[Proscene] rotate camera around scene center according to 2D mouse position

kamtron

[Proscene] rotate camera around scene center according to 2D mouse position

in Contributed Library Questions • 4 months ago

Hi all :) (sorry for my english)

Currently playing with proscene, I would like to rotate my camera around a point (lets say scene center 0,0,0) according to the 2D mouse coordinates and while my mouse is moving..

What I'm trying to achieve is this: depending of the mouseX, camera will rotate between [-90°, 90°] around scene's Y axis.

Same for mouseY, the camera have to rotate around the X axis of the scene..

For those who know Proscene it's by default the same effect when you drag your mouse.. the camera automatically rotates around the scene center. But I don't know how to do this only while my mouse is moving.

As I forgot all my maths, I tried to implement several snippets from different language, and took a look to proscene classes source, but it seems that I'm a bit lost after all.. :( Any help would be much appreciated!

Thanks! :)

Replies(2)

nakednous

Re: [Proscene] rotate camera around scene center according to 2D mouse position

4 months ago

noted and taken as a suggestion. It's just a limitation of the current proscene event system which I hope to improve in the next major release (>=2). Currently you can achieve this only under first person camera profile ( scene . hideCursorOnFirstPerson ( true )). Please refer to the ThirdPersonCamera example found under the CameraHandling category.

kamtron

Re: [Proscene] rotate camera around scene center according to 2D mouse position

4 months ago

Hi nakednous,

Thx for your reply :)

In fact, I finally achieved this effect in a dirty way I think..

I'm just "emulating" the drag effect by defining an event point (the one you define in your source when mousePressed()), then I copied/pasted some code from InteractiveCameraFrame.

inside draw() method:

eventPoint = new Point(_tX, _tY); // mouseX mouseY
PVector trans = camera.projectedCoordinatesOf(cameraFrame.arcballReferencePoint());
Quaternion rot = deformedBallQuaternion((int)eventPoint.x, (int)eventPoint.y, trans.x, trans.y, camera);
cameraFrame.setSpinningQuaternion(rot);
cameraFrame.spin();
prevPos = eventPoint;
}

and adapt deformedBallQuaternion() & projectOnBall() for my project.

Thx again, I'll keep an eye on the future Proscene release!

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