CODEWITHSUNDEEP
actionscript-3rotation
Bill
Bill

Reputation: 19268

As3 sprite rotationX and rotationY

I have a bit problem with rotationX and rotationY.

It's cool if i just do a roationX and rotaionY below

_eventParent.rotationY =_differentX; 
_eventParent.rotationX =_differentY;

However once i have assign a mouse move to the _eventParent. The roationX and roationY change perspectively while the mouse is moving. so instead the item remain the same size. it increase and decrease size prospectively. any idea why is it doing this? is there a possibility to stop this behavior?

Thanks

Please find the image below.

enter image description here

Upvotes: 2

Views: 2758

Answers (2)

bwroga
bwroga

Reputation: 5459

Perspective allows part of your shape to look closer to you than other parts. The problem is that perspective has a center, or "vanishing point" and by default, it is fixed. As you move your shape farther away from the vanishing point, the perspective changes, causing your shape to widen or narrow.

You can fix this by updating the vanishing point so that it is always at the same coordinates as your shape. Since the shape will always be at the vanishing point, the perspective shouldn't change.

To do this, create a perspectiveProjection for your shape:

_eventParent.transform.perspectiveProjection = new PerspectiveProjection();

PerspectiveProjection is located in the flash.geom package, so don't forget to import it.

Then whenever you update your shape's position, update it's vanishing point:

_eventParent.transform.perspectiveProjection.projectionCenter = 
    new Point(_eventParent.x, _eventParent.y);

You might need to offset the vanishing point by a set number of pixels to get the perspective looking the way you want it to.

Upvotes: 4

abnvp
abnvp

Reputation: 1027

Correct me if I misunderstood your question. Your question is that if you apply rotation to the movieClip object, then why does the size appear to be changing?

For simplification, Let's not apply rotation on both X and Y axis. Let's take a rectangular movie clip and onMouseMove we do ++myMovieClip.rotationX;

Now, this statement is going to apply rotation on the object about the X-axis and one would get a perspective of the movie clip flipping across X -axis and this flipping will show as change in size of the object.

The same applies to rotating across y-axis.

Upvotes: 0

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