From Ulrich Hertlein, "attached is a stencil buffer-based constant-width outline f/x with example. I've also modified osgfxbrowser to setup the stencil buffer accordingly."
Robert Osfield
15 years ago
parent
17b8ee1508
commit
e0154c2d28
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#this file is automatically generated
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SET(TARGET_SRC osgoutline.cpp )
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SET(TARGET_ADDED_LIBRARIES osgFX osgGA )
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#### end var setup ###
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SETUP_EXAMPLE(osgoutline)
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// -*-c++-*-
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/*
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* Draw an outline around a model.
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*/
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#include <osg/Group>
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#include <osgDB/ReadFile>
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#include <osgViewer/Viewer>
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#include <osgFX/Outline>
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int main(int argc, char** argv)
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{
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osg::ArgumentParser arguments(&argc,argv);
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] <file>");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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// create outline effect
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osg::ref_ptr<osgFX::Outline> outline = new osgFX::Outline;
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outline->setWidth(8);
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outline->setColor(osg::Vec4(1,1,0,1));
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// create scene
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osg::ref_ptr<osg::Group> root = new osg::Group;
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root->addChild(outline);
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osg::ref_ptr<osg::Node> model0 = osgDB::readNodeFile(arguments.argc() > 1 ? arguments[1] : "al.obj");
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outline->addChild(model0);
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// must have stencil buffer...
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osg::DisplaySettings::instance()->setMinimumNumStencilBits(1);
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// construct the viewer
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osgViewer::Viewer viewer;
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viewer.setSceneData(root);
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// must clear stencil buffer...
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unsigned int clearMask = viewer.getCamera()->getClearMask();
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viewer.getCamera()->setClearMask(clearMask | GL_STENCIL_BUFFER_BIT);
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viewer.getCamera()->setClearStencil(0);
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return viewer.run();
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}
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// -*-c++-*-
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/*
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* OpenSceneGraph - Copyright (C) 1998-2009 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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/*
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* osgFX::Outline - Copyright (C) 2004,2009 Ulrich Hertlein
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*/
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#ifndef OSGFX_OUTLINE_
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#define OSGFX_OUTLINE_
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#include <osgFX/Export>
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#include <osgFX/Effect>
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namespace osgFX
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{
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/**
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* Outline effect.
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* This effect draws a stencil buffer-based outline around an object.
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* Color and width of the outline can be modified.
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* To function correctly the context must be setup with a stencil buffer
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* and the stencil buffer must be cleared to zero before each render.
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*
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* osg::DisplaySettings::instance()->setMinimumNumStencilBits(1);
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* camera->setClearMask(clearMask | GL_STENCIL_BUFFER_BIT);
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* camera->setClearStencil(0);
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*/
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class Outline : public Effect
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{
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public:
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/// Constructor.
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Outline();
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/// Copy constructor.
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Outline(const Outline& copy, const osg::CopyOp& op = osg::CopyOp::SHALLOW_COPY) : Effect(copy, op) {
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_width = copy._width;
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_color = copy._color;
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_technique = copy._technique;
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}
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// Effect class info
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META_Effect(osgFX, Outline, "Outline",
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"Stencil buffer based object outline effect.\n"
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"This effect needs a properly setup stencil buffer.",
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"Ulrich Hertlein <u.hertlein@sandbox.de>");
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/// Set outline width.
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void setWidth(float w);
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/// Get outline width.
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float getWidth() const {
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return _width;
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}
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/// Set outline color.
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void setColor(const osg::Vec4& color);
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/// Get outline color.
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const osg::Vec4& getColor() const {
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return _color;
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}
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protected:
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/// Destructor.
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virtual ~Outline() {
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}
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/// Define available techniques.
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bool define_techniques();
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private:
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/// Outline width.
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float _width;
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/// Outline color.
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osg::Vec4 _color;
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/// Technique.
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class OutlineTechnique;
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OutlineTechnique* _technique;
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};
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}
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#endif
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@ -0,0 +1,196 @@
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// -*-c++-*-
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/*
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* OpenSceneGraph - Copyright (C) 1998-2009 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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/*
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* osgFX::Outline - Copyright (C) 2004,2009 Ulrich Hertlein
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*/
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#include <osgFX/Outline>
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#include <osgFX/Registry>
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#include <osg/Group>
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#include <osg/Stencil>
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#include <osg/CullFace>
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#include <osg/PolygonMode>
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#include <osg/LineWidth>
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#include <osg/Material>
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namespace {
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const unsigned int Override_On = osg::StateAttribute::ON|osg::StateAttribute::OVERRIDE;
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const unsigned int Override_Off = osg::StateAttribute::OFF|osg::StateAttribute::OVERRIDE;
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}
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namespace osgFX
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{
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/// Register prototype.
