Bullet Physics, Cocos3d, Debug Drawer - setDebugDrawer

I have recently managed to get the Bullet Physics debug drawer working within cocos3d.

To implement this I have created a C++ class that has access to singleton class which in turn can draw on my 3d scene.

My class inherits btIDebugDraw

class debugDrawer : public btIDebugDraw

Within

debugDrawer::drawLine(const btVector3& from,const btVector3& to,const btVector3& color)

{

  

   RuleSet *rule = [General SharedGeneral].RuleSet;

   [rule debugLine:from.x() y:from.y() z:from.z() :to.x() dy:to.y() dz:to.z()];

}

Within my shared class I have my line drawing code

-(void) debugLine :(float)x y:(float)y z:(float) z:(float)dx dy:(float)dy dz:(float) dz {

    

    float arr_location[] = {x,y,z, dx,dy, dz };

    CC3LineNode* lineNode = [CC3LineNode nodeWithName: @"Line test"];

    [lineNode populateAsLineStripWith: 2

                             vertices: arr_location

                            andRetain: YES];

    lineNode.color = ccGREEN;

    

    [_lines addObject:lineNode];

    [_activeWorld addChild:lineNode];   

  //Thanks Bill :-)  

}

I referenced my shared object which allows me to draw lines in my 3d world.

When I initialise my 3d world I attach my debugDrawer

 debugDrawer *debug;

 debug = new  debugDrawer;

 dynamicsWorld->setDebugDrawer(debug);

At the end of every synchronisation of my physics world I call my debugDrawer

 _discreteDynamicsWorld->debugDrawWorld();  // This is the internal name of the class

Before calling each synchronisation on my physics world I call a debugStart session,

this removes all my previous lines from the scene, if you want pretty patterns don't bother with the following :-)

[general.RuleSet debugStart];

Within my shared class I have

-(void) debugStart {

   

    for (CC3LineNode* lineNode in _lines) {

        [_activeWorld removeChild:lineNode];

    }

    

    [_lines removeAllObjects];

    

}

Now I can see if my physics objects are being rendered correctly.

This only implements line drawing there are other methods within btIDebugDraw 

that you could implement for further functionality.

All the best.

Duncan.