How to check the object's physics type through python.

Game Engine Game Engine Support and Discussion
1

Hello, i’m making a python script, and in this script i need to apply something to all static objects in the scene, but how do i check to see if the object is static?

Any help appreciated
Many thanks in advance!

Thales

2

Edit: nevermind. Disregard this :slight_smile:

bpy.data.objects[YourObject/Objects].game.physics_type

You can use the above. The value for a static type is ‘STATIC’.
Like: if bpy.data.objects[Objects].game.physics_type == ‘STATIC’

Online reference here: http://www.blender.org/documentation/blender_python_api_2_67_release/bpy.types.GameObjectSettings.html#bpy.types.GameObjectSettings.physics_type

Hope it helps :wink:

3

Don’t do this. It’s not available in the BGE runtime, and for a good reason.

4

Oh, in that case, sorry - disregard my post :slight_smile:

5

There’s a way to do this, but it’s not perfect.

Dynamic and Rigid objects have KX_GameObject.mass, but Static, Sensor and No Collision don’t. Static and Sensor have KX_GameObject.setCollisionMargin or KX_GameObject.getPhysicsId() not equal to zero, No Collision doesn’t. Unfortunately Radius and Anisotropic Friction cannot be accessed through bge, so as far as I know you couldn’t determine whether an object is Static or Sensor, by just looking at the KX_Scene.objects. However, if by chance all Static objects are visible and all Sensor object aren not, then you can. Also, if necessary rule out all Cameras and Lights with KX_Scene.cameras and KX_Scene.lights. But normally they would have No Collision anyway.

So this is the code:

def getStaticObjects(cont):
    staticObList = []
    for ob in cont.owner.scene.objects:
        if ob.visible and ob.getPhysicsId() and not ob.mass:
            staticObList.append(ob)
    print(staticObList)

Edit: this function gets Dynamic/Rigid, Static/Sensor and No Collision:

def getPhysicsType(cont):
    rigid_dynamic_obList = []
    static_sensor_obList = []
    no_collision_obList = []
    for ob in cont.owner.scene.objects:
        if ob.getPhysicsId():
            if ob.mass:
                rigid_dynamic_obList.append(ob)
            else:
                static_sensor_obList.append(ob)
        else:
            no_collision_obList.append(ob)
    print('Rigid and Dynamic objects: ' + str(rigid_dynamic_obList))
    print('Static and Sensor objects: ' + str(static_sensor_obList))
    print('No Collision objects: ' + str(no_collision_obList))
6

I usually check the mass. Non physics types have a mass of zero.

Indeed this is more an empirical measurement, that might be wrong or change in future.

Raco’ solution seems to fit better as he checks he physicsId. I would not look for vsibility as this is irrelevant for physics calculation.

7

This wouldn’t be too hard to expose in the api. My only concern is that currently the enum for physics object type is stored in a struct and so one would need to change the code to have the enum in the constants list

8

It sure would be nice. I wish I could program and help refining.

9

Added a patch, but not sure if it will make it to trunk
http://projects.blender.org/tracker/index.php?func=detail&aid=35680&group_id=9&atid=127

10

That’s great agoose77! Hope it will make it. Could I also manually apply the patch to my existing Blender version? I’m sorry but this is new for me.

11

Wow, you guys are awesome, thank you, Raco, for the scripts.