Re: [osg-users] Support becoming less and less personal
Hi, > Robert Osfield: > Sorry but this statement about "old school" is just plain obnoxious. > Please refrain from using such bigoted none-sense on either the list > or forum. > You might find it offensive but its reality - people of younger generation grew up with forums and not mailing lists. That doesnt mean one medium is better than the other, just that peoples usage patterns have changed. > Paul Speed: > We could probably short-circuit a lot just be splitting into two groups and > calling one "experts" and the other "beginners"... and no one would have to > bother joining the second one. ;) g I hope not. I would have given up on OSG if noobs like me were assigned to a ghetto forum. Regards, Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11675#11675 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] animating textures
hi, > I added them just as convenience for quickly visualizing the shape > primitives, without any intention of it being widely used. thats interesting to know. OK I will try to stay away from them until they are refactored. I found that like with lights there is an OpenGL limit on the maximum number of textures (GL_MAX_TEXTURE_UNITS_ARB), which can be quite small on some platforms. How do people deal with this limitation? Because Ive used OpenGL based CAD programs that let me load as many textures as I want. Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=10384#10384 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Desirable OpenGL knowledge
hi all, Ive had a few struggles with OSG recently (lighting, textures, transparency, ...) due in part to my lack of understanding about the OpenGL base. I have a few days over Easter I want to devote to getting on top of OpenGL, with the specific aim of debugging this effect (http://forum.openscenegraph.org/viewtopic.php?p=9259). How do you recommend I go about this, keeping in mind that I dont plan to develop with raw OpenGL? Im particularly interested in how the OpenGL states and modes effect the rendering in OSG. So, the Red Book (http://www.amazon.com/OpenGL-Programming-Guide-Official-Learning/dp/0321481003)? The SuperBible (http://www.amazon.com/OpenGL-SuperBible-Comprehensive-Tutorial-Reference/dp/0321498828)? The online documentation (http://www.opengl.org/documentation/)? I would really appreciate any advices before diving in, Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9950#9950 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] animating textures
> Is your drawable a ShapeDrawable? Then you're pretty much out of luck, > because these only set texture coordinates on unit 0 and don't give you > access to their internals. thanks Skylark! - that would explain the different results Im getting for unit 0 and 1 with a ShapeDrawable. Ive now changed to a model derived from osg::Geometry and the texture animation is working fine. Those ShapeDrawable classes seem limiting ... is there a goal to derive them from osg::Geometry rather than the current raw OpenGL calls? Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9949#9949 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] animating textures
hi Robert, so if all textures are disabled initially is there any difference between textures 0 and 1? Because the exact same code works for texture 0 but not texture 1. I saw in the archives a snippet (http://groups.google.com/group/osg-users/browse_thread/thread/616a24590cce9c3) where the texture coordinates were set manually like this: Code: geometry->setTexCoordArray(1, geometry->getTexCoordArray(0)); I cant do this because my drawable does not inherit from osg::Geometry, but is something manual like this needed for non-zero textures? > Most likely the problems you are seeing are related to not setting up the > scene graph appropriately What kind of settings can effect whether a texture is displayed? Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9911#9911 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] animating textures
Hi, thanks very much for the advices.
I now have a basic MultitextureControl example working that fades a single
texture.
However I cant seem to activate texture unit 1. The following example only
shows the texture if I set unit to 0:
Code:
addDrawable(new osg::ShapeDrawable(new osg::Cone()));
texture = new osg::Texture2D;
texture->setImage(osgDB::readImageFile("brick1.TGA"));
int unit = 1; // works fine when unit=0
getOrCreateStateSet()->setTextureAttributeAndModes(unit, texture);
Like lights, is only texture 0 activated by default? Am I missing something to
activate the texture?
> The other way to do it is use a 3D texture and then vary the r coord. See
> the osgtexture3D example for an example of this.
>
hi Robert: is there an advantage to this technique or has it been obsoleted by
MultitextureControl?
