Re: [osg-users] Problem setting a skydome
Hi David, El Miércoles 16 Julio 2008ES 21:41:49 David Spilling escribió: Alberto, I presume that your skydome has some sort of camera centred transform over it (as per osghangglide's example use); your code doesn't show it. I haven't coded it yet, I wanted to have the near/far issue fixed first. osg::ClearNode* clearNode = new osg::ClearNode; clearNode-setRequiresClear(false); This is odd. If your camera is the first thing to draw (implied by PRE_RENDER) then something needs to be clearing the colour and depth buffer. In any case, you can use camera's setClearMask method to control this without needing a clearNode. For example camera-setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT) clears everyhing, setClearMask(0) clears nothing. Yes, you are right. osg::TexEnv* te = new osg::TexEnv; te-setMode(osg::TexEnv::REPLACE); stateset-setTextureAttributeAndModes(0, te, osg::StateAttribute::ON); Slightly surprised to see this, but if your skydome needs it, then OK. Well, I wanted to display texture real colour, not modified by any lighting calculation. stateset-setMode( GL_CULL_FACE, osg::StateAttribute::ON ); osg::Depth* depth = new osg::Depth; depth-setFunction(osg::Depth::ALWAYS); depth-setRange(1.0,1.0); stateset-setAttributeAndModes(depth, osg::StateAttribute::ON ); Again, not wrong (as the depth testing is always passed) but not really necessary, as you are ensuring that your skydome is drawn first. I would tend to prevent depth writing with osg::Depth* depth = new osg::Depth; depth-setWriteMask(false); // don't bother writing the depth buffer stateset-setAttributeAndModes(depth, osg::StateAttribute::ON ); and also disable depth testing with stateSet-setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF) Yes, I have deleted that block. Finally and thanks to your valuable help, I have managed to get it working. Somehow I were mismatching ClearMask with ColorMask when I eliminated the ClearNode. Now I have the pre-render slave camera, which has its own near/far planes and then the real scene is rendered over it: //Paint over the skydome viewer.getCamera()-setClearMask(GL_DEPTH_BUFFER_BIT); //Create the pre-render skydome camera osg::Camera *camara = new osg::Camera; camera-addChild(skydome.get()); camera-setRenderOrder(osg::Camera::PRE_RENDER); camera-setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); SceneRoot-addChild(camera); osg::StateSet* stateset = n-getOrCreateStateSet(); osg::TexEnv* te = new osg::TexEnv; te-setMode(osg::TexEnv::REPLACE); stateset-setTextureAttributeAndModes(0, te, osg::StateAttribute::ON); stateset-setMode( GL_LIGHTING, osg::StateAttribute::OFF ); stateset-setMode( GL_CULL_FACE, osg::StateAttribute::ON ); Again, thank you very much for your advice :) Regards, Alberto ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem setting a skydome
David, thank you very much for your help so far. What you say sounds sensible, however I think my implementation still has bugs, because it behaves differently on several computers (one works, the other don't). What I have so far is: // root - camera - clearnode - skydome // |-- rest_of_scene osg::Camera *camera = new osg::Camera; osg::ClearNode* clearNode = new osg::ClearNode; clearNode-setRequiresClear(false); clearNode-addChild(SkydomeSubgraphNode.get()); camera-setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR); camera-addChild(clearNode); camera-setRenderOrder(osg::Camera::PRE_RENDER); root-addChild(camera); osg::StateSet* stateset = SkydomeSubgraphNode-getOrCreateStateSet(); osg::TexEnv* te = new osg::TexEnv; te-setMode(osg::TexEnv::REPLACE); stateset-setTextureAttributeAndModes(0, te, osg::StateAttribute::ON); stateset-setMode( GL_LIGHTING, osg::StateAttribute::OFF ); stateset-setMode( GL_CULL_FACE, osg::StateAttribute::ON ); osg::Depth* depth = new osg::Depth; depth-setFunction(osg::Depth::ALWAYS); depth-setRange(1.0,1.0); stateset-setAttributeAndModes(depth, osg::StateAttribute::ON ); does something look weird to you? Thank you, Alberto El Martes 15 Julio 2008ES 10:32:55 David Spilling escribió: Alberto, skydome-setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR ). a class osg::Camera inherits from Sorry - missed a step. Put a Camera in above your skydome. A solution that comes to my mind is to use a pair of cameras, one rendering the skydome with the setting you said, DO_NOT_COMPUTE_NEAR_FAR, and the other rendering the rest of the scene. Exactly. That's what I do (although I control a bunch of other stuff in the camera, like projection matrix, in order to avoid the later issues). David ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem setting a skydome