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Registry::Proxy proxy(new Outline);
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/**
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* Outline technique.
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*/
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class Outline::OutlineTechnique : public Technique
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{
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public:
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/// Constructor.
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OutlineTechnique() : Technique(),
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_lineWidth(), _width(2),
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_material(), _color(1,1,1,1) {
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}
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/// Validate.
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bool validate(osg::State&) const {
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return true;
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}
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/// Set outline width.
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void setWidth(float w) {
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_width = w;
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if (_lineWidth.valid()) {
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_lineWidth->setWidth(w);
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}
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}
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/// Set outline color.
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void setColor(const osg::Vec4& color) {
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_color = color;
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if (_material.valid()) {
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const osg::Material::Face face = osg::Material::FRONT_AND_BACK;
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_material->setAmbient(face, color);
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_material->setDiffuse(face, color);
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_material->setEmission(face, color);
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}
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}
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protected:
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/// Define render passes.
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void define_passes() {
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/*
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* draw
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* - set stencil buffer to ref=1 where draw occurs
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* - clear stencil buffer to 0 where test fails
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*/
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{
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osg::StateSet* state = new osg::StateSet;
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// stencil op
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osg::Stencil* stencil = new osg::Stencil;
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stencil->setFunction(osg::Stencil::ALWAYS, 1, ~0);
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stencil->setOperation(osg::Stencil::KEEP,
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osg::Stencil::KEEP,
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osg::Stencil::REPLACE);
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state->setAttributeAndModes(stencil, Override_On);
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addPass(state);
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}
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/*
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* post-draw
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* - only draw where draw didn't set the stencil buffer
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* - draw only back-facing polygons
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* - draw back-facing polys as lines
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* - disable depth-test, lighting & texture
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*/
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{
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osg::StateSet* state = new osg::StateSet;
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// stencil op
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osg::Stencil* stencil = new osg::Stencil;
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stencil->setFunction(osg::Stencil::NOTEQUAL, 1, ~0);
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stencil->setOperation(osg::Stencil::KEEP,
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osg::Stencil::KEEP,
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osg::Stencil::REPLACE);
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state->setAttributeAndModes(stencil, Override_On);
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// cull front-facing polys
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osg::CullFace* cf = new osg::CullFace;
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cf->setMode(osg::CullFace::FRONT);
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state->setAttributeAndModes(cf, Override_On);
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// draw back-facing polygon lines
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osg::PolygonMode* pm = new osg::PolygonMode;
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pm->setMode(osg::PolygonMode::BACK, osg::PolygonMode::LINE);
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state->setAttributeAndModes(pm, Override_On);
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// outline width
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_lineWidth = new osg::LineWidth;
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setWidth(_width);
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state->setAttributeAndModes(_lineWidth, Override_On);
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// outline color/material
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_material = new osg::Material;
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_material->setColorMode(osg::Material::AMBIENT_AND_DIFFUSE);
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setColor(_color);
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state->setAttributeAndModes(_material, Override_On);
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// disable modes
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state->setMode(GL_BLEND, Override_Off);
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state->setMode(GL_DEPTH_TEST, Override_Off);
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state->setTextureMode(0, GL_TEXTURE_1D, Override_Off);
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state->setTextureMode(0, GL_TEXTURE_2D, Override_Off);
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state->setTextureMode(0, GL_TEXTURE_3D, Override_Off);
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addPass(state);
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}
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}
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private:
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/// Outline width.
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osg::ref_ptr<osg::LineWidth> _lineWidth;
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float _width;
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/// Outline Material.
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osg::ref_ptr<osg::Material> _material;
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osg::Vec4 _color;
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};
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/**
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* Outline effect.
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*/
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Outline::Outline() : Effect(), _width(2), _color(1,1,1,1), _technique(0)
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{
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}
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void Outline::setWidth(float w)
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{
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_width = w;
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if (_technique) {
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_technique->setWidth(w);
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}
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}
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void Outline::setColor(const osg::Vec4& color)
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{
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_color = color;
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if (_technique) {
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_technique->setColor(color);
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}
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}
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bool Outline::define_techniques()
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{
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_technique = new OutlineTechnique;
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addTechnique(_technique);
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setWidth(_width);
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setColor(_color);
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return true;
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}
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};
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