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Problem changing the velocity/angle of a spawned emitter.
http://45.55.195.193/viewtopic.php?f=73&t=15861		 Page 1 of 1
Author:  Foogooman [ Tue Jul 14, 2009 10:17 pm ]
Post subject:  Problem changing the velocity/angle of a spawned emitter.
So, my script spawns an emitter that flies across the map. I want it to spawn high at get fired to the left and downwards. So I put this code in

Code:
         SandP.Vel.X = -math.random(150) - 50;
         SandP.Vel.Y = -math.random(35) - 40;


The line "SandP.Vel.X = -math.random(150) - 50;" works just dandy, sending the emitter flying to the left at a nice speed. The line "SandP.Vel.Y = -math.random(35) - 40;" doesn't work so well. It made the partciels fly upwards instead of downwards. So, I changed it to "SandP.Vel.Y = -math.random(-35) - -40;" thinking that making them negative would cause the emitter to fly down. However, now the emitter never spawns at all. how can I get it to have a downward velocity?
Author:  Mind [ Tue Jul 14, 2009 10:21 pm ]
Post subject:  Re: Problem changing the velocity/angle of a spawned emitter.
Use this

Code:
SandP.Vel.Y = math.random(35) + 40;

Edit: Y is switched around in CC. negative y velocity is upward, positive y velocity is downward.
Author:  Grif [ Tue Jul 14, 2009 10:25 pm ]
Post subject:  Re: Problem changing the velocity/angle of a spawned emitter.
Man I lose count of how many times I've said this.

CC's whole entire coordinate system (all of it) is based on the fourth quadrant of a graph. The top left corner of a scene is the "origin" of that graph. You will never need negative scene coordinates.
Author:  mail2345 [ Tue Jul 14, 2009 11:53 pm ]
Post subject:  Re: Problem changing the velocity/angle of a spawned emitter.
Velocity is the vector in question, Grif.
Author:  Grif [ Wed Jul 15, 2009 2:29 am ]
Post subject:  Re: Problem changing the velocity/angle of a spawned emitter.
It's still the same system.
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