[JAVA3D] Problem when changing BranchGroup's children

[Saeed Ansari]

Hello,

I want to change the attributes of a BranchGroup's children. I have set the capability of the BranchGroup :

 BranchGroup bgRoot = new BranchGroup();

 bgRoot.setCapability(BranchGroup.ALLOW_CHILDREN_READ);
 bgRoot.setCapability(BranchGroup.ALLOW_CHILDREN_WRITE);

 

and when I want to read the children like below I get error :

 

for (int i=0; i < bgRoot.numChildren(); i ++)
        {
           Object obj = (Object) bgRoot.getChild(i);
           if ( obj instanceof Building ) System.out.println(" OK ");
        }

 

Do you know what is the problem ?

 

Regards,

Saeed

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