Re: [osg-users] Intersect Point Cloud wth precision

Take the results from the PolytopeIntersector, project them to screen space, measure the distance from your mouse XY to the projected point, sort the result set by this metric and take the closest. On Fri, Dec 23, 2016 at 3:22 AM, Robert Osfield wrote: > HI Bruno, > >

Re: [osg-users] Intersect Point Cloud wth precision

HI Bruno, For a point cloud you may be best to implement your own osgUtil::Intersector, the design is meant to facilitate this, LineSegmentIntersector and PolytopeIntersector are both examples of subclasses from Intersector so you could use these as inspriation. Robert On 22 December 2016 at

Re: [osg-users] Intersect.

Danny Lesnik wrote: I'm trying to use intersect for primitive collision detection. I load one 3DS file into my scene and test whether this object has any intersections. The problem is following: Although ,there is only one object in my scene, I can clearly see that this object intersects with

Re: [osg-users] Intersect.

Hi Paul, I just can't realize I have only one object its bs radius os 43. what is the object that I can intersect with on x =12,5? There supposed to be nothing. Thank you! Cheers, Danny -- Read this topic online here:

Re: [osg-users] Intersect.

Danny Lesnik wrote: I just can't realize I have only one object its bs radius os 43. what is the object that I can intersect with on x =12,5? There supposed to be nothing. Thank you! The only suggestion I have is to check out what is really going on by writing a small OSG app that shows

Re: [osg-users] Intersect.

-users@lists.openscenegraph.org Subject: Re: [osg-users] Intersect. Hi Paul, I just can't realize I have only one object its bs radius os 43. what is the object that I can intersect with on x =12,5? There supposed to be nothing. Thank you! Cheers, Danny -- Read this topic

Re: [osg-users] Intersect.

Danny Lesnik wrote: Hi, I'm trying to use intersect for primitive collision detection. I load one 3DS file into my scene and test whether this object has any intersections. The problem is following: Although ,there is only one object in my scene, I can clearly see that this object intersects

Re: [osg-users] Intersect.

Hi Paul, Thank you for your help. I think I understand now what LineSegmentIntersector is doing. What might be the correct approach to test wether bounding sphere intrsect with any other project? My idea is to move object with UpdateCallBack and stop movement if I have any other object on

Re: [osg-users] Intersect.

Danny Lesnik wrote: Thank you for your help. I think I understand now what LineSegmentIntersector is doing. What might be the correct approach to test wether bounding sphere intrsect with any other project? That depends on how coarse/precise you want the intersections to be. Testing

Re: [osg-users] Intersect.

For example, GIMPACT GIMPACT - very slow use BULLET physic + convex decomposition (BULLET example) 2009/8/25 Paul Melis p...@science.uva.nl Danny Lesnik wrote: Thank you for your help. I think I understand now what LineSegmentIntersector is doing. What might be the correct approach to test

Re: [osg-users] Intersect objects

On Fri, Aug 15, 2008 at 9:25 AM, Victor Hurdugaci [EMAIL PROTECTED] wrote: Hello everyone, I have two geodes and I want to intersect them in order to obtain another object. Something like in 3dsmax – Boolean operations. So I need to keep from two objects only the part that is common. Any

Re: [osg-users] Intersect objects

-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Osfield Sent: Friday, August 15, 2008 4:56 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Intersect objects On Fri, Aug 15, 2008 at 9:25 AM, Victor Hurdugaci [EMAIL PROTECTED] wrote: Hello

Re: [osg-users] intersect() methods in LineSegment (probably others)

Thanks! Hopefully Robert can give it a look when he gets back. thanks, andy -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jean-Sébastien Guay Sent: Tuesday, February 12, 2008 9:21 AM To: OpenSceneGraph Users Subject: Re: [osg-users] intersect

Re: [osg-users] intersect() methods in LineSegment (probably others)

Hi Andy, J-S, did you get to do any timing with my proposed use of doubles in the intersection code? I did some tests last night. Full results below. The executive summary is this: For 2,244,800 samples (individual ray tests), Floats: 113.121566 seconds (original) Doubles: 113.954178

