bouncing ball

const int GROUND_HEIGHT = 1;const int GRAVITY = 0.098;const int AIR_FRICTION_MULTIPLIER = 0.999;if (pos.y < GROUND_HEIGHT)    vel.y = -abs(vel.y)vel.y += GRAVITY;vel *= AIR_FRICTION_MULTIPLIER;pos += vel;renderTheBall(pos);

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if (pos.y < GROUND_HEIGHT) vel.y = -abs(vel.y)

if (pos.y < GROUND_HEIGHT){pos.x=0vel.y = -abs(vel.y)}

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Original post by _Madman_ Quote: if (pos.y < GROUND_HEIGHT) vel.y = -abs(vel.y) I had issue with this some time ago. If time delta is a large enough, ball stucks somwhere in plane. 1) \/ ----------- 2) ----\/----- 3) ----------- \/ case 1 is when ball is falling down or flying up and everything is ok. but cases 2 and 3 can occour, when pos.y is below plane. Imagine that ball is falling and test stops in case 3 because of large timestep, velocity is reversed but next timestep is not 1, but 2 instead (because of friction). Velocity gets reversed again and you get case 3 again, prolly even further below plane. I found a simple way to fix this by adding 1 more line: if (pos.y < GROUND_HEIGHT){pos.x=0vel.y = -abs(vel.y)}

vel.y = -vel.y;

vel.y = -abs(vel.y);

pos.y = GROUND_HEIGHT;

const float GROUND_HEIGHT = 240;const float CEILING_HEIGHT = 0;const float LEFT_SIDE = 0;const float RIGHT_SIDE = 320;const float GRAVITY = 0.098;const float AIR_FRICTION_MULTIPLIER = 0.999;vel.y += GRAVITY;vel *= AIR_FRICTION_MULTIPLIER;pos += vel;if (pos.y > GROUND_HEIGHT){    vel.y = -abs(vel.y);    pos.y = 2 * GROUND_HEIGHT - pos.y;}else if (pos.y < CEILING_HEIGHT){    vel.y = abs(vel.y);    pos.y = 2 * CEILING_HEIGHT - pos.y;}if (pos.x > RIGHT_SIDE){    vel.x = -abs(vel.x);    pos.x = 2 * RIGHT_SIDE - pos.x;}else if (pos.x < LEFT_SIDE){    vel.x = abs(vel.x);    pos.x = 2 * LEFT_SIDE - pos.x;}renderTheBall(pos);