How to move a entity ?

[perfectlifepan]

Hi..
I dont know how to move a entity only(without controlling)in the scene
Should I create a thread to process this movement?
e.g.I want to a robot form Vector3(0,0,0) to Vector(100,0,100),how to program this movement?

[discipline]

I assume you mean how can you move the entity smoothly over the course of X seconds. If you just want to move it you attach the entity to a scene node, then call setPosition() or translate() and it will jump right there in the next frame.

To move it smoothly, you need to decide on the object speed. You have a starting vector SceneNode::getPosition() and a destination vector mDestination (100,0,100). First get the destination vector:

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mDirection = mDestination - robot.getPosition();

Next normalize the direction you are going:

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mDirection.normalise();

Then in frameStarted you translate by the amount of time that has passed multiplied by the movement speed:

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bool frameStarted(const FrameEvent &evt)
{
    robot->translate(mDirection * mWalkSpeed * evt.timeSinceLastFrame);
...
}

For a more complete example, look at intermediate tutorial 1