[Papervision3D] Camera Orbit on mouse drag

[Steve D]

Thats what I said.  :P

On Fri, Jul 10, 2009 at 11:37 AM, John Lindquist <johnlindquist at gmail.com>wrote:

> http://pv3d.org/2008/11/19/dragging-mouse-for-camera-orbit/
>
>
> On Fri, Jul 10, 2009 at 12:31 PM, Steve D <kruass at gmail.com> wrote:
>
>> Without even looking at your code I can tell that you're using absolute
>> mouse positions to determine the camera's rotation.
>>
>> If you rotate the camera, release the mouse button, then click again
>> without moving the mouse, the camera rotates perfectly, as though nothing
>> were wrong with the code.  Yet, if you move the mouse while the mouse button
>> is released, the object will "jump" when attempting to drag again from a
>> different mousex/y position.  This indicates to me that your code is
>> utilizing absolute values of the mouse position rather than relative values.
>>
>> In your mouseDown handler, save the x/y coordinates of the click.  In your
>> mouseMove handler, incrementally update the rotation angles based on the
>> difference between the current x/y and the start of the click.
>>
>>
>>
>> On Fri, Jul 10, 2009 at 9:33 AM, Dav <dav at funkdaweb.com> wrote:
>>
>>> Hi guys,
>>>
>>> The current project I'm working on requires us to load large poly models,
>>> (6000 - 16000 polys) into our flash app and they need to be interactive,
>>> rotate, zoom etc...
>>>
>>> We need the click and drag of the scene to rotate the model, however we
>>> have
>>> noticed that rotating the model is expensive, CPU-wise. So we're trying a
>>> different approach. We want to orbit the camera around the model on click
>>> and drag.
>>>
>>> I've set up a low poly test file here:
>>> http://79.170.40.163/flashdev.com/MEL/
>>>
>>> Now the problem we are having is the camera orbit NOT starting from where
>>> you left off.
>>>
>>> For example you click and drag to rotate the model, then lift off (mouse
>>> up). Then move your mouse elsewhere and click and drag again to rotate
>>> again. The model now appears to jump to another location and rotate from
>>> there.
>>>
>>> How would I make it begin the second rotation from where it finished last
>>> time, rather than appear to jump?
>>>
>>> The source to the FlashDevelop project is zipped up here if anyone can
>>> help:
>>> http://79.170.40.163/flashdev.com/MEL/ModelViewer.zip
>>>
>>> Thanks!
>>> Dav
>>>
>>>
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>>>
>>
>>
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>
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