How to make only part of an actor collidable?

sparx13

Hi, I'm making a game where arrows are shooting out of a tower at enemies, but when it shoots the enemy instead of the arrow head hitting the enemy the end of the arrow hits the enemy. Is there a way I can make only the top part of the arrow collide with the enemy and destroy it, and only the top. Or is there a way I can make a mini separate actor that is invisible that sticks to the arrow and only when that mini actor hits the enemy it destroys it? The second way would probably be better.

simo103

@sparx13 ... yes your second way is best. Here is some info:

http://forums.gamesalad.com/discussion/46451/help-constraining-actors

http://forums.gamesalad.com/discussion/38105/constraining-1-actor-to-another-while-both-rotate-in-sync-with-each-other

jamie_c

Hi Sparkx13,

I had posted a simple project here showing how to constrain one actor to another. It's still available for download if you're interested.

www.clay-communications.com/jamie/constrain-actors-together.zip

Jamie

RThurman

Here is an equation to put into the angle:
vectorToAngle( game.Mouse.Position.X - self.Position.X , game.Mouse.Position.Y - self.Position.Y )

Currently it will point to the mouse. You can modify it to get it to point at your moving target.

sparx13

Thanks I give that a go

sparx13

I tried following and it worked but is there a way I can spawn them both and still make the invisible actor on the tip of the arrow?

sparx13

I'm not sure if this was the best way of doing it, at the moment I can't get the arrow to go at the enemy. I can either get the arrow to fly in the right direction but face the wrong way or the opposite. I really need help with this one!

RThurman

When you make and import the image of the arrow, it needs to point exactly to the right like this: -----> This makes the beginning angle of the arrow at '0' degrees.

Then it will be easier to give you formulas/equations that will get it flying in the correct direction.

sparx13

Ok thanks I have imported the arrow facing the right, but I'm unsure where to go from here.

sparx13

I'm stuck at the moment still unsure how to get it to go in the right direction and face the right direction.

RThurman

First work on getting the arrow to fly in the correct direction. Then work on constraining a second actor (the arrowhead) later.

The arrow's beginning direction (angle) will be between 0 and 359 degrees. Zero points directly to the right, 90 points directly up, 180 points directly to the left, and 270 points directly down.

Use a "Rotate To Angle" behavior to make the arrow point in the direction you want.

sparx13

Thats the bit I'm unsure about because the thing it shooting at is moving past it. And I need the arrow to fly at the moving target. I want the arrow to go strait at the moving target, how do I do this?