Julia
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Re: [osg-users] animating textures
ah - I should have been more specific with what I meant by animation. I want to fade between two textures so that the previous texture slowly gets weaker while the new texture slowly gets stronger. Can shaders manipulate the texture opacity? (I expect so.) And do you think this is a better approach than what OSG provides with the MultiTextureControl? Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9766#9766 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] animating textures
Hi, I am trying to animate a transition between textures on a surface. I had a look in osgAnimation (http://www.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a01556.html) but that namespace seems to be just related to geometry. I found osgFX::MultiTextureControl (http://www.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a00429.html), which can control which textures are active and how to blend them, but doesnt support animating. So to animate between textures should I create a callback to update the texture control (like the rotate example in the manual)? Or is there a better approach? Thank you. Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9763#9763 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgmultitexturecontrol example data base?
hi, Im also trying to run the example. Is the example data ready? Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9762#9762 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Disabling node
> I know that usually my suggestions for your problems doesn't work Your advice was definitely helpful! :) I followed your first suggested solution and now I can switch between manipulators on the fly - thanks! With blurring Im not sure, the model edges seem to be more anti aliased but the internal skeleton shows through so it does not look good right now... Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9471#9471 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Disabling node
Hi, how can I disable a node so that it is not rendered but it's children are still rendered? I had a look at setting the node mask but that effects children too. My specific problem is I am using an osgManipulator dragger and want to be able to toggle on/off its geometry but maintain its transformation on any children. Thank you. Julia (I asked a similar but more general question (http://forum.openscenegraph.org/viewtopic.php?p=9339) last week but didn't manage to attract a response. So I'm hoping this more specific question gets feedback.) -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9432#9432 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] importing shaders
hi, That is encouraging to know OSG supports shaders natively (now I saw the shader examples). I have got the 3DS exporter working now. > Out of 133 examples I can only find 6 that use CompositeViewer at all Just 6/133 - I take that criticism back then! Many of the examples I looked at coincidentally supported a composite view. Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9340#9340 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] manipulator design advice
instead of inserting and removing the draggers would a better solution be to use the dragger node masks to select which is visible? Then I could have dragger 1 at root, dragger N a child of dragger N-1, and then the model a child of dragger N. Would you recommended this solution? A followon question: if a nodes mask is cleared so it is not rendered, can it still be intersected? (I hope not) Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9339#9339 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] manipulator design advice
Hi, I am using the osgManipulator draggers to move objects around my scene. I intend that when the R key is pressed a rotation dragger is used and when the T key is pressed a translation dragger is used. And if any other key is pressed then no draggers are used. The manipulator example applies the draggers from the start and so doesnt face this problem. What is a good way to arrange my scene nodes so that I can switch between drag modes? Originally I thought of using a switch node, but then only 1 transformation at a time would be applied to the model (is that right?) and I want the transformations to be maintained across modes. I could stack the manipulators on top of each other, but then their geometry (created with setupDefaultGeometry()) would overlap. (The API doesnt support disabling a dragger.) My current design is: - put the model behind a transform - when switch mode apply current dragger matrix to the transform and then remove dragger - insert new dragger before the transform This seems very awkward so Im hoping there is a better way! Thank you. Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9260#9260 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] bluring model edges
oh really so it is meant to just effect the edges? That is great to know that this functionality is supported. I wonder why it causes the skeleton of the model to show through (see attached screenshot for what Im talking about) I am not very familiar with the OpenGL state settings - do you know of any potentially relevant settings that might help? Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9259#9259 <>___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] bluring model edges
hi Guy, I tried this code and didn't notice any blurring, although for some reason the skeleton in my models became exposed (the same effect as the osgscribe example). If I understand right this example is meant to blur the entire model - is that right? Because I just want to blur the model edges while keeping the rest of the model clear. Is there a way to do that? thanks for the example, Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9048#9048 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] bluring model edges
Hi, Is it possible to blur the edges of a model in OSG with whatever is behind? Currently the edges of the models in my scene are too sharp and would look better if there was a translucent overlap at the edges. Is this possible to achieve in OSG, or is this kind of functionality more relevant to OpenGL? Thank you, Julia -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=8918#8918 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] importing shaders
I have a model made in 3DS with textures and shaders and I would like to use it within OSG. When I try displaying it with osgviewer.exe the textures are rendered but not the shaders. I know shaders are algorithms, so perhaps they are not exported with the model. Or 3DS may be using a DirectX shader while OSG is OpenGL based. Am I on the right track?? Is there a way to design models with shaders and import them into OSG? Or do I need to manually attach my shaders with osg::Shader (which would make models harder to design)? Julia (P.S. - in learning OSG I found the examples extremely useful, but I feel many have been over engineered so that they obscure their purpose. For instance many of the examples have a flag to use a Composite Viewer instead of the default Viewer. I think it would be ideal for beginners if the examples were stripped down to focus on their core functionality.) -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=8134#8134 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