Re: [osg-users] intersect() methods in LineSegment (probably others)

Hello Andy, J-S, did you get to do any timing with my proposed use of doubles in the intersection code? Sorry, I was out of town finally this weekend. I will try it out tonight. J-S -- __ Jean-Sebastien Guay[EMAIL PROTECTED]

Re: [osg-users] intersect() methods in LineSegment (probably others)

J-S, did you get to do any timing with my proposed use of doubles in the intersection code? Thanks, andy ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org

Re: [osg-users] intersect() methods in LineSegment (probably others)

Hello Andy, I've submitted a change to the submission list. Please take a look and tell me if and how much it affects timing. Great, I'll try and check it out tonight and get back to you. J-S -- __ Jean-Sebastien Guay[EMAIL

Re: [osg-users] intersect() methods in LineSegment (probably others)

I got the LineSegment::intersect() method to work when I converted the vectors you get from finding the difference between the start and the sphere center, and the difference between the start and the end, to Vec3d. You want the dot product to be in doubles. In my version, I get the difference

Re: [osg-users] intersect() methods in LineSegment (probably others)

Hello Andy, So is anyone counting on this being floats for performance? Would anyone else welcome this calculation in doubles? If you submit a patch, I can test it out in my Masters project which uses LineSegmentIntersector pretty heavily (not-quite-realtime raytracing :-) ) so that will

Re: [osg-users] intersect() methods in LineSegment (probably others)

Hi Andy, I feel open to change to double if we are working with double precision as internal representation. Or if we have double precsion in bounding sphere. For all care about performance, i don't be sure this change will become much slower as it is for the moment. But of course double is not

Re: [osg-users] intersect() methods in LineSegment (probably others)

: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jean-Sébastien Guay Sent: Wednesday, February 06, 2008 9:52 AM To: OpenSceneGraph Users Subject: Re: [osg-users] intersect() methods in LineSegment (probably others) Hello Andy, So is anyone counting on this being floats for performance

Re: [osg-users] intersect() methods in LineSegment (probably others)

To: OpenSceneGraph Users Subject: Re: [osg-users] intersect() methods in LineSegment (probably others) Hello Andy, So is anyone counting on this being floats for performance? Would anyone else welcome this calculation in doubles? If you submit a patch, I can test it out in my Masters project

Re: [osg-users] intersect() methods in LineSegment (probably others)

Hi Andy, In your work, could you give me an idea of how often you intersect with a particular line segment object? I'm trying to decide if it is worth it to keep a Vec3d in the class (marking whether it is valid), or keeping double versions of _s and _e. In general terms, my program

Re: [osg-users] intersect() methods in LineSegment (probably others)

:-) only the first version of my kd.tree. latest i still extermly slow with about 700K-800K intersection test per second. there are latest kd-Tree ray check with more than ++ 6M rays per second. www.ompf.org :-) so if we will have such a datastructure, we can do lot special effects, like global

Re: [osg-users] intersect() methods in LineSegment (probably others)

Hello Adrian, :-) only the first version of my kd.tree. latest i still extermly slow with about 700K-800K intersection test per second. there are latest kd-Tree ray check with more than ++ 6M rays per second. www.ompf.org http://www.ompf.org :-) Don't take it personally, I didn't mean

Re: [osg-users] intersect() methods in LineSegment (probably others)

:-) 2008/2/6, Jean-Sébastien Guay [EMAIL PROTECTED]: Hello Adrian, :-) only the first version of my kd.tree. latest i still extermly slow with about 700K-800K intersection test per second. there are latest kd-Tree ray check with more than ++ 6M rays per second. www.ompf.org

Re: [osg-users] intersect() methods in LineSegment (probably others)

To: OpenSceneGraph Users Subject: Re: [osg-users] intersect() methods in LineSegment (probably others) Hello Adrian, :-) only the first version of my kd.tree. latest i still extermly slow with about 700K-800K intersection test per second. there are latest kd-Tree ray check with more than ++ 6M rays per