Store value from last frame and comparing it to current

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  Rooster128 polycounter lvl 8

  Oct 2014

  It'd probably have something to do with the tick event, and using a delta (not sure if blueprints uses delta or not- basically you want to check the time each tick takes in milliseconds, usually that's called tick length).
  
  If you're problem is just storing the position value and saving it, I think what you could do is create a new variable in the blueprint called old_position or whatnot, change it to type vector, and at the end of every tick (after your logic for the ashes is done), set the old_position variable to it's current position.
  
  Hope this makes sense! Sick shader btw- that looks very realistic!

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  JoakimMellergard

  Oct 2014

  Rooster128 wrote: »

  It'd probably have something to do with the tick event, and using a delta (not sure if blueprints uses delta or not- basically you want to check the time each tick takes in milliseconds, usually that's called tick length).
  
  If you're problem is just storing the position value and saving it, I think what you could do is create a new variable in the blueprint called old_position or whatnot, change it to type vector, and at the end of every tick (after your logic for the ashes is done), set the old_position variable to it's current position.
  
  Hope this makes sense! Sick shader btw- that looks very realistic!

  
  Thanks! I'll certainly try this out.
  
  I realised that I have another problem to take care of aswell.. I'll try to demonstrate:
  As it is now:
  The cigarette starts to burn - no movement. There will be ashes. The cigarette moves and the ashes disappear. The cigarette stops to move and ALL of the ashes will come back.
  But I have a feeling it shouldn't be to hard to figure this out.

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  JoakimMellergard

  Oct 2014

  Hmm I am having some trouble setting up your idea. Basically, what I want to do is this (written in pseudo code):
  
  This also helps fixing the problem i mentioned in the other post.
  
  

  oldPosition = vector3(0,0,0)
  newPosition = vector3(0,0,0)
  ashes = 1.0
  burnAmount = the curve that defines how much of the cigarette that has burned
  function Position:UpdateEveryFrame()
      newPosition = getPosition(cigarette)
      if(oldPosition == newPosition)
          oldPosition = newPosition
          ashes = ashes
      else
          oldPosition = newPosition
          ashes = burnAmount
  
  end
  

  and then I can use the ashes value to set the opacity
  
  So do you know how I can make that script in nodes?

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