O3D-discuss Google Group

Re: 回复：Re: [O3D-discuss:3207] o3d pick and move delay problem

doomtemp...@yahoo.com.tw (Dave) — Wed, 01 Jun 2011 06:09:27 UT

Hi Zuo,

I hope I did interpret your question correctly.

I assume the slow down was caused by multiple picking. The default
picking function in O3D is not the fastest picking that was
implemented.

Since you are only moving along with a plane, how about you just do
picking only once.

Use picking to grab the tangent value of the point. Later, you can

回复：Re: [O3D-discuss:3207] o3d pick and move delay problem

wzuoadjus...@gmail.com (zuo) — Thu, 19 May 2011 16:37:49 UT

Hi, Nicolas
My code structure is almost like this:
It is to move a object on a specified plane.
var objPos; // position of the object to be selected
var objTransform;
function mouseMove(e) {
//...
// two points make a line
var pos1 = unproject(e.x, e.y, 0.25);
var pos2 = unproject(e.x, e.y, 0.75);

Re: [O3D-discuss:3207] o3d pick and move delay problem

nic.kas...@gmail.com (Nicolas Kassis) — Thu, 19 May 2011 15:38:24 UT

HI Zuo,
I have the same problem as you, trying to translate objects around and
I can't come up with something as smooth as what I use for rotation (I
took the code from the Arc Ball example). Would you mind posting the
code you are using, we could compare.
Nic

o3d pick and move delay problem

wzuoadjus...@gmail.com (zuo) — Thu, 19 May 2011 15:13:02 UT

Hi!
I am new to o3d/webgl, and i implement my own javascript function to do
unproject and intersection calculation for 'pick and move'.
Each time the mouse moving to a new position(x, y), i apply translation to
the transform of the selected shape according to my calculation,
which results in delay, i mean, the mouse cursor moves faster than the

Re: o3d code not in chromium src repository anymore?

nic.kas...@gmail.com (Nicolas Kassis) — Thu, 12 May 2011 18:52:47 UT

Found the relevant commit, what do they mean by up one level. Where is
that? All I see in the commit summary is delete.
commit 6f9ed711e07885269bd4bc45fc5a88 7f15f076fe
Author: bradnel...@google.com
<bradnel...@google.com@0039d31 6-1c4b-4281-b951-d872f2087c98>
Moving o3d up a level, to get it out of chrome checkouts.

o3d code not in chromium src repository anymore?

nic.kas...@gmail.com (Nicolas Kassis) — Thu, 12 May 2011 18:47:31 UT

Is it just me or is the code for o3d no longer in the Chromium repository?
Did they purge it because no one was maintaining it?

O3D moving cuts by mouse - medical data

xsych...@gmail.com (Xrew) — Thu, 31 Mar 2011 12:38:59 UT

Hi,
i haven't solved my problem yet.
I have made some progress, but it's still not OK. When i click, i get
intersection point of mouse and object in 3D. Then i calculate normal
of cut, which i collapse to screen. So i get two vectors
Normal of cut and mouse vector on screen. Then i calculate scalar

requestAnimationFrame

rudia...@gmail.com (ruben) — Mon, 28 Mar 2011 13:57:40 UT

Hi there!

I am new to webgl-o3d and to this discussion group.
I was playing with the pool example, changing stuff and learning about
o3d. I tried to get requestAnimationFrame working in o3d, but no luck.
Is it planned in a near future to include requestAnimationFrame
feature to o3d? Some hint?

Re: [O3D-discuss:3200] Re: Disable anti-alias in O3D Webgl

nic.kas...@gmail.com (Nicolas Kassis) — Thu, 31 Mar 2011 03:50:58 UT

Yes it is, I migrated as soon as the plugin was deprecated.
I have to admit, I have yet to find a real problem with the feature
provided by the O3D library. The only thing I find a little annoying
is the documentation, it would be cool to be able to update it a bit.
Nic

Re: Disable anti-alias in O3D Webgl

doomtemp...@yahoo.com.tw (Dave) — Thu, 31 Mar 2011 03:20:22 UT

Hi Nic,

I don't see why we cannot using O3D-Webgl, I think the library itself
is pretty solid - although more samples and features from Google will
be great. Unfortunately, the popularity just isn't there to drive
Google's attention to continue to maintain their own O3D library. Just
hope that once they had finalised the WebGL implementation for Chrome,

Re: [O3D-discuss:3198] Re: Disable anti-alias in O3D Webgl

nic.kas...@gmail.com (Nicolas Kassis) — Thu, 31 Mar 2011 02:14:54 UT

Yeah, that makes sense, I guess you could create a new client
everytime you want to change those settings.
I do feel like were fighting a losing battle continuing to use O3D.
I'm too busy to look at alternatives right now.
If you feel like checking out my app it's now live:
[link]

Re: Disable anti-alias in O3D Webgl

doomtemp...@yahoo.com.tw (Dave) — Thu, 31 Mar 2011 01:56:59 UT

Hi Nic,

Thanks for your reply. It is always good to see some one still using
this O3D framework.

However, this method haven't seems to be implemented in the Webgl
version, it toss me an error when I tried to do it.
Also, I realized it can never be done in Webgl since the attributes
such as anti-alias, alpha, depthmask...etc can only be triggered at

Re: [O3D-discuss:3196] Re: Disable anti-alias in O3D Webgl

nic.kas...@gmail.com (Nicolas Kassis) — Tue, 29 Mar 2011 14:58:28 UT

Hi Dave,
I'm not sure if it's still valid but in the doc for make client:
[link]
you can pass NotAntiAliased as an option. That should remove the need
from modifying client.js
I don't know if you can do it for short periods and re-enable it late

Re: Disable anti-alias in O3D Webgl

doomtemp...@yahoo.com.tw (Dave) — Tue, 29 Mar 2011 06:35:55 UT

Hi again,

Ok, I had successfully disabled the anti-alias by modifiying the
client.js in o3d-webgl.
However, I just want it to disable anti-alias for a short period, so
how do I do that without interfering the client.js?

And I confirmed that anti-alias will break picking or polygon
selection based on colours.

Disable anti-alias in O3D Webgl

doomtemp...@yahoo.com.tw (Dave) — Tue, 29 Mar 2011 06:27:13 UT

Hi all,

I haven't almost complete the segmentation tool O3D-Webgl version.
However, select visible surfaces only works well in Firefox, and
Chrome will select extra unwanted polygons.

I suspect it is anti-alias in Chrome that causes this problem, since
I'm using colour detection to identify visible polygons. While Firefox