Scaling and Collision - Am I Missing Something?

AfterBurnett

Hi guys,

I'm trying to set a rule that an actor will be destroyed if it touches another but only once it hits a certain size. I then realised that the collision box itself doesn't scale but that doesn't matter too much, I can work around that. However, I've noticed that when I'm scaling an object it can no longer collide with another... am I missing something? Is collision turned off entirely when an object is scaling?

I can work around this issue by adding an invisible actor but I'd really rather not have to complicate things...

AfterBurnett

Bumpity bump bump bump.

firemaplegames

If you are using Interpolation to scale your actor, I think the collision area doesn't update until interpolation is complete.

In this instance, until they address it, try using a Timer with a Change Attribute instead.

i.e Every 0.01 seconds or whatever, increase the size the actor. That way the collision area will match.

AfterBurnett

I was just using "change size". Thanks though, I'll give that a go!

iPhoneDevForMe

Check out my "Grow/Shrink" demo.

It is the exact solution FireMaple suggested

AfterBurnett

Will do. Cheers!

Photics

My next project... which might be better than Commove... had a problem with scaling actors and collision. To resolve this problem, I placed a quick timer around the scaling... like 0.25-0.50 seconds. While the size change wasn't as smooth, it resolved the problem. It also fit with the theme of my project.

Also, with Photics: Fireball, I resolved this issue with particles. The main actor stays the same size, but the particles change size to create the illusion of depth.

ck

This also works:

self.Size.Width = 5*cos(self.Time)*80%360+90)+self.sizeX

5 = the amount the object will grow and shrink
80 = the time cycle
360+90 = where in the cycle the size oscillation starts (90 is the operative number)
self.sizeX is a local variable setting the base size

You need to set up a "change attribute" to set self.sizeX to self.Size.Width at the start

Do the same for Y / Height

calvin9403

@ck
how do you find this thread that is 10 months old?

ck

Trying to figure out how to make things shrink and grow :-)