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OnPositionTarget for Camera?

by Christian Rousselle · in Torque Game Builder · 03/29/2008 (2:57 am) · 2 replies

Hi,

I am currently working on an intro where the camera needs to move to certain positions and zoom in/out at certain times. The problem I am facing is that there is no callback function like onPositionTarget for the camera. What I want to do is something like this:

sceneWindowPlayer0.setCurrentCameraPosition(0, 0);
sceneWindowPlayer0.setTargetCameraZoom(2);
sceneWindowPlayer0.setTargetCameraPosition(120, 80);
sceneWindowPlayer0.startCameraMove(5);

// and after that movement is finished I want to do the next movement

sceneWindowPlayer0.setTargetCameraZoom(4);
sceneWindowPlayer0.setTargetCameraPosition(320, 180);
sceneWindowPlayer0.startCameraMove(5);

The problem is that there is no callback when the movement is finished or am I missing something? I know I can mount the camera to an object an move that and have onPositionTarget but I cannot control the camera zoom this way. Does somebody have a solution?

Thank you.
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Torque Owner Diego Santos Leao - GameBlox Studio
#1
03/29/2008 (7:21 am)
I'm using scheduling for this kind of problem. I verify how much time the camera needs to end its movement and then schedule a call to a method that will perform the following tasks. For now it's enough for my needs.

If you need precision, you can also inspect the camera position using the "onUpdate" callback. When the camera reaches a predefined position, you call the method containing the next tasks.

I was having problems just like yours, and I figured I needed to start thinking in terms of callbacks and scheduling instead of "how to know when the previous task is done". There is almost always a way to do what you want!

Don't be afraid to ask again about the same subject though ;) I did and it helped me a lot.
Good luck!

Torque Owner Christian Rousselle
Default Studio Name
#2
03/29/2008 (9:04 am)
Diego, thank you for your answer. I thought about the scheduling solutions already but to be honest in my opinion this callback is missing. Polling getIsCameraMoving() in whatever function is not nice imho. I modified the source (1.7.2):

t2dSceneWindow.cc, Lines 832-848
// Complete Camera Move.
void t2dSceneWindow::completeCameraMove( void )
{
    // Quit if we're not moving.
    if ( !mMovingCamera ) return;

    // Reset Tick Camera Time.
    resetTickCameraTime();

    // Move straight to target.
    mCameraCurrent = mCameraTarget;

    // Reset Camera Move.
    mMovingCamera = false;

    // callback - camera finished movement
    Con::executef( this, 1, "onCameraMoveComplete" );
}

Handling the callback in TorqueScript seems to work very good - at least so far. Maybe somebody from GG or some of the more expericenced TGB developers can comment on this?

Thanks