Changing color of body during simulation

[Roberto Echeverria]

Dear all,

I am trying to change the color of a body during a simulation. The purpose of this is to mark the bodies as soon as they start a collision.

I see that i can extract all the assets from a body.

First i downcast the shapes using CastToChCylinderShape.

Then the colors should be in the list of assets, but in principle there is no CastToChColor.

On the other hand, i see in the development reference that all classes inherited from ChAsset will be automatically downcasted, how does this work? 

Thanks in advance and regards

Roberto

[Radu Serban]

Roberto,

 

Here’s how I would do something like this (using demo_IRR_collision_trimesh.py as an example):

• After creating the body, attach a color asset to it and cache the asset:
  color_A = chrono.ChColorAsset()
  color_A.SetColor(chrono.ChColor(0.8, 0.4, 0.4))
  body_A.AddAsset(color_A)
  
  
• In the simulation loop, when desired, modify the color of the color asset and let the Irrlicht app know about the update:

color_updated = False

while(myapplication.GetDevice().run()):

    if not color_updated and mysystem.GetChTime() > 5:

        color_A.SetColor(chrono.ChColor(0.4, 0.4, 0.8))

        myapplication.AssetUpdate(body_A)

        color_updated = True

 

    myapplication.BeginScene()

    myapplication.DrawAll()

    myapplication.DoStep()

    myapplication.EndScene()

--Radu

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