Hello OSG users,
i'm trying to render a water surface with reflections. Rendering the
reflected scene into a texture and projecting it on a water plane
already works.
What i need is a clipplane at water height to avoid rendering anything
below the water surface. I've tried to setup a ClipNode with clipplanes
in various ways (also activating them on different positions at the
scenegraph) but nothing gets clipped.
I post a code snippet below, perhaps i'm missing something obvious. I
tried, setting up the ClipNode at root level and activating the plane at
reflection cameras level. Tried adding the ClipNode above the reflection
camera and activating it there. And below is the code, where the
ClipNode is child of the RTT reflection_camera, but it doesn't work either.
snippet:
//---------------- reflection texture ------------
reflection_tex_ = new osg::Texture2D;
reflection_tex_->setTextureSize(1024,1024);
reflection_tex_->setInternalFormat(GL_RGBA);
reflection_tex_->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
reflection_tex_->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
reflection_tex_->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_BORDER);
reflection_tex_->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_BORDER);
reflection_tex_->setBorderColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
//------------ reflection camera ----------------------
reflection_camera_ = new osg::Camera;
reflection_camera_->setName("WaterReflectionCamera");
reflection_camera_->setClearColor(osg::Vec4(0.1f,0.1f,0.3f,1.0f));
reflection_camera_->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
reflection_camera_->setComputeNearFarMode(osg::Camera::DO_NOT_COMPUTE_NEAR_FAR);
reflection_camera_->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
reflection_camera_->setViewport(0, 0,
reflection_tex_->getTextureWidth(),
reflection_tex_->getTextureHeight());
reflection_camera_->setRenderOrder(osg::Camera::PRE_RENDER);
reflection_camera_->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
reflection_camera_->attach(osg::Camera::COLOR_BUFFER,
reflection_tex_.get());
// add clip node with clip plane, to avoid rendering anything below
water surface
osg::ClipNode * clip_node = new osg::ClipNode();
clip_node->setName("Clip Node XZ plane");
clip_node->addClipPlane(new osg::ClipPlane(0,0.0,1.0,0.0,water_height));
osg::StateSet* clip_state = clip_node->getOrCreateStateSet();
clip_state->setMode(GL_CLIP_PLANE0, osg::StateAttribute::PROTECTED |
osg::StateAttribute::ON);
clip_node->addChild(reflected_nodes.get());
reflection_camera_->addChild(clip_node);
root_node->addChild(reflection_camera_.get());
//-----------------------
Thanks in advance for any help,
Michael.
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