Speed and movement question

MattButlerStudios

I have 2 questions that need to be addressed.

1) How do I make an object (a ball for instance) not always move in the same direction when hitting an object. For instance say I have a room and the ball keeps hitting the floor and then hitting the ceiling endlessly. I want the ball to sometimes change it's angle and hit the wall occasionally. How do I make this happen?


2) How do I make the ball (as described above) maintain a constant speed and never change from that speed?


Thank your for your help in advance. -MattButlerStudios

MattButlerStudios

Anyone?

Hopscotch

@MattButlerStudios‌, to point 1

Put the following rules in the actor:

**Rule**: When All (this checks left and right)

"Num Expression" vectorToAngle(self.Motion.LinearVelocity.X, self.Motion.LinearVelocity.Y) = 0 

and

Actor collides with Wall

then

Change Velocity

Direction = vectorToAngle(self.Motion.LinearVelocity.X, self.Motion.LinearVelocity.Y) + random(-10,10) relative to scene

Speed = lets say 300


**Rule**: When All (this checks up and down)

"Num Expression" vectorToAngle(self.Motion.LinearVelocity.X, self.Motion.LinearVelocity.Y) = 90 

and

Actor collides with Wall

then

Change Velocity

Direction = vectorToAngle(self.Motion.LinearVelocity.X, self.Motion.LinearVelocity.Y) + random(-10,10) relative to scene

Speed = lets say 300

Hopscotch

@MattButlerStudios‌ ,

for point 2, make sure that friction is set to 0 in all walls and actors that collide.

Also make sure drag is set to 0 in the moving actors.

This way the motion should not slow down over time, despite collisions.

MattButlerStudios

@Hopscotch‌ Wow, thank you for the excellent response!

Hopscotch

My pleasure @MattButlerStudios‌

Just to add to your constant speed question, bounciness should be set to 1 in all colliding actors.

So, a system with

• bouncyness = 1
• friction = 0
• drag = 0

will conserve all kinetic energy.

MattButlerStudios

@Hopscotch‌ just wanted to thank you again for the help. Everything turned out great!