUMERIC);
  for (var i:unint; i < numObjects; i++) {
    setChildIndex(objectArray[i].i);
  }

coordinate rotation(s)



  x1 = Math.cos(angleZ) * xpos - Math.sin(angleZ) * ypos;
  y1 = Math.cos(angleZ) * ypos + Math.sin(angleZ) * xpos;
  
  x1 = Math.cos(angleY) * xpos - Math.sin(angleY) * zpos;
  z1 = Math.cos(angleY) * zpos + Math.sin(angleY) * xpos;
  
  y1 = Math.cos(angleX) * ypos - Math.sin(angleX) * zpos;
  z1 = Math.cos(angleX) * zpos + Math.sin(angleX) * ypos;

3D distance(s)



  distance = Math.sqrt(dx*dx + dy*dy + dz*dz);
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 23/08/2009

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