Having problems with scene.addObject

Game Engine Game Engine Support and Discussion
1

I am trying to get a bullet to spawn at an empty, but I am am running into some problems: 1) The object, when it spawns, is smaller than it is in the layer I put it in.
2) Also, it doesn’t seem to always spawn at the empty that I am telling it to.

Here is what I am doing:
I have an empty that is parented to a player object. This player object has a keyboard sensor with true level triggering enabled that is set to all keys. This keyboard sensor is set to a python controller that is running this script:


 
if bge.logic.KX_INPUT_ACTIVE == keyboard.events[bge.events.SPACEKEY]:
      scene.addObject('bullet', 'attack_spawn', 120)

As I said, the object spawns, but it never spawns correctly. If there is anything I can make clearer, please let me know (As I’m typing this, I feel that it makes very little sense, but that may just be how tired I am right now). Thank you for your help! :smiley:

2

Your object is probably scaled up rather than the mesh itself.
First get the object and do Alt - S at the same time,
then go into edit mode and scale it that way.

Hope that helps.

3

  1. Ensure that the spawning object has its scale set to 1, 1, 1. To do this, apply its scale in Object Mode with Ctrl + A. If you can’t afford to apply its scale, then you can fix the scale of the bullet after spawning, but try the suggested solution first.

  2. You should provide a pointer to the spawning object, not just the name. Use sce.objects to get the pointer, or if you want a particular spawning empty each time, then run the script on the empty and provide the object as the pointer, or run the script on a parent of the empty, and get the empty as its child:

An example of running the script on the parent.



from bge import logic

cont = logic.getCurrentController()
obj = cont.owner
sce = logic.getCurrentScene()

attackspawn = [c for c in obj.childrenRecursive if c.name == 'attack_spawn'][0]

if bge.logic.KX_INPUT_ACTIVE == keyboard.events[bge.events.SPACEKEY]:       
     sce.addObject('bullet', attackspawn, 120)
4

@DarkFire963:
I have tried your method, but I am still coming up with the same problems. I am utterly baffled by this.

@SolarLune:
You were right, the bullet wasn’t at a scale of 1, 1, 1. I have fixed this, but the object’s shape is still distorted when it is spawned. For your 2nd point, I tried making the changes you suggested, and still nothing. However, I didn’t really understand your directions (more likely my fault than yours), so all I did was add in that line of code (changing it to fit with my naming of things). What did you mean by a pointer?

5

  1. Not the bullet, but the gun (or empty) that’s spawning the bullet should have a scale of 1, 1, 1. So, apply scaling on the spawning object and the bullet, not just on the bullet alone.

  2. Maybe I used the wrong word - reference is more accurate. If you pass a reference to the specific object that you want to sce.addObject(), it should add the object specified using that specific object reference. If you just pass a string, then I can only guess that it’ll just find whichever object is first with that name, and then spawn it there.

Instead of the string ‘attack_spawn’, get the actual object and use the object’s reference for the sce.addObject function.

6

@SolarLune:

Ahhhh, now I understand. That makes a lot of sense. Now things are working perfectly! Thank you so much SolarLune for your help. This bullet spawning code is one that I use very often, and now that you have improved it, I know I can rely on its functionality in the future!