Alberto, I presume that your skydome has some sort of camera centred transform over it (as per osghangglide's example use); your code doesn't show it. osg::ClearNode* clearNode = new osg::ClearNode; clearNode-setRequiresClear(false); This is odd. If your camera is the first thing to draw (implied by PRE_RENDER) then something needs to be clearing the colour and depth buffer. In any case, you can use camera's setClearMask method to control this without needing a clearNode. For example camera-setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT) clears everyhing, setClearMask(0) clears nothing. osg::TexEnv* te = new osg::TexEnv; te-setMode(osg::TexEnv::REPLACE); stateset-setTextureAttributeAndModes(0, te, osg::StateAttribute::ON); Slightly surprised to see this, but if your skydome needs it, then OK. stateset-setMode( GL_CULL_FACE, osg::StateAttribute::ON ); osg::Depth* depth = new osg::Depth; depth-setFunction(osg::Depth::ALWAYS); depth-setRange(1.0,1.0); stateset-setAttributeAndModes(depth, osg::StateAttribute::ON ); Again, not wrong (as the depth testing is always passed) but not really necessary, as you are ensuring that your skydome is drawn first. I would tend to prevent depth writing with osg::Depth* depth = new osg::Depth; depth-setWriteMask(false); // don't bother writing the depth buffer stateset-setAttributeAndModes(depth, osg::StateAttribute::ON ); and also disable depth testing with stateSet-setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF) I looked at my code and noticed that I also do camera-setCullingMode(osg::CullSettings::NO_CULLING), but can't remember at the moment whether it's relevant. Lastly, what OSG version are you using? Hope that helps, David ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem setting a skydome
Alberto, skydome-setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR). a class osg::Camera inherits from Sorry - missed a step. Put a Camera in above your skydome. A solution that comes to my mind is to use a pair of cameras, one rendering the skydome with the setting you said, DO_NOT_COMPUTE_NEAR_FAR, and the other rendering the rest of the scene. Exactly. That's what I do (although I control a bunch of other stuff in the camera, like projection matrix, in order to avoid the later issues). David ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem setting a skydome
David, I appreciate your help a lot. However I have found a few problems: El Domingo 13 Julio 2008ES 21:22:33 David Spilling escribió: Firstly, you need to prevent the CullVisitor from considering your skydome in it's autonear/far calculation. You can do this with skydome-setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR). I couldn't find any setComputeNearFarMode mode in osg::Node. I only found it in osg::CullSettings, a class that osg::Camera inherits from, so I'm unable to easily make OSG skip a certain node from the automatic near/far computation. Either I use it with all the scene or I disable it completely with DO_NOT_COMPUTE_NEAR_FAR. I kept investigating and found that the code snippet I was perusing, the createSkyBox function at osgvertexprogram.cpp wasn't working at all. When I pasted that function directly into my program, the near clipping was still present. I think that the similar sizes of the osgvertexprogram.cpp program made that this behaviour went undetected for the example. A solution that comes to my mind is to use a pair of cameras, one rendering the skydome with the setting you said, DO_NOT_COMPUTE_NEAR_FAR, and the other rendering the rest of the scene. However, I think having a pair of cameras just to skip the culling process for a node could be an overkill. Doesn't osg::Node::setCullingActive exists for this very reason? Regards, Alberto ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem setting a skydome
Alberto, Firstly, you need to prevent the CullVisitor from considering your skydome in it's autonear/far calculation. You can do this with skydome-setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR). You will also need to mimic being a long way away via, most simply by drawing first (e.g. via a pre draw camera, or good control of your render bins) with depth checking/writing disabled. If you have expensive shaders on your skydome, you might want to draw last to z depth = 1 (via stateset-setAttributeAndModes(new osg::Depth(osg::Depth::ALWAYS, 1.0,1.0))). NB - you might need LEQUAL, depending on how you cleared your zbuffer. Depending on what you are dong, you might still also run into a problem in which your skydome is clipped, so you'll need to control the projective camera; look at the DepthPartition example if you need a way forward. Hope that helps, David ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Problem setting a skydome
Hello,
I'm having trouble setting a skydome into my scene. It is messing with the
autocomputed near and far planes (the near plane goes too far, cutting near
objects). In order to avoid it, I tried to disable culling for its subgraph
and even giving it a ComputeBoundingSphereCallback that only generates
invalid boundingSpheres, but the problem stays. Any ideas?
My invalid bounds generator:
class invalidBoundsCallback: public osg::Node::ComputeBoundingSphereCallback{
public:
osg::BoundingSphere computeBound (const osg::Node ) const
{
return osg::BoundingSphere();
}
};
Setting of the subgraph containing the skydome (group-SkynodeGeode):
osg::ref_ptrosg::Node n = osgDB::readNodeFile( skydome);
n-setCullingActive(false);
n-setComputeBoundingSphereCallback(new invalidBoundsCallback);
Alberto
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