Re: [osg-users] Setting BoundingBox
Ulrich Hertlein wrote: > Renan Mendes wrote: >> what I mean with that. A snap is basically a sudden transformation of >> the shape on the screen to a certain orientation and position in space > > Sorry, missed that the first time. > As I understand it you want to scale the Drawable to a given size, place it > in a > certain position? Sorry, I just now got what you're trying. Ignore my previous post, Brian's approach (ComputeBoundingBoxCallback) is what you want. /ulrich ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Setting BoundingBox
Hi Renan, Renan Mendes wrote: > what I mean with that. A snap is basically a sudden transformation of > the shape on the screen to a certain orientation and position in space Sorry, missed that the first time. As I understand it you want to scale the Drawable to a given size, place it in a certain position? To change the position, scale/size, or orientation of a Geode you should place a MatrixTransform above that node and set its matrix to do what you want. (To change the size of a single Drawable you'd have to modify it's coordinates directly.) E.g. say you want to change to Geode to a certain size you could do the following: // node hierarchy is xform=MatrixTransform -> Geode -> drawable=Drawable // desired size osg::Vec3 dSize(100,100,100); // get current bounding box const osg::BoundingBox& bbox = drawable.getBound(); osg::Vec3 bboxSize = (bbox._max - bbox._min); xform->setMatrix(osg::Matrix::scale(bboxSize.x() / dSize.x(), bboxSize.y() / dSize.y(), bboxSize.z() / dSize.z())); This is from memory, so it may not work out of the box. /ulrich ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Setting BoundingBox
Hi, Ulrich. This is what I've said in my first email: "I am currently trying to implement 'snaps' in my application. I don't know if that's the standard nomenclature, so I'll explain briefly what I mean with that. A snap is basically a sudden transformation of the shape on the screen to a certain orientation and position in space when it reaches a certain state in the scene. For example, when a point gets close to a plane, it gets translated to its projection on the plane [...]" What I thought was that the function intersects() would give me a 'warning' when two shapes got close enough. That's what I've thought when I decided to use BoundingBox. Is there a better way to do that? Thanks for your help, Ulrich. Renan M Z Mendes ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Setting BoundingBox
To change the drawable bounding box you either need to change the actual geometry, or you need to add a callback to override the computebound method behavior. Search the osg code for ComputeBoundingBoxCallback. Brian [EMAIL PROTECTED] wrote: - To: OpenSceneGraph Users From: Ulrich Hertlein <[EMAIL PROTECTED]> Sent by: [EMAIL PROTECTED] Date: 02/22/2008 11:48PM Subject: Re: [osg-users] Setting BoundingBox Renan Mendes wrote: >"2 overloads have no legal conversion for 'this' pointer" > ... > (drawable->getBound()).set(-COMPRIMENTO - 0.1, -LARGURA - 0.1, > -ESPESSURA - 0.1, > COMPRIMENTO + 0.1, LARGURA + > 0.1, ESPESSURA + 0.1); // constants in capital letters > > Anyone could explain to me what's happening? The osg::Drawable::getBound() is const, so you cannot modify the bounding box returned to you. What are you trying to achieve? Maybe you're using the bounding box for something it's not intended to do (or something that's just wrong usage of the API). If you would give some more information it would be easier to solve the problem. Cheers, /ulrich ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Setting BoundingBox
Renan Mendes wrote: >"2 overloads have no legal conversion for 'this' pointer" > ... > (drawable->getBound()).set(-COMPRIMENTO - 0.1, -LARGURA - 0.1, > -ESPESSURA - 0.1, > COMPRIMENTO + 0.1, LARGURA + > 0.1, ESPESSURA + 0.1); // constants in capital letters > > Anyone could explain to me what's happening? The osg::Drawable::getBound() is const, so you cannot modify the bounding box returned to you. What are you trying to achieve? Maybe you're using the bounding box for something it's not intended to do (or something that's just wrong usage of the API). If you would give some more information it would be easier to solve the problem. Cheers, /ulrich ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Setting BoundingBox
Hi, everyone. I am currently trying to implement 'snaps' in my application. I don't know if that's the standard nomenclature, so I'll explain briefly what I mean with that. A snap is basically a sudden transformation of the shape on the screen to a certain orientation and position in space when it reaches a certain state in the scene. For example, when a point gets close to a plane, it gets translated to its projection on the plane, which is exactly what I'm trying to do in my application. For that, I thought of using bounding boxes. But to be able to control the minimum distance in which the bb's will intersect, I must set their extensions. While trying to do that with the function 'set', my compiler accused the following error: "2 overloads have no legal conversion for 'this' pointer" I'll paste the source code I am using: osg::ShapeDrawable* drawable = new osg::ShapeDrawable(new osg::Box(posicao, largura, comprimento, espessura)); // these are the same arguments of the function (drawable->getBound()).set(-COMPRIMENTO - 0.1, -LARGURA - 0.1, -ESPESSURA - 0.1, COMPRIMENTO + 0.1, LARGURA + 0.1, ESPESSURA + 0.1); // constants in capital letters Anyone could explain to me what's happening? Thanks for your help. Renan M Z Mendes ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
