Is springElasticStiffness of loadSoftBody() working?

[konbraphat51]

Is springElasticStiffness of loadSoftBody() working?

I made a little change of load_soft_body example (https://github.com/bulletphysics/bullet3/blob/master/examples/pybullet/examples/load_soft_body.py) to check the performance of softbody. The cube will fall down on the bunny in the code below.

Even when I made springElasticStiffness parameter to 100 or anything, the compression of the bunny didn't changed at all. Why?

import pybullet as p
from time import sleep
import pybullet_data

physicsClient = p.connect(p.GUI)

p.setAdditionalSearchPath(pybullet_data.getDataPath())
p.setGravity(0, 0, -10)
planeId = p.loadURDF("plane.urdf", [0,0,-2])
boxId = p.loadURDF("cube.urdf", [0,0,2],useMaximalCoordinates = True)
bunnyId = p.loadSoftBody("bunny.obj", 
                        springElasticStiffness = 0.01,
                        mass = 1
                      )

#meshData = p.getMeshData(bunnyId)
#print("meshData=",meshData)
#p.loadURDF("cube_small.urdf", [1, 0, 1])
useRealTimeSimulation = 1

if (useRealTimeSimulation):
  p.setRealTimeSimulation(1)

p.changeDynamics(boxId,-1,mass=10)
while p.isConnected():
  p.setGravity(0, 0, -10)
  if (useRealTimeSimulation):

    sleep(0.01)  # Time in seconds.
    #p.getCameraImage(320,200,renderer=p.ER_BULLET_HARDWARE_OPENGL )
  else:
    p.stepSimulation()