I am trying to learn how to use jBullet in a project that I am working on and I have reviewed the demo that the source provides but I just cannot figure out how these demo get objects display. Does anyone have a good resource they could point me in or provide a basic example that displays one or two objects on screen?
Thank you in advance, I am sorry I don’t have any code to show I can quickly write up some if needed but just really looking for a direction to go.
Thank you,
Code for the Cube that I am using, so I am trying to add collision to it, but i am unsure how using jbullet:
public void Draw() {
// center point posX, posY, posZ
float radius = size / 2;
//top
glPushMatrix();
glBegin(GL_QUADS);
{
glColor3f(1.0f,0.0f,0.0f); // red
glVertex3f(posX + radius, posY + radius, posZ - radius);
glVertex3f(posX - radius, posY + radius, posZ - radius);
glVertex3f(posX - radius, posY + radius, posZ + radius);
glVertex3f(posX + radius, posY + radius, posZ + radius);
}
glEnd();
glPopMatrix();
//bottom
glPushMatrix();
glBegin(GL_QUADS);
{
glColor3f(1.0f,1.0f,0.0f); // ?? color
glVertex3f(posX + radius, posY - radius, posZ + radius);
glVertex3f(posX - radius, posY - radius, posZ + radius);
glVertex3f(posX - radius, posY - radius, posZ - radius);
glVertex3f(posX + radius, posY - radius, posZ - radius);
}
glEnd();
glPopMatrix();
//right side
glPushMatrix();
glBegin(GL_QUADS);
{
glColor3f(1.0f,0.0f,1.0f); // ?? color
glVertex3f(posX + radius, posY + radius, posZ + radius);
glVertex3f(posX + radius, posY - radius, posZ + radius);
glVertex3f(posX + radius, posY - radius, posZ - radius);
glVertex3f(posX + radius, posY + radius, posZ - radius);
}
glEnd();
glPopMatrix();
//left side
glPushMatrix();
glBegin(GL_QUADS);
{
glColor3f(0.0f,1.0f,1.0f); // ?? color
glVertex3f(posX - radius, posY + radius, posZ - radius);
glVertex3f(posX - radius, posY - radius, posZ - radius);
glVertex3f(posX - radius, posY - radius, posZ + radius);
glVertex3f(posX - radius, posY + radius, posZ + radius);
}
glEnd();
glPopMatrix();
//front side
glPushMatrix();
glBegin(GL_QUADS);
{
glColor3f(0.0f,0.0f,1.0f); //blue
glVertex3f(posX + radius, posY + radius, posZ + radius);
glVertex3f(posX - radius, posY + radius, posZ + radius);
glVertex3f(posX - radius, posY - radius, posZ + radius);
glVertex3f(posX + radius, posY - radius, posZ + radius);
}
glEnd();
glPopMatrix();
//back side
glPushMatrix();
glBegin(GL_QUADS);
{
glColor3f(0.0f,1.0f,0.0f); // green
glVertex3f(posX + radius, posY - radius, posZ - radius);
glVertex3f(posX - radius, posY - radius, posZ - radius);
glVertex3f(posX - radius, posY + radius, posZ - radius);
glVertex3f(posX + radius, posY + radius, posZ - radius);
}
glEnd();
glPopMatrix();
}
Here is my converted code from the hello world test code, does this look correct to everyone? :
public static void HelloWorld() {
BroadphaseInterface broadphase = new DbvtBroadphase();
DefaultCollisionConfiguration collisionConfiguration = new DefaultCollisionConfiguration();
CollisionDispatcher dispatcher = new CollisionDispatcher(collisionConfiguration);
SequentialImpulseConstraintSolver solver = new SequentialImpulseConstraintSolver();
DiscreteDynamicsWorld dynamicsWorld = new DiscreteDynamicsWorld(dispatcher, broadphase, solver, collisionConfiguration);
// set the gravity of our world
dynamicsWorld.setGravity(new Vector3f(0, -10, 0));
// setup our collision shapes
CollisionShape groundShape = new StaticPlaneShape(new Vector3f(0, 1, 0), 1);
CollisionShape fallShape = new SphereShape(1);
// setup the motion state
DefaultMotionState groundMotionState = new DefaultMotionState(new Transform(new Matrix4f(new Quat4f(0, 0, 0, 1), new Vector3f(0, -1, 0), 1.0f)));
RigidBodyConstructionInfo groundRigidBodyCI = new RigidBodyConstructionInfo(0, groundMotionState, groundShape, new Vector3f(0,0,0));
RigidBody groundRigidBody = new RigidBody(groundRigidBodyCI);
dynamicsWorld.addRigidBody(groundRigidBody); // add our ground to the dynamic world..
// setup the motion state for the ball
DefaultMotionState fallMotionState = new DefaultMotionState(new Transform(new Matrix4f(new Quat4f(0, 0, 0, 1), new Vector3f(0, 50, 0), 1.0f)));
//This we're going to give mass so it responds to gravity
int mass = 1;
Vector3f fallInertia = new Vector3f(0,0,0);
fallShape.calculateLocalInertia(mass,fallInertia);
RigidBodyConstructionInfo fallRigidBodyCI = new RigidBodyConstructionInfo(mass,fallMotionState,fallShape,fallInertia);
RigidBody fallRigidBody = new RigidBody(fallRigidBodyCI);
//now we add it to our physics simulation
dynamicsWorld.addRigidBody(fallRigidBody);
for (int i=0 ; i<300 ; i++) {
dynamicsWorld.stepSimulation(1/60.f, 10);
Transform trans = new Transform();
fallRigidBody.getMotionState().getWorldTransform(trans);
System.out.println("sphere height: " + trans.origin.y);
}
}
Example code for jBullet HelloWorld:
}