[osg-users] Clip plane with osg::ClipNode

[Catalin]

Hi,

I have an issue with clipping planes, if you set 2 different clipping
planes to 2 different objects, only the last clipping plane is used. I was
expecting each object to be drawn with its clipping plane.

osg::ref_ptr<osg::ClipNode> clipNode1 = new osg::ClipNode;
clipNode1->addClipPlane(new osg::ClipPlane(0));
clipNode1->getClipPlane(0)->setClipPlane(1.0, 0.0, 0.0, -2000.0);

osg::ref_ptr<osg::ClipNode> clipNode2 = new osg::ClipNode;
clipNode2->addClipPlane(new osg::ClipPlane(0));
clipNode2->getClipPlane(0)->setClipPlane(-1.0, 0.0, 0.0, -2000.0);

osg::ShapeDrawable* s1 = new osg::ShapeDrawable(new
osg::Box(osg::Vec3(2000, 0, 0), 500));
clipNode1->addChild(s1);
osg::ShapeDrawable* s2 = new osg::ShapeDrawable(new
osg::Box(osg::Vec3(-2000, 0, 0), 500));
clipNode2->addChild(s2);

Every box is shown in half because of the clipping plane.

*Case 1*
root->addChild(clipNode1);
//root->addChild(clipNode2);

[image: image.png]

*Case 2*
//root->addChild(clipNode1);
root->addChild(clipNode2);

[image: image.png]

*Case 3*
root->addChild(clipNode1);
root->addChild(clipNode2);

[image: image.png]

I was expecting both boxes, S1 and S2 to be drawn.
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