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POActionscript collisions: solving exceptions and strange cases
 

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  1. POActionscript collisions: solving exceptions and strange cases
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    <p>I have created a collision class to detect collisions using pixels. In my class I've also developed some functions for determining the collsion angle. Based on this I created some examples:</p> <p><a href="http://megaswf.com/serve/25437/" rel="nofollow noreferrer">http://megaswf.com/serve/25437/</a></p> <p><a href="http://megaswf.com/serve/25436/" rel="nofollow noreferrer">http://megaswf.com/serve/25436/</a></p> <p>(Space to change gravity, right/left to give some speed to the ball.)</p> <p>As you will probably notice, there are strange things that happen:</p> <ul> <li>When the ball speed is very low</li> <li>When the direction of the ball is almost tangent to the obstacle.</li> </ul> <p><a href="http://img514.imageshack.us/img514/4059/colisao.png" rel="nofollow noreferrer">collision http://img514.imageshack.us/img514/4059/colisao.png</a></p> <p>The above image shows how I calculate the collision angle. I call the red dots the keypoints. I search for a maximum number of keypoints (normally 4). If I find more then 2 keypoints, I choose the 2 farthest ones (as shown in one of the blue objects). Thats how I then find the normal angle to where in the surface the object collided. I don't know if this is an obsolete way of doing things.</p> <p>based on that angle, I rotate the speed vector to do the bouncing.</p> <p>The piece of code to do the maths is here:</p> <pre><code>static public function newSpeedVector(speedX: Number, speedY: Number, normalAngle: Number): Object{ var vector_angle: Number = Math.atan2(speedY, speedX) * (180/Math.PI); var rotating_angle: Number = (2*(normalAngle - vector_angle) + 180) % 360; var cos_ang: Number = Math.cos(rotating_angle/DEGREES_OF_1RAD); var sin_ang: Number = Math.sin(rotating_angle/DEGREES_OF_1RAD); var final_speedX: Number = speedX * cos_ang - speedY * sin_ang; var final_speedY: Number = speedX * sin_ang + speedY * cos_ang; return {x_speed: final_speedX, y_speed: final_speedY}; } </code></pre> <p>This is how the new speed vector is calculated...</p> <p>My question is, has anyone faced this kind of problem or has some idea on how to avoid this from happening? </p>
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    1. COYou'll need to post relevant snippets from your collision code
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